test(mcp): add test foundation for the MCP server (#12291)

2026-10-04 02:04:06 +00:00 · 2026-08-04 16:19:10 +02:00
parent c74eac1369
commit 138d643119
32 changed files with 2332 additions and 22 deletions
@@ -15,6 +15,7 @@ When performing these actions, ALWAYS invoke the corresponding skill FIRST:
 | Review changelog format and conventions | `prowler-changelog` |
 | Update CHANGELOG.md in any component | `prowler-changelog` |
 | Working on MCP server tools | `prowler-mcp` |
+| Writing tests for the MCP server | `prowler-test-mcp` |

 ## Project Overview

@@ -48,9 +49,9 @@ The Prowler MCP Server provides AI agents access to the Prowler ecosystem throug
 ### Three Sub-Servers

 ```python
-await prowler_mcp_server.import_server(hub_mcp_server, prefix="prowler_hub")
-await prowler_mcp_server.import_server(app_mcp_server, prefix="prowler_app")
-await prowler_mcp_server.import_server(docs_mcp_server, prefix="prowler_docs")
+prowler_mcp_server.mount(hub_mcp_server, namespace="prowler_hub")
+prowler_mcp_server.mount(app_mcp_server, namespace="prowler")
+prowler_mcp_server.mount(docs_mcp_server, namespace="prowler_docs")
 ```

 ### Tool Naming
@@ -62,7 +63,7 @@ await prowler_mcp_server.import_server(docs_mcp_server, prefix="prowler_docs")

 ## TECH STACK

-Python 3.12+ | FastMCP 2.13.1 | httpx (async) | Pydantic | uv
+Python 3.12+ | FastMCP 3.4.4 | httpx (async) | Pydantic | uv | pytest

 ---

@@ -85,9 +86,23 @@ mcp_server/prowler_mcp_server/

 ## COMMANDS

+From `mcp_server/`:
+
 ```bash
-cd mcp_server && uv run prowler-mcp                              # STDIO mode
-cd mcp_server && uv run prowler-mcp --transport http --port 8000 # HTTP mode
+cd mcp_server
+
+uv run prowler-mcp                              # STDIO mode
+uv run prowler-mcp --transport http --port 8000 # HTTP mode
+
+uv run pytest                                   # Run the test suite
+uv run pytest tests/prowler_app/models          # Run one area
+uv run pytest --cov=./prowler_mcp_server        # With coverage
+```
+
+From the repository root:
+
+```bash
+make test-mcp   # Run the MCP test suite exactly as CI does
 ```

 ---
@@ -100,3 +115,7 @@ cd mcp_server && uv run prowler-mcp --transport http --port 8000 # HTTP mode
 - [ ] No hardcoded secrets
 - [ ] Error handling returns structured responses
 - [ ] Parameter descriptions use Pydantic `Field()`
+- [ ] Tests added under `mcp_server/tests/`, mirroring the source path below the
+      package root (`prowler_mcp_server/prowler_app/tools/` -> `tests/prowler_app/tools/`),
+      as the SDK does for `prowler/` -> `tests/`
+- [ ] `uv run pytest` passes
@@ -0,0 +1 @@
+Test foundation for the MCP server with shared fixtures, JSON:API builders, mocked HTTP transports and CI coverage reporting
@@ -5,7 +5,11 @@ requires = ["setuptools>=61.0", "wheel"]
 [dependency-groups]
 dev = [
  "bandit==1.8.3",
+  "coverage==7.15.2",
  "pytest==9.0.3",
+  "pytest-asyncio==1.4.0",
+  "pytest-cov==6.0.0",
+  "pytest-env==1.1.5",
  "ruff==0.15.11",
  "vulture==2.14"
 ]
@@ -27,8 +31,32 @@ prowler-mcp = "prowler_mcp_server.main:main"
 [tool.pytest]

 [tool.pytest.ini_options]
+addopts = "--strict-markers --strict-config"
+# `asyncio_mode = "auto"` lets `async def test_*` run without a per-test marker;
+# the server is async end to end, so requiring one would be pure noise. Setting
+# the fixture loop scope explicitly silences a pytest-asyncio deprecation warning.
+asyncio_default_fixture_loop_scope = "function"
+asyncio_mode = "auto"
+filterwarnings = [
+  "error",
+  # Starlette's TestClient warns that it will require httpx2. The httpx pin is a
+  # deliberate project-wide choice, so this stays allowed until that pin moves.
+  "default::starlette.exceptions.StarletteDeprecationWarning"
+]
+pythonpath = ["."]
 testpaths = ["tests"]

+# Applied before any conftest or test module is imported, which is what makes it
+# work: `prowler_app/server.py` builds every tool at import time, and a tool whose
+# construction raises (as it does without an API key) is swallowed by
+# `load_all_tools`, leaving the `prowler_*` namespace silently empty. Pinning a
+# fake key here keeps the full tool surface loadable and stops a developer's
+# `mcp_server/.env` from reaching the suite.
+[tool.pytest_env]
+API_BASE_URL = "https://api.testing.invalid/api/v1"
+PROWLER_API_KEY = "pk_fake_api_key_for_unit_testing_only"
+PROWLER_MCP_TRANSPORT_MODE = "stdio"
+
 # Shared ruff baseline (kept in sync with api/pyproject.toml).
 # target-version tracks this project's lowest supported Python.
 [tool.ruff]
@@ -0,0 +1,264 @@
+"""Shared fixtures for the Prowler MCP Server test suite.
+
+This module deliberately does not import ``prowler_mcp_server.server`` at module
+scope. That import builds every tool and reads the environment, so it must happen
+only once the environment is settled. Environment pinning itself lives in
+``[tool.pytest_env]`` in ``pyproject.toml``, which is applied before any conftest
+or test module is imported; the fixtures here only keep it pinned per test.
+
+Three properties of the runtime shape everything below and are easy to get wrong:
+
+1. ``prowler_app/server.py`` builds every tool at import time. A tool whose
+   construction raises -- which is what happens with no API key -- is swallowed by
+   ``load_all_tools``, leaving the ``prowler_*`` namespace silently empty. So the
+   suite pins a fake key rather than stripping the real one.
+2. ``BaseTool.__init__`` captured the ``ProwlerAPIClient`` singleton by reference
+   at import time. Evicting it from the registry does not re-point the tools, so
+   the client must be patched in place.
+3. ``ProwlerAppAuth`` resolves ``PROWLER_MCP_TRANSPORT_MODE`` and ``API_BASE_URL``
+   in its default arguments, which are evaluated once at module import.
+   ``monkeypatch.setenv`` cannot change them -- pass ``mode=``/``base_url=``
+   explicitly instead.
+"""
+
+import socket
+from collections.abc import Callable, Iterator
+
+import httpx
+import pytest
+from starlette.requests import Request
+from starlette.testclient import TestClient
+
+from tests.helpers.http import MockRouter
+from tests.helpers.tokens import FAKE_API_KEY
+
+# Must match [tool.pytest_env] in pyproject.toml: the env var is what the code
+# reads at import time, this constant is what tests assert against.
+TEST_API_BASE_URL = "https://api.testing.invalid/api/v1"
+
+
+# --------------------------------------------------------------- environment
+
+
+@pytest.fixture(autouse=True)
+def _pinned_environment(monkeypatch: pytest.MonkeyPatch) -> None:
+    """Pin the runtime environment to deterministic test values.
+
+    Pinned rather than stripped: a missing ``PROWLER_API_KEY`` collapses the
+    ``prowler_*`` namespace to zero tools instead of failing loudly.
+    ``PROWLER_APP_API_KEY`` is the deprecated fallback and is removed so only a
+    test that sets it exercises that path.
+
+    This also stops a developer's gitignored ``mcp_server/.env`` or shell
+    environment from reaching the suite.
+    """
+    monkeypatch.setenv("PROWLER_API_KEY", FAKE_API_KEY)
+    monkeypatch.setenv("API_BASE_URL", TEST_API_BASE_URL)
+    monkeypatch.setenv("PROWLER_MCP_TRANSPORT_MODE", "stdio")
+    monkeypatch.delenv("PROWLER_APP_API_KEY", raising=False)
+
+
+@pytest.fixture(autouse=True)
+def _no_real_network(monkeypatch: pytest.MonkeyPatch) -> None:
+    """Fail loudly on any real outbound socket connection.
+
+    The subject under test is an HTTP client, so a route that was not mocked must
+    fail fast and obviously rather than quietly reaching hub.prowler.com and
+    making the suite slow, flaky and dependent on someone else's uptime.
+
+    In-process transports (Starlette's ``TestClient``, fastmcp's in-memory
+    client) do not open sockets, so this does not interfere with them.
+    """
+
+    def _blocked(self: socket.socket, address: object, *_: object) -> None:
+        raise RuntimeError(
+            f"Blocked a real network connection to {address}. Drive HTTP through "
+            "the mock_api_client, hub_router or docs_router fixtures."
+        )
+
+    monkeypatch.setattr(socket.socket, "connect", _blocked)
+    monkeypatch.setattr(socket.socket, "connect_ex", _blocked)
+
+
+# ----------------------------------------------------------------- API client
+
+
+@pytest.fixture(autouse=True)
+def _singleton_registry_guard() -> Iterator[None]:
+    """Snapshot and restore the singleton registry around every test.
+
+    Deliberately a snapshot, not a clear. ``BaseTool.__init__`` captured the
+    ``ProwlerAPIClient`` instance by reference at import time, so evicting it
+    would leave every registered tool pointing at an orphan that later fixtures
+    cannot patch -- one holding a real ``httpx.AsyncClient``. Restoring keeps a
+    test that resets on purpose from leaking into the next one.
+    """
+    from prowler_mcp_server.prowler_app.utils.api_client import SingletonMeta
+
+    snapshot = dict(SingletonMeta._instances)
+    try:
+        yield
+    finally:
+        SingletonMeta._instances.clear()
+        SingletonMeta._instances.update(snapshot)
+
+
+@pytest.fixture
+def mock_router() -> MockRouter:
+    """An empty route registry and request recorder for this test."""
+    return MockRouter()
+
+
+@pytest.fixture
+def api_client():
+    """The live ``ProwlerAPIClient`` singleton that every registered tool holds."""
+    from prowler_mcp_server.prowler_app.utils.api_client import ProwlerAPIClient
+
+    return ProwlerAPIClient()
+
+
+@pytest.fixture
+def mock_api_client(api_client, mock_router: MockRouter) -> Iterator:
+    """The API client singleton, with its transport driven by ``mock_router``.
+
+    Swaps ``.client`` in place rather than constructing a fresh client, so tools
+    reached through the MCP protocol -- which hold this exact instance -- are
+    mocked too. Everything else still runs for real: URL joining, query encoding,
+    auth headers, ``raise_for_status()`` and the JSON:API error unwrapping.
+    """
+    original = api_client.client
+    api_client.client = httpx.AsyncClient(transport=mock_router.transport, timeout=30.0)
+    try:
+        yield api_client
+    finally:
+        api_client.client = original
+
+
+@pytest.fixture
+def isolated_api_client() -> Iterator[type]:
+    """Evict the singleton so a test can exercise construction semantics.
+
+    Only for tests *about* ``ProwlerAPIClient`` itself -- its ``__init__`` or its
+    singleton identity. Anything reached through a tool must use
+    ``mock_api_client``, because the tools still point at the original instance.
+    """
+    from prowler_mcp_server.prowler_app.utils.api_client import (
+        ProwlerAPIClient,
+        SingletonMeta,
+    )
+
+    SingletonMeta._instances.pop(ProwlerAPIClient, None)
+    yield ProwlerAPIClient
+
+
+# --------------------------------------------------------------- MCP surface
+
+
+@pytest.fixture(scope="session")
+def mcp_root_server():
+    """The mounted root MCP server, imported lazily because importing has effects.
+
+    Tests open their own client over this (``async with Client(mcp_root_server)``)
+    rather than receiving a connected one, because FastMCP warns that holding a
+    client in a fixture causes hard-to-diagnose event-loop problems.
+    """
+    from prowler_mcp_server.server import prowler_mcp_server
+
+    return prowler_mcp_server
+
+
+@pytest.fixture
+def health_client() -> Iterator[TestClient]:
+    """An ASGI client over the stateless HTTP app, for the ``/health`` route."""
+    from prowler_mcp_server.server import app
+
+    with TestClient(app) as client:
+        yield client
+
+
+@pytest.fixture
+def http_request_headers() -> Iterator[Callable[..., None]]:
+    """Return a callable that makes ``get_http_headers()`` observe given headers.
+
+    In HTTP transport mode ``ProwlerAppAuth`` reads the authorization header
+    through fastmcp's request context variable. Setting that variable directly is
+    what lets an auth test run without standing up a real HTTP server.
+
+    Underscores in keyword names become hyphens, so ``x_request_id=`` sets
+    ``x-request-id``.
+    """
+    from fastmcp.server.http import _current_http_request
+
+    def _set(**headers: str) -> None:
+        scope = {
+            "type": "http",
+            "http_version": "1.1",
+            "method": "POST",
+            "path": "/mcp",
+            "raw_path": b"/mcp",
+            "root_path": "",
+            "scheme": "http",
+            "query_string": b"",
+            "server": ("testserver", 80),
+            "client": ("testclient", 50000),
+            "headers": [
+                (name.lower().replace("_", "-").encode(), value.encode())
+                for name, value in headers.items()
+            ],
+        }
+        _current_http_request.set(Request(scope))
+
+    try:
+        yield _set
+    finally:
+        # Not a token-based reset: an async test calls `_set` inside its task,
+        # and asyncio gives each task its own copy of the context, so the token
+        # cannot be reset from here and the task's value is discarded with the
+        # task anyway. Clearing the value covers the sync-test case, where the
+        # set would otherwise persist into the next test.
+        _current_http_request.set(None)
+
+
+# ------------------------------------------------------- hub / docs sub-servers
+
+
+def _clone_with_transport(
+    client: httpx.Client, transport: httpx.MockTransport
+) -> httpx.Client:
+    """Copy a sync client's base URL and headers onto a mock transport."""
+    return httpx.Client(
+        base_url=client.base_url,
+        headers=dict(client.headers),
+        transport=transport,
+    )
+
+
+@pytest.fixture
+def hub_router(monkeypatch: pytest.MonkeyPatch, mock_router: MockRouter) -> MockRouter:
+    """Route the Prowler Hub sub-server's two module-level sync clients.
+
+    Hub tools are synchronous and reach for these clients by module global, so
+    they are replaced on the module rather than injected.
+    """
+    from prowler_mcp_server.prowler_hub import server as hub
+
+    for name in ("prowler_hub_client", "github_raw_client"):
+        monkeypatch.setattr(
+            hub, name, _clone_with_transport(getattr(hub, name), mock_router.transport)
+        )
+    return mock_router
+
+
+@pytest.fixture
+def docs_router(monkeypatch: pytest.MonkeyPatch, mock_router: MockRouter) -> MockRouter:
+    """Route the documentation search engine's two sync clients."""
+    from prowler_mcp_server.prowler_documentation import server as docs
+
+    engine = docs.prowler_docs_search_engine
+    for name in ("mintlify_client", "docs_client"):
+        monkeypatch.setattr(
+            engine,
+            name,
+            _clone_with_transport(getattr(engine, name), mock_router.transport),
+        )
+    return mock_router
@@ -0,0 +1,49 @@
+"""Shared test helpers for the Prowler MCP Server suite.
+
+Import from the submodules directly (``from tests.helpers.jsonapi import ...``);
+this package only re-exports the surface so it is discoverable in one place.
+
+Nothing here is collected by pytest -- ``python_files`` is ``test_*.py``.
+"""
+
+from tests.helpers.assertions import (
+    NAMESPACES,
+    assert_namespaced,
+    assert_tool_contract,
+    tools_in_namespace,
+)
+from tests.helpers.http import MockRouter
+from tests.helpers.jsonapi import (
+    jsonapi_collection,
+    jsonapi_document,
+    jsonapi_error,
+    jsonapi_relationship_many,
+    jsonapi_relationship_one,
+    jsonapi_resource,
+    task_document,
+)
+from tests.helpers.tokens import (
+    FAKE_API_KEY,
+    FAKE_LEGACY_API_KEY,
+    MALFORMED_API_KEY,
+    fake_jwt,
+)
+
+__all__ = [
+    "FAKE_API_KEY",
+    "FAKE_LEGACY_API_KEY",
+    "MALFORMED_API_KEY",
+    "NAMESPACES",
+    "MockRouter",
+    "assert_namespaced",
+    "assert_tool_contract",
+    "fake_jwt",
+    "jsonapi_collection",
+    "jsonapi_document",
+    "jsonapi_error",
+    "jsonapi_relationship_many",
+    "jsonapi_relationship_one",
+    "jsonapi_resource",
+    "task_document",
+    "tools_in_namespace",
+]
@@ -0,0 +1,66 @@
+"""Assertions for the MCP tool contract every sub-server must honour.
+
+A tool's description and its parameter descriptions are not documentation -- they
+are the only thing a model sees when deciding whether and how to call it. A tool
+that registers without them is invisible in practice, so these are correctness
+assertions rather than style ones.
+"""
+
+from mcp.types import Tool
+
+# Mounted namespaces, most specific first so prefix matching is unambiguous.
+NAMESPACES = ("prowler_hub_", "prowler_docs_", "prowler_")
+
+
+def assert_tool_contract(tool: Tool) -> None:
+    """Assert the tool and all of its parameters carry a usable description.
+
+    Missing and blank are asserted separately because they are different
+    mistakes: a missing description was never written, a blank one exists but was
+    left empty. One truthiness check would report both the same way.
+    """
+    assert tool.description is not None, (
+        f"Tool '{tool.name}' has no description. Its docstring is what the model reads."
+    )
+    assert tool.description.strip(), (
+        f"Tool '{tool.name}' has a blank description. "
+        "Its docstring is what the model reads."
+    )
+
+    # `inputSchema` is a required field of the MCP Tool type, so it is always a
+    # dict; a tool that takes no arguments simply has no `properties`.
+    for parameter, schema in tool.inputSchema.get("properties", {}).items():
+        description = schema.get("description")
+        assert description is not None, (
+            f"Parameter '{parameter}' of tool '{tool.name}' has no description. "
+            "Declare it with pydantic Field(description=...)."
+        )
+        assert description.strip(), (
+            f"Parameter '{parameter}' of tool '{tool.name}' has a blank description. "
+            "Declare it with pydantic Field(description=...)."
+        )
+
+
+def assert_namespaced(tool: Tool) -> None:
+    """Assert the tool is reachable under one of the published namespaces."""
+    assert tool.name.startswith(NAMESPACES), (
+        f"Tool '{tool.name}' is outside the published namespaces {NAMESPACES}"
+    )
+
+
+def tools_in_namespace(tools: list[Tool], namespace: str) -> list[Tool]:
+    """Return the tools in a namespace.
+
+    ``prowler_`` is a prefix of the other two namespaces, so tools belonging to a
+    more specific one are excluded rather than counted twice.
+    """
+    more_specific = tuple(
+        other
+        for other in NAMESPACES
+        if other != namespace and other.startswith(namespace)
+    )
+    return [
+        tool
+        for tool in tools
+        if tool.name.startswith(namespace) and not tool.name.startswith(more_specific)
+    ]
@@ -0,0 +1,108 @@
+"""Route registry and request recorder backed by ``httpx.MockTransport``.
+
+Mocking at the transport boundary rather than stubbing ``client.request`` keeps
+the parts of httpx the code under test actually relies on in play: base-URL
+joining, query-parameter encoding, header assembly, ``raise_for_status()`` and
+JSON decoding. A test that asserts on a recorded request is therefore asserting
+on the bytes that would really have gone out.
+"""
+
+from collections.abc import Callable
+from typing import Any
+
+import httpx
+
+_UNSET = object()
+
+ResponseFactory = Callable[[httpx.Request], httpx.Response]
+
+
+class MockRouter:
+    """Declare ``(METHOD, path) -> response`` and inspect what was requested.
+
+    Responses registered for the same route are consumed in order and the last
+    one repeats forever. That is what makes polling testable: register
+    ``executing``, ``executing``, ``completed`` and the loop sees each in turn.
+
+    An unregistered request raises instead of returning a default, so a test can
+    never silently exercise a different endpoint than the one it set up.
+    """
+
+    def __init__(self) -> None:
+        self._routes: dict[tuple[str, str], list[ResponseFactory]] = {}
+        self.requests: list[httpx.Request] = []
+
+    # --- registration -----------------------------------------------------
+
+    def add(
+        self,
+        method: str,
+        path: str,
+        *,
+        status: int = 200,
+        json: Any = _UNSET,
+        text: str | None = None,
+        headers: dict[str, str] | None = None,
+    ) -> "MockRouter":
+        """Register a canned response for a route. Chainable."""
+        kwargs: dict[str, Any] = {"headers": headers}
+        if json is not _UNSET:
+            kwargs["json"] = json
+        if text is not None:
+            kwargs["text"] = text
+        return self.add_handler(
+            method, path, lambda _request: httpx.Response(status, **kwargs)
+        )
+
+    def add_handler(
+        self, method: str, path: str, handler: ResponseFactory
+    ) -> "MockRouter":
+        """Register a callable that builds the response from the request."""
+        self._routes.setdefault((method.upper(), path), []).append(handler)
+        return self
+
+    # --- transport --------------------------------------------------------
+
+    @property
+    def transport(self) -> httpx.MockTransport:
+        """A transport that serves this router. Works for sync and async clients."""
+        return httpx.MockTransport(self._handle)
+
+    def _handle(self, request: httpx.Request) -> httpx.Response:
+        self.requests.append(request)
+        queue = self._routes.get((request.method.upper(), request.url.path))
+        if not queue:
+            registered = (
+                ", ".join(f"{method} {path}" for method, path in sorted(self._routes))
+                or "none"
+            )
+            raise AssertionError(
+                f"Unregistered request {request.method} {request.url}. "
+                f"Registered routes: {registered}"
+            )
+        # Keep the final response so a route can be polled repeatedly.
+        factory = queue.pop(0) if len(queue) > 1 else queue[0]
+        return factory(request)
+
+    # --- inspection -------------------------------------------------------
+
+    def request_for(self, method: str, path: str) -> httpx.Request:
+        """Return the last recorded request for a route, failing if there is none."""
+        matches = [
+            request
+            for request in self.requests
+            if request.method.upper() == method.upper() and request.url.path == path
+        ]
+        if not matches:
+            raise AssertionError(
+                f"No {method.upper()} {path} request was made. Made: {self.paths()}"
+            )
+        return matches[-1]
+
+    def query_params(self, method: str, path: str) -> dict[str, str]:
+        """Return the decoded query parameters of the last request for a route."""
+        return dict(self.request_for(method, path).url.params)
+
+    def paths(self) -> list[str]:
+        """Return every request made so far, as ``"METHOD /path"`` strings."""
+        return [f"{request.method} {request.url.path}" for request in self.requests]
@@ -0,0 +1,112 @@
+"""Builders for the JSON:API documents the Prowler API returns.
+
+Every model's ``from_api_response()`` and every tool's error path consumes one of
+these shapes, so building them by hand in each test would duplicate the document
+structure hundreds of times. The builders keep the *shape* in one place so tests
+only express the part they actually care about.
+"""
+
+from typing import Any
+
+
+def jsonapi_relationship_many(resource_type: str, *ids: str) -> dict[str, Any]:
+    """Build a to-many relationship.
+
+    Passing no ids yields a present-but-empty relationship (``{"data": []}``),
+    which ``extract_relationship_ids`` reports as ``[]`` rather than ``None``.
+    """
+    return {"data": [{"type": resource_type, "id": resource_id} for resource_id in ids]}
+
+
+def jsonapi_relationship_one(resource_type: str, resource_id: str) -> dict[str, Any]:
+    """Build a to-one relationship."""
+    return {"data": {"type": resource_type, "id": resource_id}}
+
+
+def jsonapi_resource(
+    resource_type: str,
+    resource_id: str,
+    attributes: dict[str, Any] | None = None,
+    relationships: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Build a single JSON:API resource object.
+
+    ``relationships`` is omitted from the result entirely when not supplied, so a
+    test can express "the document did not expose this relationship"
+    (``extract_relationship_ids`` -> ``None``) distinctly from "the relationship
+    is present and empty" (-> ``[]``). Conflating the two is exactly the bug the
+    models go out of their way to avoid.
+    """
+    resource: dict[str, Any] = {
+        "type": resource_type,
+        "id": resource_id,
+        "attributes": attributes or {},
+    }
+    if relationships is not None:
+        resource["relationships"] = relationships
+    return resource
+
+
+def jsonapi_document(
+    data: dict[str, Any] | list[dict[str, Any]],
+    included: list[dict[str, Any]] | None = None,
+    meta: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Build a top-level JSON:API document."""
+    document: dict[str, Any] = {"data": data}
+    if included is not None:
+        document["included"] = included
+    if meta is not None:
+        document["meta"] = meta
+    return document
+
+
+def jsonapi_collection(
+    items: list[dict[str, Any]],
+    *,
+    page: int = 1,
+    pages: int = 1,
+    count: int | None = None,
+    included: list[dict[str, Any]] | None = None,
+) -> dict[str, Any]:
+    """Build a paginated collection document.
+
+    The ``meta.pagination`` keys are exactly the ones every ``*ListResponse``
+    reads (``page``, ``pages``, ``count``). ``count`` defaults to the number of
+    items so the common single-page case needs no arguments.
+    """
+    return jsonapi_document(
+        data=items,
+        included=included,
+        meta={
+            "pagination": {
+                "page": page,
+                "pages": pages,
+                "count": len(items) if count is None else count,
+            }
+        },
+    )
+
+
+def jsonapi_error(status: int, detail: str, title: str | None = None) -> dict[str, Any]:
+    """Build an error document.
+
+    ``ProwlerAPIClient._make_request`` surfaces ``errors[0].detail`` in the
+    exception message it raises, and tools relay that straight to the model.
+    """
+    error: dict[str, Any] = {"status": str(status), "detail": detail}
+    if title is not None:
+        error["title"] = title
+    return {"errors": [error]}
+
+
+def task_document(task_id: str, state: str, error: str | None = None) -> dict[str, Any]:
+    """Build a ``/tasks/{id}`` document for driving ``poll_task_until_complete``.
+
+    Register a sequence of these on a ``MockRouter`` route (for example
+    ``executing``, ``executing``, ``completed``) to exercise the polling loop.
+    """
+    attributes: dict[str, Any] = {"state": state}
+    if error is not None:
+        attributes["error"] = error
+    return jsonapi_document(jsonapi_resource("tasks", task_id, attributes))
@@ -0,0 +1,34 @@
+"""Obviously-fake credentials for tests.
+
+Deliberately unrealistic so repository secret scanning does not flag them. Never
+put a value here that could be mistaken for a real key.
+"""
+
+import base64
+import json
+import time
+
+# Prowler API keys are recognised by their `pk_` prefix; anything else is rejected.
+FAKE_API_KEY = "pk_fake_api_key_for_unit_testing_only"
+FAKE_LEGACY_API_KEY = "pk_fake_legacy_api_key_for_unit_testing_only"
+MALFORMED_API_KEY = "not_a_prowler_api_key"
+
+
+def fake_jwt(expires_in: int = 3600, **claims: object) -> str:
+    """Mint an unsigned JWT whose ``exp`` is ``expires_in`` seconds from now.
+
+    Pass a negative ``expires_in`` for an already-expired token.
+
+    ``ProwlerAppAuth._parse_jwt`` only base64url-decodes the payload and reads
+    ``exp`` -- it never verifies the signature, because the Prowler API is what
+    validates the token. A placeholder signature is therefore enough, and avoids
+    adding a JWT library just for tests.
+    """
+
+    def _segment(payload: dict[str, object]) -> str:
+        raw = json.dumps(payload, separators=(",", ":")).encode()
+        return base64.urlsafe_b64encode(raw).decode().rstrip("=")
+
+    header = _segment({"alg": "HS256", "typ": "JWT"})
+    body = _segment({"exp": int(time.time()) + expires_in, **claims})
+    return f"{header}.{body}.fake-signature-not-verified"
@@ -0,0 +1 @@
+"""Tests for the Prowler App sub-server."""
@@ -0,0 +1 @@
+"""Tests for the Prowler App Pydantic models."""
@@ -0,0 +1,205 @@
+"""Tests for the security finding models.
+
+Reference for later branches: build the API document with the ``jsonapi``
+helpers, run it through ``from_api_response()``, then assert on both the model
+and its ``model_dump()``. The dump is what the agent actually receives, and
+``MinimalSerializerMixin`` makes the two differ.
+"""
+
+from prowler_mcp_server.prowler_app.models.findings import (
+    DetailedFinding,
+    FindingsListResponse,
+    FindingsOverview,
+    SimplifiedFinding,
+)
+from tests.helpers.jsonapi import (
+    jsonapi_collection,
+    jsonapi_relationship_many,
+    jsonapi_relationship_one,
+    jsonapi_resource,
+)
+
+CHECK_METADATA = {
+    "checkid": "s3_bucket_public_access",
+    "checktitle": "Ensure S3 buckets block public access",
+    "description": "Checks whether the bucket blocks public access.",
+    "provider": "aws",
+    "servicename": "s3",
+    "resourcetype": "AwsS3Bucket",
+    "risk": "Public buckets expose data to the internet.",
+    "additionalurls": ["https://docs.aws.amazon.com/s3/"],
+    "categories": ["encryption", "internet-exposed"],
+}
+
+FINDING_ATTRIBUTES = {
+    "uid": "prowler-aws-s3_bucket_public_access-123456789012-us-east-1-my-bucket",
+    "status": "FAIL",
+    "severity": "high",
+    "status_extended": "S3 bucket my-bucket is publicly accessible.",
+    "delta": "new",
+    "muted": False,
+    "muted_reason": None,
+    "check_metadata": CHECK_METADATA,
+}
+
+DETAILED_ATTRIBUTES = {
+    **FINDING_ATTRIBUTES,
+    "inserted_at": "2025-01-15T10:00:00Z",
+    "updated_at": "2025-01-15T10:00:00Z",
+    "first_seen_at": "2025-01-10T09:00:00Z",
+}
+
+
+def test_simplified_finding_lifts_the_check_id_out_of_the_check_metadata():
+    """`check_id` is nested under `check_metadata.checkid` in the API document.
+
+    Flattening it is what lets an agent filter findings by check without being
+    handed the whole metadata blob for every row in a list.
+    """
+    finding = SimplifiedFinding.from_api_response(
+        jsonapi_resource("findings", "f1", FINDING_ATTRIBUTES)
+    )
+
+    assert finding.check_id == "s3_bucket_public_access"
+    assert finding.severity == "high"
+    assert finding.status == "FAIL"
+
+
+def test_empty_finding_fields_are_dropped_from_the_serialized_payload():
+    """Empty values are removed to keep the payload small for the model.
+
+    `muted_reason` is None on an unmuted finding; emitting it would spend tokens
+    on every row of every list response to say nothing.
+    """
+    finding = SimplifiedFinding.from_api_response(
+        jsonapi_resource("findings", "f1", FINDING_ATTRIBUTES)
+    )
+
+    dumped = finding.model_dump()
+
+    assert "muted_reason" not in dumped
+    assert dumped["uid"] == FINDING_ATTRIBUTES["uid"]
+
+
+def test_detailed_finding_parses_both_relationship_shapes():
+    """`scan` is a to-one relationship and `resources` is to-many.
+
+    They are read from the same `relationships` object but reduce to a single id
+    and a list of ids respectively.
+    """
+    resource = jsonapi_resource(
+        "findings",
+        "f1",
+        attributes=DETAILED_ATTRIBUTES,
+        relationships={
+            "scan": jsonapi_relationship_one("scans", "s1"),
+            "resources": jsonapi_relationship_many("resources", "r1", "r2"),
+        },
+    )
+
+    finding = DetailedFinding.from_api_response(resource)
+
+    assert finding.scan_id == "s1"
+    assert finding.resource_ids == ["r1", "r2"]
+
+
+def test_detailed_finding_tolerates_missing_relationships():
+    """A document without relationships must not raise.
+
+    `get_finding_details` requests `include=scan,resources`, but a finding whose
+    scan has been pruned still has to render rather than fail the tool call.
+    """
+    finding = DetailedFinding.from_api_response(
+        jsonapi_resource("findings", "f1", DETAILED_ATTRIBUTES)
+    )
+
+    assert finding.scan_id is None
+    assert finding.resource_ids == []
+
+
+def test_detailed_finding_flattens_the_nested_remediation_guidance():
+    """Remediation is the payload an agent needs to actually fix the finding.
+
+    The API nests it under `remediation.code.*` and `remediation.recommendation.text`;
+    the model flattens both into one object.
+    """
+    attributes = {
+        **DETAILED_ATTRIBUTES,
+        "check_metadata": {
+            **CHECK_METADATA,
+            "remediation": {
+                "code": {
+                    "cli": "aws s3api put-public-access-block ...",
+                    "terraform": 'resource "aws_s3_bucket_public_access_block" ...',
+                    "nativeiac": "",
+                    "other": "",
+                },
+                "recommendation": {"text": "Block all public access on the bucket."},
+            },
+        },
+    }
+
+    finding = DetailedFinding.from_api_response(
+        jsonapi_resource("findings", "f1", attributes)
+    )
+
+    remediation = finding.check_metadata.remediation
+    assert remediation.cli.startswith("aws s3api")
+    assert remediation.recommendation == "Block all public access on the bucket."
+    # Empty code snippets are dropped rather than shown as blank fields.
+    assert "nativeiac" not in remediation.model_dump()
+
+
+def test_check_metadata_without_remediation_is_left_unset():
+    """Not every check ships remediation guidance; absence must not fabricate one."""
+    finding = DetailedFinding.from_api_response(
+        jsonapi_resource("findings", "f1", DETAILED_ATTRIBUTES)
+    )
+
+    assert finding.check_metadata.remediation is None
+    assert "remediation" not in finding.check_metadata.model_dump()
+
+
+def test_list_response_carries_the_api_pagination_metadata():
+    """Pagination tells an agent whether it has seen everything it asked for."""
+    response = jsonapi_collection(
+        [jsonapi_resource("findings", "f1", FINDING_ATTRIBUTES)],
+        page=2,
+        pages=7,
+        count=312,
+    )
+
+    result = FindingsListResponse.from_api_response(response)
+
+    assert result.current_page == 2
+    assert result.total_num_pages == 7
+    assert result.total_num_finding == 312
+    assert result.findings[0].check_id == "s3_bucket_public_access"
+
+
+def test_overview_renames_the_pass_attribute_to_a_valid_identifier():
+    """The API's `pass` count cannot keep its name -- `pass` is a Python keyword."""
+    response = jsonapi_resource(
+        "findings-overview",
+        "overview",
+        {
+            "total": 100,
+            "fail": 30,
+            "pass": 60,
+            "muted": 10,
+            "new": 5,
+            "changed": 3,
+            "fail_new": 2,
+            "fail_changed": 1,
+            "pass_new": 2,
+            "pass_changed": 1,
+            "muted_new": 1,
+            "muted_changed": 1,
+        },
+    )
+
+    overview = FindingsOverview.from_api_response({"data": response})
+
+    assert overview.passed == 60
+    assert overview.fail == 30
+    assert overview.total == 100
@@ -0,0 +1,57 @@
+"""Tests for the shared JSON:API response-parsing helpers.
+
+These back every model's ``from_api_response()``, so they are foundation-level
+rather than tied to any one feature.
+"""
+
+from prowler_mcp_server.prowler_app.models.utils import extract_relationship_ids
+from tests.helpers.jsonapi import jsonapi_relationship_many, jsonapi_relationship_one
+
+
+def test_an_absent_relationship_is_unknown_rather_than_empty():
+    """A relationship the document never mentioned yields None, not [].
+
+    Returning [] would tell an agent "this role is assigned to nobody" when the
+    serializer simply did not expose the relationship -- for example a role
+    included via `?include=roles`, which carries no `users`.
+    """
+    assert extract_relationship_ids({}, "users") is None
+
+
+def test_a_present_but_empty_relationship_is_explicitly_empty():
+    """An empty relationship yields [], which genuinely means "none"."""
+    relationships = {"users": jsonapi_relationship_many("users")}
+
+    assert extract_relationship_ids(relationships, "users") == []
+
+
+def test_a_to_many_relationship_is_flattened_to_its_ids():
+    """Linkage objects are reduced to the plain ids the tools pass around."""
+    relationships = {"users": jsonapi_relationship_many("users", "u1", "u2")}
+
+    assert extract_relationship_ids(relationships, "users") == ["u1", "u2"]
+
+
+def test_a_to_one_relationship_is_returned_as_a_single_element_list():
+    """To-one and to-many both return a list so callers need no shape check."""
+    relationships = {"scan": jsonapi_relationship_one("scans", "s1")}
+
+    assert extract_relationship_ids(relationships, "scan") == ["s1"]
+
+
+def test_a_null_to_one_relationship_is_empty():
+    """An explicitly null to-one link means "not related", not "unknown"."""
+    relationships = {"scan": {"data": None}}
+
+    assert extract_relationship_ids(relationships, "scan") == []
+
+
+def test_members_without_an_id_are_discarded():
+    """Malformed linkage must not surface as a None entry in the id list.
+
+    A None id would flow into a tool's next request and produce a confusing
+    404 rather than a clean, short list.
+    """
+    relationships = {"users": {"data": [{"type": "users", "id": "u1"}, {}]}}
+
+    assert extract_relationship_ids(relationships, "users") == ["u1"]
@@ -0,0 +1 @@
+"""Tests for the Prowler App MCP tools."""
@@ -0,0 +1,347 @@
+"""Tests for the security findings tools.
+
+Reference for later branches. Drive tools through an in-memory MCP client by
+default. Tool parameters are declared with pydantic ``Field(default=...)``, and
+those defaults are only resolved by FastMCP's tool wrapper -- calling the method
+directly leaves an omitted argument as a raw ``FieldInfo`` object, which is
+truthy and silently produces nonsense filters. Call the method directly only when
+passing every argument explicitly.
+
+Everything here relies on ``mock_api_client`` patching the API client *in place*:
+the tool instances captured that exact object when the package was imported, so a
+freshly-constructed client would not reach them.
+"""
+
+import pytest
+from fastmcp import Client
+
+from tests.helpers.jsonapi import (
+    jsonapi_collection,
+    jsonapi_error,
+    jsonapi_relationship_one,
+    jsonapi_resource,
+)
+
+LATEST = "/api/v1/findings/latest"
+HISTORICAL = "/api/v1/findings"
+
+CHECK_METADATA = {
+    "checkid": "s3_bucket_public_access",
+    "checktitle": "Ensure S3 buckets block public access",
+    "description": "Checks whether the bucket blocks public access.",
+    "provider": "aws",
+    "servicename": "s3",
+    "resourcetype": "AwsS3Bucket",
+    "risk": "Public buckets expose data to the internet.",
+    "additionalurls": [],
+    "categories": ["internet-exposed"],
+}
+
+FINDING_ATTRIBUTES = {
+    "uid": "prowler-aws-s3_bucket_public_access-123456789012-us-east-1-my-bucket",
+    "status": "FAIL",
+    "severity": "high",
+    "status_extended": "S3 bucket my-bucket is publicly accessible.",
+    "delta": "new",
+    "muted": False,
+    "muted_reason": None,
+    "check_metadata": CHECK_METADATA,
+}
+
+
+async def test_search_without_dates_queries_the_latest_scan_endpoint(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """With no date range the tool targets `/findings/latest`.
+
+    That endpoint reads only the most recent completed scan, which is far cheaper
+    than a historical query -- so picking the wrong one is a performance
+    regression the response body alone would not reveal.
+    """
+    mock_router.add(
+        "GET",
+        LATEST,
+        json=jsonapi_collection(
+            [jsonapi_resource("findings", "f1", FINDING_ATTRIBUTES)]
+        ),
+    )
+
+    async with Client(mcp_root_server) as client:
+        result = await client.call_tool("prowler_search_security_findings", {})
+
+    assert result.data["findings"][0]["check_id"] == "s3_bucket_public_access"
+    assert mock_router.paths() == [f"GET {LATEST}"]
+
+
+async def test_search_defaults_to_failed_findings_only(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """The default filter is FAIL, so an unqualified search surfaces real issues.
+
+    Also pins the sort order and field selection, which together keep the
+    response small and severity-first.
+    """
+    mock_router.add("GET", LATEST, json=jsonapi_collection([]))
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool("prowler_search_security_findings", {})
+
+    params = mock_router.query_params("GET", LATEST)
+    assert params["filter[status__in]"] == "FAIL"
+    assert params["sort"] == "severity,-inserted_at"
+    assert params["page[size]"] == "50"
+
+
+async def test_search_with_dates_switches_to_the_historical_endpoint(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """A date range moves the query to `/findings` with an inserted_at window.
+
+    Supplying only `date_from` auto-completes the other boundary, so the caller
+    cannot accidentally request an unbounded historical scan.
+    """
+    mock_router.add("GET", HISTORICAL, json=jsonapi_collection([]))
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool(
+            "prowler_search_security_findings", {"date_from": "2025-01-15"}
+        )
+
+    params = mock_router.query_params("GET", HISTORICAL)
+    assert params["filter[inserted_at__gte]"] == "2025-01-15"
+    assert params["filter[inserted_at__lte]"] == "2025-01-16"
+
+
+async def test_search_rejects_a_date_range_wider_than_the_api_allows(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """The API caps historical queries at two days; reject before the round trip."""
+    async with Client(mcp_root_server) as client:
+        with pytest.raises(Exception, match="Date range cannot exceed 2 days"):
+            await client.call_tool(
+                "prowler_search_security_findings",
+                {"date_from": "2025-01-01", "date_to": "2025-01-10"},
+            )
+
+    assert mock_router.requests == []
+
+
+async def test_search_encodes_list_filters_as_comma_separated_values(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """Multi-value filters reach the API as CSV, not as repeated query keys."""
+    mock_router.add("GET", LATEST, json=jsonapi_collection([]))
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool(
+            "prowler_search_security_findings",
+            {"severity": ["critical", "high"], "service": ["s3", "ec2"]},
+        )
+
+    params = mock_router.query_params("GET", LATEST)
+    assert params["filter[severity__in]"] == "critical,high"
+    assert params["filter[service__in]"] == "s3,ec2"
+
+
+@pytest.mark.parametrize(
+    ("argument", "value", "expected_key", "expected_value"),
+    [
+        ("provider_type", ["aws", "gcp"], "filter[provider_type__in]", "aws,gcp"),
+        ("provider_alias", "prod", "filter[provider_alias__icontains]", "prod"),
+        ("region", ["us-east-1"], "filter[region__in]", "us-east-1"),
+        ("resource_type", ["AwsS3Bucket"], "filter[resource_type__in]", "AwsS3Bucket"),
+        (
+            "check_id",
+            ["s3_bucket_public_access"],
+            "filter[check_id__in]",
+            "s3_bucket_public_access",
+        ),
+        ("delta", ["new"], "filter[delta__in]", "new"),
+        ("search", "bucket", "filter[search]", "bucket"),
+    ],
+)
+async def test_search_maps_each_argument_onto_its_api_filter(
+    mcp_root_server,
+    mock_api_client,
+    mock_router,
+    argument,
+    value,
+    expected_key,
+    expected_value,
+):
+    """Every search argument maps to a specific API filter key.
+
+    A mistyped filter key is not an error the API reports -- it is simply ignored,
+    so the tool returns unfiltered results while appearing to work. Pinning the
+    exact key per argument is the only thing that catches that.
+    """
+    mock_router.add("GET", LATEST, json=jsonapi_collection([]))
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool("prowler_search_security_findings", {argument: value})
+
+    assert mock_router.query_params("GET", LATEST)[expected_key] == expected_value
+
+
+async def test_overview_can_be_scoped_to_a_provider(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """The aggregate report accepts the same provider filter as the search tool."""
+    mock_router.add(
+        "GET",
+        "/api/v1/overviews/findings",
+        json={
+            "data": jsonapi_resource(
+                "findings-overview",
+                "overview",
+                dict.fromkeys(
+                    [
+                        "total",
+                        "fail",
+                        "pass",
+                        "muted",
+                        "new",
+                        "changed",
+                        "fail_new",
+                        "fail_changed",
+                        "pass_new",
+                        "pass_changed",
+                        "muted_new",
+                        "muted_changed",
+                    ],
+                    0,
+                ),
+            )
+        },
+    )
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool(
+            "prowler_get_findings_overview", {"provider_type": ["aws"]}
+        )
+
+    params = mock_router.query_params("GET", "/api/v1/overviews/findings")
+    assert params["filter[provider_type__in]"] == "aws"
+
+
+async def test_search_normalises_a_string_muted_flag_to_a_boolean(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """`muted` accepts a string because some MCP clients send booleans as text.
+
+    It still has to reach the API as a lowercase boolean, otherwise the filter is
+    silently ignored and the agent gets muted findings it asked to exclude.
+    """
+    mock_router.add("GET", LATEST, json=jsonapi_collection([]))
+
+    async with Client(mcp_root_server) as client:
+        await client.call_tool("prowler_search_security_findings", {"muted": "true"})
+
+    assert mock_router.query_params("GET", LATEST)["filter[muted]"] == "true"
+
+
+async def test_search_rejects_an_out_of_range_page_size(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """Page size is validated locally, saving a round trip on an obvious mistake."""
+    async with Client(mcp_root_server) as client:
+        with pytest.raises(Exception, match="Must be between 1 and 1000"):
+            await client.call_tool(
+                "prowler_search_security_findings", {"page_size": 5000}
+            )
+
+    assert mock_router.requests == []
+
+
+async def test_get_finding_details_requests_its_relationships(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """Details are only useful with the scan and resources included.
+
+    Dropping the `include` would leave `scan_id` and `resource_ids` empty and the
+    agent unable to pivot from a finding to the resource it concerns.
+    """
+    attributes = {
+        **FINDING_ATTRIBUTES,
+        "inserted_at": "2025-01-15T10:00:00Z",
+        "updated_at": "2025-01-15T10:00:00Z",
+    }
+    mock_router.add(
+        "GET",
+        f"{HISTORICAL}/f1",
+        json={
+            "data": jsonapi_resource(
+                "findings",
+                "f1",
+                attributes,
+                relationships={"scan": jsonapi_relationship_one("scans", "s1")},
+            )
+        },
+    )
+
+    async with Client(mcp_root_server) as client:
+        result = await client.call_tool(
+            "prowler_get_finding_details", {"finding_id": "f1"}
+        )
+
+    assert result.data["scan_id"] == "s1"
+    assert mock_router.query_params("GET", f"{HISTORICAL}/f1")["include"] == (
+        "scan,resources"
+    )
+
+
+async def test_get_finding_details_surfaces_the_api_error_detail(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """A missing finding surfaces the API's message rather than an opaque failure."""
+    mock_router.add(
+        "GET", f"{HISTORICAL}/nope", status=404, json=jsonapi_error(404, "Not found.")
+    )
+
+    async with Client(mcp_root_server) as client:
+        with pytest.raises(Exception, match="Not found."):
+            await client.call_tool(
+                "prowler_get_finding_details", {"finding_id": "nope"}
+            )
+
+
+async def test_overview_renders_a_markdown_report_with_percentages(
+    mcp_root_server, mock_api_client, mock_router
+):
+    """The overview returns prose, not a model, so the arithmetic is the contract.
+
+    Percentages are derived here rather than by the API, which makes them the one
+    part of this tool that can silently go wrong.
+    """
+    mock_router.add(
+        "GET",
+        "/api/v1/overviews/findings",
+        json={
+            "data": jsonapi_resource(
+                "findings-overview",
+                "overview",
+                {
+                    "total": 200,
+                    "fail": 50,
+                    "pass": 130,
+                    "muted": 20,
+                    "new": 10,
+                    "changed": 4,
+                    "fail_new": 6,
+                    "fail_changed": 2,
+                    "pass_new": 3,
+                    "pass_changed": 1,
+                    "muted_new": 1,
+                    "muted_changed": 1,
+                },
+            )
+        },
+    )
+
+    async with Client(mcp_root_server) as client:
+        result = await client.call_tool("prowler_get_findings_overview", {})
+
+    report = result.data["report"]
+    assert "**Total Findings**: 200" in report
+    assert "**Failed Checks**: 50 (25.0%)" in report
+    assert "**Unchanged**: 186" in report
@@ -0,0 +1 @@
+"""Tests for the Prowler App shared utilities."""
@@ -0,0 +1,83 @@
+"""Tests for the shared Prowler API client.
+
+Reference for later branches: drive the client through ``mock_api_client`` +
+``mock_router`` and assert on the recorded request, so the real URL joining,
+query encoding and header assembly stay covered.
+"""
+
+import pytest
+
+from tests.helpers.jsonapi import jsonapi_collection, jsonapi_error, jsonapi_resource
+from tests.helpers.tokens import FAKE_API_KEY
+
+
+async def test_get_sends_an_authenticated_jsonapi_request(mock_api_client, mock_router):
+    """A GET carries the API key and the JSON:API content negotiation headers."""
+    mock_router.add(
+        "GET",
+        "/api/v1/findings",
+        json=jsonapi_collection(
+            [jsonapi_resource("findings", "f1", {"severity": "high"})]
+        ),
+    )
+
+    await mock_api_client.get("/findings")
+
+    request = mock_router.request_for("GET", "/api/v1/findings")
+    assert request.headers["authorization"] == f"Api-Key {FAKE_API_KEY}"
+    assert request.headers["accept"] == "application/vnd.api+json"
+    assert request.headers["user-agent"].startswith("prowler-mcp-server/")
+
+
+async def test_get_forwards_query_parameters(mock_api_client, mock_router):
+    """Filter parameters reach the wire with their JSON:API bracket syntax intact."""
+    mock_router.add("GET", "/api/v1/findings", json=jsonapi_collection([]))
+
+    await mock_api_client.get(
+        "/findings", params={"page[size]": 5, "filter[severity__in]": "critical"}
+    )
+
+    assert mock_router.query_params("GET", "/api/v1/findings") == {
+        "page[size]": "5",
+        "filter[severity__in]": "critical",
+    }
+
+
+async def test_error_response_surfaces_the_jsonapi_detail(mock_api_client, mock_router):
+    """A failed request is raised with the API's own `errors[].detail` message.
+
+    Tools relay this text straight to the model, so losing it turns an actionable
+    error into an opaque one.
+    """
+    mock_router.add(
+        "GET",
+        "/api/v1/findings/nope",
+        status=404,
+        json=jsonapi_error(404, "Not found."),
+    )
+
+    with pytest.raises(Exception, match=r"API request failed: 404 - Not found\."):
+        await mock_api_client.get("/findings/nope")
+
+
+def test_build_filter_params_normalises_types_for_the_api(mock_api_client):
+    """Booleans become lowercase strings, sequences become CSV, `None` is dropped."""
+    result = mock_api_client.build_filter_params(
+        {
+            "filter[muted]": True,
+            "filter[severity__in]": ["high", "critical"],
+            "filter[status]": None,
+            "page[size]": 50,
+        }
+    )
+
+    assert result == {
+        "filter[muted]": "true",
+        "filter[severity__in]": "high,critical",
+        "page[size]": 50,
+    }
+
+
+def test_the_api_client_is_a_singleton(isolated_api_client):
+    """Every tool must share one client so the HTTP connection pool is shared."""
+    assert isolated_api_client() is isolated_api_client()
@@ -0,0 +1,62 @@
+"""Tests for Prowler API authentication.
+
+Reference for later branches: ``ProwlerAppAuth`` resolves its ``mode`` and
+``base_url`` in default arguments, which Python evaluates once at module import.
+``monkeypatch.setenv`` therefore has no effect on them -- always pass ``mode=``
+and ``base_url=`` explicitly, as these tests do.
+"""
+
+import pytest
+
+from prowler_mcp_server.prowler_app.utils.auth import ProwlerAppAuth
+from tests.helpers.tokens import FAKE_API_KEY, MALFORMED_API_KEY, fake_jwt
+
+
+async def test_stdio_mode_reads_the_api_key_from_the_environment():
+    """In STDIO transport the key comes from the process environment."""
+    auth = ProwlerAppAuth(mode="stdio")
+
+    assert await auth.get_valid_token() == FAKE_API_KEY
+
+
+def test_stdio_mode_rejects_a_key_without_the_prowler_prefix(
+    monkeypatch: pytest.MonkeyPatch,
+):
+    """A key that is not `pk_`-prefixed is refused at construction.
+
+    Failing here rather than on the first API call is what turns a
+    misconfiguration into an immediate, readable startup error.
+    """
+    monkeypatch.setenv("PROWLER_API_KEY", MALFORMED_API_KEY)
+
+    with pytest.raises(ValueError, match="Prowler API key format is incorrect"):
+        ProwlerAppAuth(mode="stdio")
+
+
+async def test_http_mode_accepts_a_bearer_api_key(http_request_headers):
+    """In HTTP transport the token comes from the request's Authorization header."""
+    http_request_headers(authorization=f"Bearer {FAKE_API_KEY}")
+
+    auth = ProwlerAppAuth(mode="http")
+
+    assert await auth.get_valid_token() == FAKE_API_KEY
+
+
+async def test_http_mode_rejects_an_expired_jwt(http_request_headers):
+    """An expired JWT is refused locally instead of being forwarded to the API."""
+    http_request_headers(authorization=f"Bearer {fake_jwt(expires_in=-60)}")
+
+    auth = ProwlerAppAuth(mode="http")
+
+    with pytest.raises(ValueError, match="Token has expired"):
+        await auth.get_valid_token()
+
+
+def test_api_keys_and_jwts_use_different_authorization_schemes():
+    """Prowler API keys authenticate with `Api-Key`, JWTs with `Bearer`."""
+    auth = ProwlerAppAuth(mode="stdio")
+
+    assert auth.get_headers(FAKE_API_KEY)["Authorization"] == f"Api-Key {FAKE_API_KEY}"
+
+    jwt = fake_jwt()
+    assert auth.get_headers(jwt)["Authorization"] == f"Bearer {jwt}"
@@ -0,0 +1 @@
+"""Tests for the Prowler Documentation sub-server."""
@@ -0,0 +1 @@
+"""Tests for the Prowler Hub sub-server."""
@@ -1,16 +1,11 @@
 """Tests for the Prowler MCP Server health endpoint."""

-from starlette.testclient import TestClient
-
 from prowler_mcp_server import __version__
-from prowler_mcp_server.server import app


-def test_health_returns_ietf_pass_response():
+def test_health_returns_ietf_pass_response(health_client):
    """GET /health returns 200 with the IETF health-check body and headers."""
-    client = TestClient(app)
-
-    response = client.get("/health")
+    response = health_client.get("/health")

    assert response.status_code == 200
    assert response.headers["content-type"] == "application/health+json"
@@ -24,23 +19,19 @@ def test_health_returns_ietf_pass_response():
    }


-def test_health_release_id_matches_package_version():
+def test_health_release_id_matches_package_version(health_client):
    """The endpoint must surface the current package __version__ as releaseId.

    Drift between the response and the installed package would mislead any
    monitoring tool that uses releaseId to identify the running build.
    """
-    client = TestClient(app)
-
-    response = client.get("/health")
+    response = health_client.get("/health")

    assert response.json()["releaseId"] == __version__


-def test_health_rejects_non_get_methods():
+def test_health_rejects_non_get_methods(health_client):
    """The endpoint only exposes GET; other verbs return 405."""
-    client = TestClient(app)
-
-    response = client.post("/health")
+    response = health_client.post("/health")

    assert response.status_code == 405
@@ -0,0 +1,51 @@
+"""Tests for the mounted root MCP server.
+
+Reference for later branches: open the client inline with
+``async with Client(mcp_root_server)``. FastMCP warns against holding a client in
+a fixture because it causes hard-to-diagnose event-loop problems.
+"""
+
+from fastmcp import Client
+
+from tests.helpers.assertions import (
+    assert_namespaced,
+    assert_tool_contract,
+    tools_in_namespace,
+)
+
+
+async def test_every_sub_server_contributes_tools(mcp_root_server):
+    """Each of the three mounts must expose tools under its own namespace.
+
+    This is the guard against a silent startup failure. ``setup_main_server()``
+    wraps each mount in try/except and ``load_all_tools`` swallows per-tool
+    construction errors, so a sub-server that registers nothing is still logged as
+    "successfully mounted". The `prowler_*` namespace in particular collapses to
+    zero tools whenever the API key is missing when the module is first imported.
+    """
+    async with Client(mcp_root_server) as client:
+        tools = await client.list_tools()
+
+    assert tools_in_namespace(tools, "prowler_hub_"), "Prowler Hub registered no tools"
+    assert tools_in_namespace(tools, "prowler_docs_"), (
+        "Prowler Docs registered no tools"
+    )
+    assert tools_in_namespace(tools, "prowler_"), "Prowler App registered no tools"
+
+
+async def test_every_tool_is_namespaced(mcp_root_server):
+    """Tool names are a published interface; nothing may escape the namespaces."""
+    async with Client(mcp_root_server) as client:
+        tools = await client.list_tools()
+
+    for tool in tools:
+        assert_namespaced(tool)
+
+
+async def test_every_tool_and_parameter_is_described(mcp_root_server):
+    """Descriptions are the contract a model reads before calling a tool."""
+    async with Client(mcp_root_server) as client:
+        tools = await client.list_tools()
+
+    for tool in tools:
+        assert_tool_contract(tool)
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				`@@ -0,0 +1 @@`
				`Test foundation for the MCP server with shared fixtures, JSON:API builders, mocked HTTP transports and CI coverage reporting`
				`@@ -0,0 +1 @@`
				`"""Tests for the Prowler App sub-server."""`
				`@@ -0,0 +1 @@`
				`"""Tests for the Prowler App Pydantic models."""`
				`@@ -0,0 +1 @@`
				`"""Tests for the Prowler App shared utilities."""`
				`@@ -0,0 +1 @@`
				`"""Tests for the Prowler Documentation sub-server."""`
				`@@ -0,0 +1 @@`
				`"""Tests for the Prowler Hub sub-server."""`