test: Add health endpoint and version retrieval tests

Author: Zzackllack

tests/test_health.py

@@ -0,0 +1,5 @@
+def test_health_endpoint(client):
+    r = client.get("/health")
+    assert r.status_code == 200
+    assert r.json().get("status") == "ok"
+

tests/test_version.py

@@ -0,0 +1,44 @@
+import importlib
+from pathlib import Path
+
+
+def test_get_version_uses_package_metadata(monkeypatch):
+    # Force VERSION file to be treated as missing
+    orig_exists = Path.exists
+
+    def fake_exists(self):  # type: ignore[no-redef]
+        return False if self.name == "VERSION" else orig_exists(self)
+
+    monkeypatch.setattr(Path, "exists", fake_exists, raising=False)
+
+    # Patch importlib.metadata.version to return a known value
+    import importlib.metadata as im
+
+    monkeypatch.setattr(im, "version", lambda name: "9.9.9")
+
+    from app import _version as ver
+
+    assert ver.get_version() == "9.9.9"
+
+
+def test_get_version_fallback_to_default(monkeypatch):
+    # Force VERSION file to be treated as missing
+    orig_exists = Path.exists
+
+    def fake_exists(self):  # type: ignore[no-redef]
+        return False if self.name == "VERSION" else orig_exists(self)
+
+    monkeypatch.setattr(Path, "exists", fake_exists, raising=False)
+
+    # Patch importlib.metadata.version to raise, triggering default fallback
+    import importlib.metadata as im
+
+    def raise_err(_):
+        raise RuntimeError("no package metadata")
+
+    monkeypatch.setattr(im, "version", raise_err)
+
+    from app import _version as ver
+
+    assert ver.get_version() == "0.0.0"
+