From 1c6935307ca4055f68d78bd9389ab40f3562d861 Mon Sep 17 00:00:00 2001
From: Timothy Farrell <tim@thecookiejar.me>
Date: Thu, 23 Apr 2026 22:11:51 -0500
Subject: [PATCH] Add test suite

---
 pyproject.toml             |   8 ++
 tests/__init__.py          |   0
 tests/conftest.py          | 145 ++++++++++++++++++++++++++++
 tests/test_auth.py         | 189 +++++++++++++++++++++++++++++++++++++
 tests/test_endpoints.py    | 185 ++++++++++++++++++++++++++++++++++++
 tests/test_file_indexer.py | 154 ++++++++++++++++++++++++++++++
 tests/test_navigation.py   | 125 ++++++++++++++++++++++++
 tests/test_zip_indexer.py  | 121 ++++++++++++++++++++++++
 uv.lock                    | 102 +++++++++++++++++++-
 9 files changed, 1028 insertions(+), 1 deletion(-)
 create mode 100644 tests/__init__.py
 create mode 100644 tests/conftest.py
 create mode 100644 tests/test_auth.py
 create mode 100644 tests/test_endpoints.py
 create mode 100644 tests/test_file_indexer.py
 create mode 100644 tests/test_navigation.py
 create mode 100644 tests/test_zip_indexer.py

diff --git a/pyproject.toml b/pyproject.toml
index f828af4..4ba98e6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,11 @@ dev = [
     "ruff>=0.15.5",
 ]
 
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+
+testpaths = ["tests"]
+
 [tool.ruff]
 target-version = "py313"
 line-length = 100
@@ -28,5 +33,8 @@ quote-style = "double"
 
 [dependency-groups]
 dev = [
+    "httpx>=0.28.1",
+    "pytest>=9.0.3",
+    "pytest-asyncio>=1.3.0",
     "ruff>=0.15.5",
 ]
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..0eb6884
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,145 @@
+"""Shared fixtures for the test suite."""
+
+import argparse
+import zipfile
+from pathlib import Path
+from typing import Generator
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+import main
+
+
+def _reset_state() -> None:
+    """Reset all global state to defaults."""
+    main.file_mapping.clear()
+    main.indexers.clear()
+    main.expected_password = None
+
+
+@pytest.fixture(autouse=True)
+def reset_globals() -> Generator[None, None, None]:
+    """Reset global state before and after each test."""
+    _reset_state()
+    yield
+    _reset_state()
+
+
+@pytest.fixture
+def sample_files(tmp_path: Path) -> dict[str, Path]:
+    """Create a directory with sample files for testing.
+
+    Returns:
+        Dict mapping logical names to file paths.
+    """
+    subdir = tmp_path / "subdir"
+    subdir.mkdir()
+
+    files: dict[str, Path] = {}
+    files["root_file"] = tmp_path / "root.txt"
+    files["root_file"].write_text("root content")
+
+    files["sub_file"] = subdir / "nested.txt"
+    files["sub_file"].write_text("nested content")
+
+    files["binary_file"] = tmp_path / "data.bin"
+    files["binary_file"].write_bytes(b"\x00\x01\x02\x03")
+
+    files["image_file"] = tmp_path / "photo.jpg"
+    files["image_file"].write_bytes(b"\xff\xd8\xff\xe0fake_jpeg_data")
+
+    return files
+
+
+@pytest.fixture
+def sample_zip(tmp_path: Path) -> dict[str, Path]:
+    """Create a ZIP file with sample files for testing.
+
+    Returns:
+        Dict mapping logical names to file paths inside the zip.
+    """
+    zip_path = tmp_path / "test_archive.zip"
+    inner_files: dict[str, Path] = {}
+
+    with zipfile.ZipFile(zip_path, "w") as zf:
+        zf.writestr("top.txt", "top level content")
+        inner_files["top"] = Path("top.txt")
+
+        zf.writestr("folder/deep.txt", "deep content")
+        inner_files["deep"] = Path("folder/deep.txt")
+
+        zf.writestr("folder/image.png", b"\x89PNG fake png")
+        inner_files["image"] = Path("folder/image.png")
+
+    return inner_files
+
+
+@pytest.fixture
+def args_directory(sample_files: dict[str, Path], tmp_path: Path) -> argparse.Namespace:
+    """Argparse namespace pointing at the sample directory."""
+    return argparse.Namespace(
+        source=str(tmp_path),
+        host="127.0.0.1",
+        port=0,
+        salt="test-salt",
+        password=None,
+    )
+
+
+@pytest.fixture
+def args_zip(sample_zip: dict[str, Path], tmp_path: Path) -> argparse.Namespace:
+    """Argparse namespace pointing at the sample zip."""
+    return argparse.Namespace(
+        source=str(tmp_path / "test_archive.zip"),
+        host="127.0.0.1",
+        port=0,
+        salt="test-salt",
+        password=None,
+    )
+
+
+@pytest.fixture
+def initialized_dir(args_directory: argparse.Namespace) -> None:
+    """Initialize the server with sample directory files (no auth)."""
+    main.initialize_server(args_directory)
+    main.set_auth_password(None)
+
+
+@pytest.fixture
+def initialized_zip(args_zip: argparse.Namespace) -> None:
+    """Initialize the server with sample zip files (no auth)."""
+    main.initialize_server(args_zip)
+    main.set_auth_password(None)
+
+
+def _dummy_auth_header() -> str:
+    """Create a dummy Basic Auth header (any creds work when no password is set)."""
+    import base64
+
+    creds = "test:test"
+    return f"Basic {base64.b64encode(creds.encode()).decode()}"
+
+
+@pytest.fixture
+async def client_dir(initialized_dir: None) -> Generator[AsyncClient, None, None]:
+    """Async HTTP client against the app initialized with directory files.
+
+    Sends dummy auth headers since HTTPBasic() always requires them.
+    """
+    transport = ASGITransport(app=main.app)
+    async with AsyncClient(transport=transport, base_url="http://test") as ac:
+        ac.headers["Authorization"] = _dummy_auth_header()
+        yield ac
+
+
+@pytest.fixture
+async def client_zip(initialized_zip: None) -> Generator[AsyncClient, None, None]:
+    """Async HTTP client against the app initialized with zip files.
+
+    Sends dummy auth headers since HTTPBasic() always requires them.
+    """
+    transport = ASGITransport(app=main.app)
+    async with AsyncClient(transport=transport, base_url="http://test") as ac:
+        ac.headers["Authorization"] = _dummy_auth_header()
+        yield ac
diff --git a/tests/test_auth.py b/tests/test_auth.py
new file mode 100644
index 0000000..dd5eb62
--- /dev/null
+++ b/tests/test_auth.py
@@ -0,0 +1,189 @@
+"""Tests for authentication."""
+
+import argparse
+import base64
+from pathlib import Path
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+import main
+
+
+def _basic_auth_header(username: str, password: str) -> str:
+    """Create a Basic Auth header value."""
+    creds = f"{username}:{password}"
+    return f"Basic {base64.b64encode(creds.encode()).decode()}"
+
+
+def _make_args(tmp_path: Path) -> argparse.Namespace:
+    """Create an argparse.Namespace for the given path."""
+    return argparse.Namespace(
+        source=str(tmp_path),
+        host="127.0.0.1",
+        port=0,
+        salt="auth-salt",
+        password=None,
+    )
+
+
+@pytest.fixture
+def auth_setup(tmp_path: Path) -> tuple[str, str]:
+    """Set up server with sample files and password protection.
+
+    Returns:
+        Tuple of (username, password).
+    """
+    (tmp_path / "test.txt").write_text("hello")
+    main.initialize_server(_make_args(tmp_path))
+    main.set_auth_password("secret123")
+    return ("user", "secret123")
+
+
+class TestNoPasswordSet:
+    """Tests when no password is configured.
+
+    Note: HTTPBasic() always requires an Authorization header.
+    When expected_password is None, any credentials pass.
+    """
+
+    async def test_health_always_open(self, client_dir: AsyncClient) -> None:
+        """Health check has no auth dependency — always accessible."""
+        response = await client_dir.get("/api/health")
+        assert response.status_code == 200
+
+    async def test_protected_endpoint_requires_auth_header(
+        self, initialized_dir: None
+    ) -> None:
+        """Even with no password, HTTPBasic requires an auth header."""
+        file_hash = list(main.file_mapping.keys())[0]
+        # No auth header → 401 from HTTPBasic
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 401
+
+    async def test_any_credentials_pass_when_no_password(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """Any credentials pass when no password is set."""
+        file_hash = list(main.file_mapping.keys())[0]
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header("any", "thing")
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 200
+
+    async def test_root_requires_auth_header(self, initialized_dir: None) -> None:
+        """Root endpoint requires auth header even with no password."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            response = await ac.get("/", follow_redirects=False)
+            assert response.status_code == 401
+
+
+class TestCorrectPassword:
+    """Tests with correct password."""
+
+    async def test_health_with_correct_password(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """Health check works (it has no auth, always 200)."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            response = await ac.get("/api/health")
+            assert response.status_code == 200
+
+    async def test_file_access_with_correct_password(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """File access works with correct password."""
+        username, password = auth_setup
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header(username, password)
+            file_hash = list(main.file_mapping.keys())[0]
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 200
+
+    async def test_root_with_correct_password(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """Root redirect works with correct password."""
+        username, password = auth_setup
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header(username, password)
+            response = await ac.get("/", follow_redirects=False)
+            assert response.status_code in (307, 302, 301)
+
+    async def test_hash_page_with_correct_password(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """Hash page works with correct password."""
+        username, password = auth_setup
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header(username, password)
+            file_hash = list(main.file_mapping.keys())[0]
+            response = await ac.get(f"/{file_hash}")
+            assert response.status_code == 200
+
+
+class TestWrongPassword:
+    """Tests with incorrect password."""
+
+    async def test_file_access_with_wrong_password(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """File access returns 401 with wrong password."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header("user", "wrong")
+            file_hash = list(main.file_mapping.keys())[0]
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 401
+
+    async def test_root_with_wrong_password(self, auth_setup: tuple[str, str]) -> None:
+        """Root redirect returns 401 with wrong password."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            ac.headers["Authorization"] = _basic_auth_header("user", "wrong")
+            response = await ac.get("/", follow_redirects=False)
+            assert response.status_code == 401
+
+    async def test_no_auth_header_returns_401(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """Missing auth header returns 401."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            file_hash = list(main.file_mapping.keys())[0]
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 401
+
+    async def test_includes_www_authenticate_header(
+        self, auth_setup: tuple[str, str]
+    ) -> None:
+        """401 response includes WWW-Authenticate header."""
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            file_hash = list(main.file_mapping.keys())[0]
+            response = await ac.get(f"/api/{file_hash}/data")
+            assert response.status_code == 401
+            assert "www-authenticate" in response.headers
+
+
+class TestSetAuthPassword:
+    """Tests for set_auth_password function."""
+
+    def test_sets_password(self) -> None:
+        """Password is set correctly."""
+        main.set_auth_password("newpass")
+        assert main.expected_password == "newpass"
+
+    def test_clears_password_with_none(self) -> None:
+        """Passing None clears the password."""
+        main.set_auth_password("something")
+        main.set_auth_password(None)
+        assert main.expected_password is None
diff --git a/tests/test_endpoints.py b/tests/test_endpoints.py
new file mode 100644
index 0000000..0198043
--- /dev/null
+++ b/tests/test_endpoints.py
@@ -0,0 +1,185 @@
+"""Tests for FastAPI endpoints."""
+
+import pytest
+from httpx import AsyncClient
+
+import main
+
+
+class TestHealthCheck:
+    """Tests for GET /api/health."""
+
+    async def test_returns_200(self, client_dir: AsyncClient) -> None:
+        """Health endpoint returns 200 OK."""
+        response = await client_dir.get("/api/health")
+        assert response.status_code == 200
+
+    async def test_returns_file_count(self, client_dir: AsyncClient) -> None:
+        """Health endpoint reports correct file count."""
+        response = await client_dir.get("/api/health")
+        data = response.json()
+        assert data["status"] == "healthy"
+        assert data["file_count"] == len(main.file_mapping)
+
+    async def test_returns_zero_when_empty(self) -> None:
+        """Health endpoint returns 0 when no files are indexed."""
+        main.file_mapping.clear()
+        from httpx import ASGITransport
+
+        transport = ASGITransport(app=main.app)
+        async with AsyncClient(transport=transport, base_url="http://test") as ac:
+            response = await ac.get("/api/health")
+            data = response.json()
+            assert data["file_count"] == 0
+
+
+class TestGetFileData:
+    """Tests for GET /api/{file_hash}/data."""
+
+    async def test_returns_file_content(self, client_dir: AsyncClient) -> None:
+        """Returns the content of a valid file."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/api/{file_hash}/data")
+        assert response.status_code == 200
+        assert len(response.content) > 0
+
+    async def test_returns_correct_content_type_for_text(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """Text files get text/plain content type."""
+        # Find a .txt file hash
+        for file_hash, filepath in main.file_mapping.items():
+            if filepath.endswith(".txt"):
+                response = await client_dir.get(f"/api/{file_hash}/data")
+                assert response.status_code == 200
+                assert "text/plain" in response.headers["content-type"]
+                break
+
+    async def test_returns_correct_content_type_for_image(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """Image files get appropriate content type."""
+        for file_hash, filepath in main.file_mapping.items():
+            if filepath.endswith(".jpg"):
+                response = await client_dir.get(f"/api/{file_hash}/data")
+                assert response.status_code == 200
+                assert "image/jpeg" in response.headers["content-type"]
+                break
+
+    async def test_returns_404_for_invalid_hash(self, client_dir: AsyncClient) -> None:
+        """Returns 404 for a hash that doesn't exist."""
+        response = await client_dir.get("/api/nonexistent-hash/data")
+        assert response.status_code == 404
+
+    async def test_has_content_disposition_header(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """Response includes Content-Disposition header."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/api/{file_hash}/data")
+        assert "content-disposition" in response.headers
+        assert "inline" in response.headers["content-disposition"]
+
+    async def test_zip_file_content(self, client_zip: AsyncClient) -> None:
+        """Files from a zip archive are served correctly."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_zip.get(f"/api/{file_hash}/data")
+        assert response.status_code == 200
+        assert len(response.content) > 0
+
+
+class TestRootRedirect:
+    """Tests for GET /."""
+
+    async def test_redirects_to_random_hash(self, client_dir: AsyncClient) -> None:
+        """Root redirects (307) to a random file hash page."""
+        response = await client_dir.get("/", follow_redirects=False)
+        assert response.status_code in (307, 302, 301)
+        location = response.headers["location"]
+        # Location should be a hash in the mapping
+        hash_from_url = location.lstrip("/")
+        assert hash_from_url in main.file_mapping
+
+
+class TestOrderDelayRoute:
+    """Tests for GET /{order}/{delay}."""
+
+    async def test_next_order_redirects(self, client_dir: AsyncClient) -> None:
+        """/next/5 redirects to /next/5/{hash}."""
+        response = await client_dir.get("/next/5", follow_redirects=False)
+        assert response.status_code in (307, 302, 301)
+        assert "/next/5/" in response.headers["location"]
+
+    async def test_random_order_redirects(self, client_dir: AsyncClient) -> None:
+        """/random/3 redirects to /random/3/{hash}."""
+        response = await client_dir.get("/random/3", follow_redirects=False)
+        assert response.status_code in (307, 302, 301)
+        assert "/random/3/" in response.headers["location"]
+
+
+class TestHashPage:
+    """Tests for GET /{file_hash}."""
+
+    async def test_returns_html_page(self, client_dir: AsyncClient) -> None:
+        """Returns an HTML page for a valid file hash."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/{file_hash}")
+        assert response.status_code == 200
+        assert "text/html" in response.headers["content-type"]
+
+    async def test_page_contains_image_url(self, client_dir: AsyncClient) -> None:
+        """HTML page contains the image URL."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/{file_hash}")
+        assert f"/api/{file_hash}/data" in response.text
+
+    async def test_page_contains_prev_next_buttons(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """HTML page contains prev and next navigation."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/{file_hash}")
+        assert 'class="chevron left"' in response.text
+        assert 'class="chevron right"' in response.text
+
+    async def test_returns_404_for_invalid_hash(self, client_dir: AsyncClient) -> None:
+        """Returns 404 for a hash that doesn't exist."""
+        response = await client_dir.get("/nonexistent-hash")
+        assert response.status_code == 404
+
+
+class TestHashPageWithRefresh:
+    """Tests for GET /{order}/{delay}/{file_hash}."""
+
+    async def test_next_order_returns_html(self, client_dir: AsyncClient) -> None:
+        """Next order returns HTML with refresh meta tag."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/next/5/{file_hash}")
+        assert response.status_code == 200
+        assert 'http-equiv="refresh"' in response.text
+
+    async def test_random_order_returns_html(self, client_dir: AsyncClient) -> None:
+        """Random order returns HTML with refresh meta tag."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/random/3/{file_hash}")
+        assert response.status_code == 200
+        assert 'http-equiv="refresh"' in response.text
+
+    async def test_invalid_order_returns_400(self, client_dir: AsyncClient) -> None:
+        """Invalid order parameter returns 400."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/shuffle/5/{file_hash}")
+        assert response.status_code == 400
+
+    async def test_returns_404_for_invalid_hash(self, client_dir: AsyncClient) -> None:
+        """Returns 404 for a hash that doesn't exist."""
+        response = await client_dir.get("/next/5/nonexistent-hash")
+        assert response.status_code == 404
+
+    async def test_refresh_url_points_to_next_file(
+        self, client_dir: AsyncClient
+    ) -> None:
+        """Refresh meta tag points to the next file in sequence."""
+        file_hash = list(main.file_mapping.keys())[0]
+        response = await client_dir.get(f"/next/5/{file_hash}")
+        assert "url=/next/5/" in response.text
diff --git a/tests/test_file_indexer.py b/tests/test_file_indexer.py
new file mode 100644
index 0000000..23ae171
--- /dev/null
+++ b/tests/test_file_indexer.py
@@ -0,0 +1,154 @@
+"""Tests for the FileIndexer class."""
+
+import hashlib
+from pathlib import Path
+
+import pytest
+
+from main import FileIndexer
+
+
+class TestHashPath:
+    """Tests for FileIndexer._hash_path."""
+
+    def test_consistent_hash_with_same_salt(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Hash is deterministic when salt is fixed."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="fixed")
+        path = str(sample_files["root_file"])
+        hash1 = indexer._hash_path(path)
+        hash2 = indexer._hash_path(path)
+        assert hash1 == hash2
+
+    def test_different_hash_with_different_salt(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Different salts produce different hashes for the same path."""
+        indexer1 = FileIndexer(str(sample_files["root_file"].parent), salt="salt-a")
+        indexer2 = FileIndexer(str(sample_files["root_file"].parent), salt="salt-b")
+        path = str(sample_files["root_file"])
+        assert indexer1._hash_path(path) != indexer2._hash_path(path)
+
+    def test_different_hash_for_different_paths(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Different paths produce different hashes."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="fixed")
+        hash1 = indexer._hash_path(str(sample_files["root_file"]))
+        hash2 = indexer._hash_path(str(sample_files["sub_file"]))
+        assert hash1 != hash2
+
+    def test_hash_is_sha256_hex(self, sample_files: dict[str, Path]) -> None:
+        """Hash output is a 64-character hex string (SHA-256)."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="fixed")
+        path = str(sample_files["root_file"])
+        result = indexer._hash_path(path)
+        assert len(result) == 64
+        assert all(c in "0123456789abcdef" for c in result)
+
+    def test_hash_includes_salt(self, sample_files: dict[str, Path]) -> None:
+        """Hash is computed from path + salt concatenated."""
+        salt = "mysalt"
+        path = "/some/file.txt"
+        expected = hashlib.sha256((path + salt).encode()).hexdigest()
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt=salt)
+        assert indexer._hash_path(path) == expected
+
+
+class TestSalt:
+    """Tests for FileIndexer.salt property."""
+
+    def test_provided_salt_is_returned(self, sample_files: dict[str, Path]) -> None:
+        """Explicitly provided salt is returned unchanged."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="explicit")
+        assert indexer.salt == "explicit"
+
+    def test_none_salt_generates_random(self, sample_files: dict[str, Path]) -> None:
+        """None salt generates a random hex string."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt=None)
+        salt = indexer.salt
+        assert salt is not None
+        assert len(salt) == 32  # secrets.token_hex(16) = 32 hex chars
+        assert all(c in "0123456789abcdef" for c in salt)
+
+    def test_salt_is_stable_after_first_access(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Salt doesn't change between accesses."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt=None)
+        first = indexer.salt
+        second = indexer.salt
+        assert first == second
+
+
+class TestIndex:
+    """Tests for FileIndexer._index and indexing behavior."""
+
+    def test_indexes_all_files(self, sample_files: dict[str, Path]) -> None:
+        """All files in the directory tree are indexed."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        assert (
+            len(indexer._file_mapping) == 4
+        )  # root.txt, nested.txt, data.bin, photo.jpg
+
+    def test_hash_maps_to_correct_path(self, sample_files: dict[str, Path]) -> None:
+        """Each hash maps to the correct file path."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        expected_hash = indexer._hash_path(str(sample_files["root_file"]))
+        assert indexer._file_mapping[expected_hash] == str(sample_files["root_file"])
+
+    def test_empty_directory(self, tmp_path: Path) -> None:
+        """Empty directory produces an empty mapping."""
+        indexer = FileIndexer(str(tmp_path), salt="test")
+        assert indexer._file_mapping == {}
+
+    def test_nested_directories(self, sample_files: dict[str, Path]) -> None:
+        """Files in subdirectories are included."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        sub_hash = indexer._hash_path(str(sample_files["sub_file"]))
+        assert sub_hash in indexer._file_mapping
+
+
+class TestGetFileByHash:
+    """Tests for FileIndexer.get_file_by_hash."""
+
+    def test_returns_file_content(self, sample_files: dict[str, Path]) -> None:
+        """Returns the binary content of the file."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        file_hash = indexer._hash_path(str(sample_files["root_file"]))
+        content = b"".join(indexer.get_file_by_hash(file_hash))
+        assert content == b"root content"
+
+    def test_returns_empty_for_invalid_hash(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Returns an empty generator for a hash that doesn't exist."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        content = b"".join(indexer.get_file_by_hash("nonexistent"))
+        assert content == b""
+
+    def test_returns_binary_content_correctly(
+        self, sample_files: dict[str, Path]
+    ) -> None:
+        """Binary file content is returned byte-for-byte."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        file_hash = indexer._hash_path(str(sample_files["binary_file"]))
+        content = b"".join(indexer.get_file_by_hash(file_hash))
+        assert content == b"\x00\x01\x02\x03"
+
+
+class TestGetFilenameByHash:
+    """Tests for FileIndexer.get_filename_by_hash."""
+
+    def test_returns_filename(self, sample_files: dict[str, Path]) -> None:
+        """Returns the full file path for a valid hash."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        file_hash = indexer._hash_path(str(sample_files["root_file"]))
+        result = indexer.get_filename_by_hash(file_hash)
+        assert result == str(sample_files["root_file"])
+
+    def test_returns_none_for_invalid_hash(self, sample_files: dict[str, Path]) -> None:
+        """Returns None for a hash that doesn't exist."""
+        indexer = FileIndexer(str(sample_files["root_file"].parent), salt="test")
+        assert indexer.get_filename_by_hash("nonexistent") is None
diff --git a/tests/test_navigation.py b/tests/test_navigation.py
new file mode 100644
index 0000000..4ca0583
--- /dev/null
+++ b/tests/test_navigation.py
@@ -0,0 +1,125 @@
+"""Tests for navigation helper functions."""
+
+import argparse
+from pathlib import Path
+
+import pytest
+
+import main
+
+
+@pytest.fixture
+def seeded_indexers(sample_files: dict[str, Path], tmp_path: Path) -> None:
+    """Initialize with a fixed salt so hashes are predictable."""
+    args = argparse.Namespace(
+        source=str(tmp_path),
+        host="127.0.0.1",
+        port=0,
+        salt="nav-test-salt",
+        password=None,
+    )
+    main.initialize_server(args)
+
+
+class TestGetNavigationData:
+    """Tests for _get_navigation_data."""
+
+    def test_returns_all_keys(self, seeded_indexers: None) -> None:
+        """Navigation data contains all required keys."""
+        file_hash = list(main.file_mapping.keys())[0]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert "file_hash" in data
+        assert "next_hash" in data
+        assert "prev_hash" in data
+        assert "filename" in data
+
+    def test_file_hash_matches_input(self, seeded_indexers: None) -> None:
+        """Returned file_hash matches the input."""
+        file_hash = list(main.file_mapping.keys())[0]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert data["file_hash"] == file_hash
+
+    def test_sequential_next_and_prev(self, seeded_indexers: None) -> None:
+        """In sequential mode, next and prev are adjacent in the list."""
+        keys = list(main.file_mapping.keys())
+        if len(keys) < 2:
+            pytest.skip("Need at least 2 files for sequential navigation")
+        file_hash = keys[0]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert data["next_hash"] == keys[1]
+        # First item's prev wraps to last
+        assert data["prev_hash"] == keys[-1]
+
+    def test_middle_item_navigation(self, seeded_indexers: None) -> None:
+        """Middle item has correct prev and next."""
+        keys = list(main.file_mapping.keys())
+        if len(keys) < 3:
+            pytest.skip("Need at least 3 files for middle-item test")
+        mid_idx = len(keys) // 2
+        file_hash = keys[mid_idx]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert data["next_hash"] == keys[mid_idx + 1]
+        assert data["prev_hash"] == keys[mid_idx - 1]
+
+    def test_last_item_wraps_next(self, seeded_indexers: None) -> None:
+        """Last item's next wraps to the first item."""
+        keys = list(main.file_mapping.keys())
+        if len(keys) < 2:
+            pytest.skip("Need at least 2 files for wrap test")
+        file_hash = keys[-1]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert data["next_hash"] == keys[0]
+
+    def test_random_order_returns_different_hashes(self, seeded_indexers: None) -> None:
+        """Random order returns hashes that may differ from current."""
+        keys = list(main.file_mapping.keys())
+        if len(keys) < 3:
+            pytest.skip("Need at least 3 files for random test")
+        file_hash = keys[0]
+        data = main._get_navigation_data(file_hash, order="random")
+        # next and prev should be random (not necessarily adjacent)
+        assert data["next_hash"] in keys
+        assert data["prev_hash"] in keys
+
+    def test_filename_is_returned(self, seeded_indexers: None) -> None:
+        """Filename is populated from the indexer."""
+        file_hash = list(main.file_mapping.keys())[0]
+        data = main._get_navigation_data(file_hash, order=None)
+        assert data["filename"] is not None
+        assert isinstance(data["filename"], str)
+
+
+class TestGetRandomHash:
+    """Tests for _get_random_hash."""
+
+    def test_returns_valid_hash(self, seeded_indexers: None) -> None:
+        """Returns a hash that exists in the mapping."""
+        random_hash = main._get_random_hash()
+        assert random_hash in main.file_mapping
+
+    def test_raises_when_empty(self) -> None:
+        """Raises HTTPException when no files are indexed."""
+        main.file_mapping.clear()
+        with pytest.raises(main.HTTPException) as exc_info:
+            main._get_random_hash()
+        assert exc_info.value.status_code == 404
+
+
+class TestFindIndexerForHash:
+    """Tests for _find_indexer_for_hash."""
+
+    def test_finds_correct_indexer(self, seeded_indexers: None) -> None:
+        """Returns the indexer containing the given hash."""
+        file_hash = list(main.file_mapping.keys())[0]
+        indexer = main._find_indexer_for_hash(file_hash)
+        assert indexer is not None
+        assert file_hash in indexer._file_mapping
+
+    def test_returns_none_for_unknown_hash(self, seeded_indexers: None) -> None:
+        """Returns None for a hash not in any indexer."""
+        assert main._find_indexer_for_hash("nonexistent") is None
+
+    def test_returns_none_when_no_indexers(self) -> None:
+        """Returns None when no indexers are registered."""
+        main.indexers.clear()
+        assert main._find_indexer_for_hash("any-hash") is None
diff --git a/tests/test_zip_indexer.py b/tests/test_zip_indexer.py
new file mode 100644
index 0000000..7140b39
--- /dev/null
+++ b/tests/test_zip_indexer.py
@@ -0,0 +1,121 @@
+"""Tests for the ZipFileIndexer class."""
+
+from pathlib import Path
+
+import pytest
+
+from main import ZipFileIndexer
+
+
+class TestZipIndex:
+    """Tests for ZipFileIndexer._index."""
+
+    def test_indexes_real_zip(self, tmp_path: Path) -> None:
+        """Index a real zip file with multiple entries."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("a.txt", "aaa")
+            zf.writestr("b/c.txt", "ccc")
+            zf.writestr("b/d.txt", "ddd")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        assert len(indexer._file_mapping) == 3
+
+    def test_excludes_directories(self, tmp_path: Path) -> None:
+        """Directory entries in the zip are excluded from the index."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("folder/", "")  # directory entry
+            zf.writestr("folder/file.txt", "content")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        assert len(indexer._file_mapping) == 1
+        filename = list(indexer._file_mapping.values())[0]
+        assert filename == "folder/file.txt"
+
+    def test_hash_matches_filename(self, tmp_path: Path) -> None:
+        """Hash is computed from the filename inside the zip."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("hello.txt", "world")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        expected_hash = indexer._hash_path("hello.txt")
+        assert expected_hash in indexer._file_mapping
+        assert indexer._file_mapping[expected_hash] == "hello.txt"
+
+
+class TestZipGetFileByHash:
+    """Tests for ZipFileIndexer.get_file_by_hash."""
+
+    def test_returns_file_content(self, tmp_path: Path) -> None:
+        """Returns the content of a file inside the zip."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("data.txt", "zip content here")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        file_hash = indexer._hash_path("data.txt")
+        content = b"".join(indexer.get_file_by_hash(file_hash))
+        assert content == b"zip content here"
+
+    def test_returns_empty_for_invalid_hash(self, tmp_path: Path) -> None:
+        """Returns an empty generator for a hash that doesn't exist in the zip."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("file.txt", "data")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        content = b"".join(indexer.get_file_by_hash("nonexistent-hash"))
+        assert content == b""
+
+    def test_returns_binary_content(self, tmp_path: Path) -> None:
+        """Binary content from zip is returned correctly."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        binary_data = b"\x00\xff\x80\x7f"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("binary.bin", binary_data)
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        file_hash = indexer._hash_path("binary.bin")
+        content = b"".join(indexer.get_file_by_hash(file_hash))
+        assert content == binary_data
+
+
+class TestZipGetFilenameByHash:
+    """Tests for ZipFileIndexer.get_filename_by_hash."""
+
+    def test_returns_filename(self, tmp_path: Path) -> None:
+        """Returns the internal filename for a valid hash."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("folder/nested.txt", "content")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        file_hash = indexer._hash_path("folder/nested.txt")
+        assert indexer.get_filename_by_hash(file_hash) == "folder/nested.txt"
+
+    def test_returns_none_for_invalid_hash(self, tmp_path: Path) -> None:
+        """Returns None for a hash that doesn't exist."""
+        import zipfile
+
+        zip_path = tmp_path / "archive.zip"
+        with zipfile.ZipFile(zip_path, "w") as zf:
+            zf.writestr("file.txt", "data")
+
+        indexer = ZipFileIndexer(str(zip_path), salt="test")
+        assert indexer.get_filename_by_hash("bad-hash") is None
diff --git a/uv.lock b/uv.lock
index eeafa79..9b8a7b3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -59,6 +59,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/8e/0d/52d98722666d6fc6c3dd4c76df339501d6efd40e0ff95e6186a7b7f0befd/black-26.3.1-py3-none-any.whl", hash = "sha256:2bd5aa94fc267d38bb21a70d7410a89f1a1d318841855f698746f8e7f51acd1b", size = 207542, upload-time = "2026-03-12T03:36:01.668Z" },
 ]
 
+[[package]]
+name = "certifi"
+version = "2026.4.22"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/25/ee/6caf7a40c36a1220410afe15a1cc64993a1f864871f698c0f93acb72842a/certifi-2026.4.22.tar.gz", hash = "sha256:8d455352a37b71bf76a79caa83a3d6c25afee4a385d632127b6afb3963f1c580", size = 137077, upload-time = "2026-04-22T11:26:11.191Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/22/30/7cd8fdcdfbc5b869528b079bfb76dcdf6056b1a2097a662e5e8c04f42965/certifi-2026.4.22-py3-none-any.whl", hash = "sha256:3cb2210c8f88ba2318d29b0388d1023c8492ff72ecdde4ebdaddbb13a31b1c4a", size = 135707, upload-time = "2026-04-22T11:26:09.372Z" },
+]
+
 [[package]]
 name = "click"
 version = "8.3.1"
@@ -112,6 +121,9 @@ dev = [
 
 [package.dev-dependencies]
 dev = [
+    { name = "httpx" },
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
     { name = "ruff" },
 ]
 
@@ -125,7 +137,12 @@ requires-dist = [
 provides-extras = ["dev"]
 
 [package.metadata.requires-dev]
-dev = [{ name = "ruff", specifier = ">=0.15.5" }]
+dev = [
+    { name = "httpx", specifier = ">=0.28.1" },
+    { name = "pytest", specifier = ">=9.0.3" },
+    { name = "pytest-asyncio", specifier = ">=1.3.0" },
+    { name = "ruff", specifier = ">=0.15.5" },
+]
 
 [[package]]
 name = "h11"
@@ -136,6 +153,34 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl", hash = "sha256:63cf8bbe7522de3bf65932fda1d9c2772064ffb3dae62d55932da54b31cb6c86", size = 37515, upload-time = "2025-04-24T03:35:24.344Z" },
 ]
 
+[[package]]
+name = "httpcore"
+version = "1.0.9"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "certifi" },
+    { name = "h11" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/06/94/82699a10bca87a5556c9c59b5963f2d039dbd239f25bc2a63907a05a14cb/httpcore-1.0.9.tar.gz", hash = "sha256:6e34463af53fd2ab5d807f399a9b45ea31c3dfa2276f15a2c3f00afff6e176e8", size = 85484, upload-time = "2025-04-24T22:06:22.219Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7e/f5/f66802a942d491edb555dd61e3a9961140fd64c90bce1eafd741609d334d/httpcore-1.0.9-py3-none-any.whl", hash = "sha256:2d400746a40668fc9dec9810239072b40b4484b640a8c38fd654a024c7a1bf55", size = 78784, upload-time = "2025-04-24T22:06:20.566Z" },
+]
+
+[[package]]
+name = "httpx"
+version = "0.28.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "anyio" },
+    { name = "certifi" },
+    { name = "httpcore" },
+    { name = "idna" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/b1/df/48c586a5fe32a0f01324ee087459e112ebb7224f646c0b5023f5e79e9956/httpx-0.28.1.tar.gz", hash = "sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc", size = 141406, upload-time = "2024-12-06T15:37:23.222Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/2a/39/e50c7c3a983047577ee07d2a9e53faf5a69493943ec3f6a384bdc792deb2/httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad", size = 73517, upload-time = "2024-12-06T15:37:21.509Z" },
+]
+
 [[package]]
 name = "idna"
 version = "3.11"
@@ -145,6 +190,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/0e/61/66938bbb5fc52dbdf84594873d5b51fb1f7c7794e9c0f5bd885f30bc507b/idna-3.11-py3-none-any.whl", hash = "sha256:771a87f49d9defaf64091e6e6fe9c18d4833f140bd19464795bc32d966ca37ea", size = 71008, upload-time = "2025-10-12T14:55:18.883Z" },
 ]
 
+[[package]]
+name = "iniconfig"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/72/34/14ca021ce8e5dfedc35312d08ba8bf51fdd999c576889fc2c24cb97f4f10/iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730", size = 20503, upload-time = "2025-10-18T21:55:43.219Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/cb/b1/3846dd7f199d53cb17f49cba7e651e9ce294d8497c8c150530ed11865bb8/iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12", size = 7484, upload-time = "2025-10-18T21:55:41.639Z" },
+]
+
 [[package]]
 name = "mypy-extensions"
 version = "1.1.0"
@@ -181,6 +235,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/75/a6/a0a304dc33b49145b21f4808d763822111e67d1c3a32b524a1baf947b6e1/platformdirs-4.9.6-py3-none-any.whl", hash = "sha256:e61adb1d5e5cb3441b4b7710bea7e4c12250ca49439228cc1021c00dcfac0917", size = 21348, upload-time = "2026-04-09T00:04:09.463Z" },
 ]
 
+[[package]]
+name = "pluggy"
+version = "1.6.0"
+source = { registry = "https://pypi.org/simple" }
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