[tests] Add tests for the context processor

tests/test_context_processors.py

@@ -0,0 +1,85 @@
+import os
+from unittest.mock import patch, MagicMock
+from pathlib import Path
+
+import pytest
+from vrobbler.context_processors import version_info
+
+
+@pytest.fixture
+def mock_request():
+    return MagicMock()
+
+
+class TestVersionInfo:
+    def test_returns_version_and_commit(self, mock_request):
+        with (
+            patch("vrobbler.context_processors.get_version") as mock_get_version,
+            patch(
+                "vrobbler.context_processors.subprocess.check_output"
+            ) as mock_check_output,
+        ):
+            mock_get_version.return_value = "1.0.0"
+            mock_check_output.return_value = b"abc1234"
+
+            result = version_info(mock_request)
+
+            assert result["app_version"] == "1.0.0"
+            assert result["git_commit"] == "abc1234"
+
+    def test_uses_env_commit_if_set(self, mock_request):
+        with (
+            patch.dict(os.environ, {"VROBBLER_COMMIT": "env_commit_hash"}),
+            patch("vrobbler.context_processors.get_version") as mock_get_version,
+        ):
+            mock_get_version.return_value = "1.0.0"
+
+            result = version_info(mock_request)
+
+            assert result["git_commit"] == "env_commit_hash"
+
+    def test_returns_unknown_when_version_fails(self, mock_request):
+        with (
+            patch("vrobbler.context_processors.get_version") as mock_get_version,
+            patch(
+                "vrobbler.context_processors.subprocess.check_output"
+            ) as mock_check_output,
+        ):
+            mock_get_version.side_effect = Exception("not found")
+            mock_check_output.return_value = b"abc1234"
+
+            result = version_info(mock_request)
+
+            assert result["app_version"] == "unknown"
+
+    def test_returns_unknown_when_git_fails(self, mock_request):
+        import subprocess
+
+        with (
+            patch("vrobbler.context_processors.get_version") as mock_get_version,
+            patch(
+                "vrobbler.context_processors.subprocess.check_output"
+            ) as mock_check_output,
+        ):
+            mock_get_version.return_value = "1.0.0"
+            mock_check_output.side_effect = subprocess.SubprocessError()
+
+            result = version_info(mock_request)
+
+            assert result["git_commit"] == "unknown"
+
+    def test_returns_unknown_when_git_not_found(self, mock_request):
+        import subprocess
+
+        with (
+            patch("vrobbler.context_processors.get_version") as mock_get_version,
+            patch(
+                "vrobbler.context_processors.subprocess.check_output"
+            ) as mock_check_output,
+        ):
+            mock_get_version.return_value = "1.0.0"
+            mock_check_output.side_effect = FileNotFoundError()
+
+            result = version_info(mock_request)
+
+            assert result["git_commit"] == "unknown"