updates to instructions

Author: eleanorjboyd

.github/instructions/testing-workflow.instructions.md

@@ -537,6 +537,22 @@ envConfig.inspect
 -   ❌ Tests that don't clean up mocks properly
 -   ❌ Overly complex test setup that's hard to understand
 
+## 🔄 Reviewing and Improving Existing Tests
+
+### Quick Review Process
+
+1. **Read test files** - Check structure and mock setup
+2. **Run tests** - Establish baseline functionality
+3. **Apply improvements** - Use patterns below
+4. **Verify** - Ensure tests still pass
+
+### Common Fixes
+
+-   Over-complex mocks → Minimal mocks with only needed methods
+-   Brittle assertions → Behavior-focused with error messages
+-   Vague test names → Clear scenario descriptions
+-   Missing structure → Mock → Run → Assert pattern
+
 ## 🧠 Agent Learnings
 
 -   Always use dynamic path construction with Node.js `path` module when testing functions that resolve paths against workspace folders to ensure cross-platform compatibility (1)
@@ -550,3 +566,5 @@ envConfig.inspect
 -   Create proxy abstraction functions for Node.js APIs like `cp.spawn` to enable clean testing - use function overloads to preserve Node.js's intelligent typing while making the functions mockable (1)
 -   When unit tests fail with VS Code API errors like `TypeError: X is not a constructor` or `Cannot read properties of undefined (reading 'Y')`, check if VS Code APIs are properly mocked in `/src/test/unittests.ts` - add missing Task-related APIs (`Task`, `TaskScope`, `ShellExecution`, `TaskRevealKind`, `TaskPanelKind`) and namespace mocks (`tasks`) following the existing pattern of `mockedVSCode.X = vscodeMocks.vscMockExtHostedTypes.X` (1)
 -   Create minimal mock objects with only required methods and use TypeScript type assertions (e.g., mockApi as PythonEnvironmentApi) to satisfy interface requirements instead of implementing all interface methods when only specific methods are needed for the test (1)
+-   When reviewing existing tests, focus on behavior rather than implementation details in test names and assertions - transform "should return X when Y" into "should [expected behavior] when [scenario context]" (1)
+-   Simplify mock setup by only mocking methods actually used in tests and use `as unknown as Type` for TypeScript compatibility (1)

src/test/managers/builtin/venvUtils.uvTracking.unit.test.ts

@@ -19,75 +19,109 @@ suite('venvUtils UV Environment Tracking', () => {
     let getWorkspacePersistentStateStub: sinon.SinonStub;
 
     setup(() => {
+        // Create minimal mock state with only required methods
         mockState = {
             get: sinon.stub(),
             set: sinon.stub(),
             clear: sinon.stub(),
         };
         getWorkspacePersistentStateStub = sinon.stub(persistentState, 'getWorkspacePersistentState');
-        getWorkspacePersistentStateStub.returns(Promise.resolve(mockState));
+        getWorkspacePersistentStateStub.resolves(mockState);
     });
 
     teardown(() => {
         sinon.restore();
     });
 
-    test('getUvEnvironments should return empty array when no environments stored', async () => {
+    test('should return empty array when no UV environments have been stored', async () => {
+        // Mock - No stored environments
         mockState.get.withArgs(UV_ENVS_KEY).resolves(undefined);
 
+        // Run
         const result = await getUvEnvironments();
-        assert.deepStrictEqual(result, []);
+
+        // Assert - Should return empty array for fresh state
+        assert.deepStrictEqual(result, [], 'Should return empty array when no environments stored');
     });
 
-    test('getUvEnvironments should return stored environments', async () => {
-        const expectedEnvs = ['/path/to/env1', '/path/to/env2'];
-        mockState.get.withArgs(UV_ENVS_KEY).resolves(expectedEnvs);
+    test('should return previously stored UV environments', async () => {
+        // Mock - Existing stored environments
+        const storedEnvs = ['/path/to/env1', '/path/to/env2'];
+        mockState.get.withArgs(UV_ENVS_KEY).resolves(storedEnvs);
 
+        // Run
         const result = await getUvEnvironments();
-        assert.deepStrictEqual(result, expectedEnvs);
+
+        // Assert - Should return stored environments
+        assert.deepStrictEqual(result, storedEnvs, 'Should return all stored UV environments');
     });
 
-    test('addUvEnvironment should add new environment to list', async () => {
+    test('should add new environment to tracking list', async () => {
+        // Mock - Existing environment list
         const existingEnvs = ['/path/to/env1'];
         const newEnvPath = '/path/to/env2';
         mockState.get.withArgs(UV_ENVS_KEY).resolves(existingEnvs);
 
+        // Run
         await addUvEnvironment(newEnvPath);
 
-        assert.ok(mockState.set.calledWith(UV_ENVS_KEY, ['/path/to/env1', '/path/to/env2']));
+        // Assert - Should store updated list with new environment
+        const expectedList = ['/path/to/env1', '/path/to/env2'];
+        assert.ok(mockState.set.calledWith(UV_ENVS_KEY, expectedList), 'Should add new environment to existing list');
     });
 
-    test('addUvEnvironment should not add duplicate environment', async () => {
+    test('should ignore duplicate environment additions', async () => {
+        // Mock - Environment already exists in list
         const existingEnvs = ['/path/to/env1', '/path/to/env2'];
         const duplicateEnvPath = '/path/to/env1';
         mockState.get.withArgs(UV_ENVS_KEY).resolves(existingEnvs);
 
+        // Run
         await addUvEnvironment(duplicateEnvPath);
 
-        assert.ok(mockState.set.notCalled);
+        // Assert - Should not modify state for duplicates
+        assert.ok(mockState.set.notCalled, 'Should not update storage when adding duplicate environment');
     });
 
-    test('removeUvEnvironment should remove environment from list', async () => {
+    test('should remove specified environment from tracking list', async () => {
+        // Mock - List with multiple environments
         const existingEnvs = ['/path/to/env1', '/path/to/env2'];
         const envToRemove = '/path/to/env1';
         mockState.get.withArgs(UV_ENVS_KEY).resolves(existingEnvs);
 
+        // Run
         await removeUvEnvironment(envToRemove);
 
-        assert.ok(mockState.set.calledWith(UV_ENVS_KEY, ['/path/to/env2']));
+        // Assert - Should store filtered list without removed environment
+        const expectedList = ['/path/to/env2'];
+        assert.ok(
+            mockState.set.calledWith(UV_ENVS_KEY, expectedList),
+            'Should remove specified environment from tracking list',
+        );
     });
 
-    test('clearUvEnvironments should set empty array', async () => {
+    test('should clear all tracked UV environments', async () => {
+        // Mock - (no setup needed for clear operation)
+
+        // Run
         await clearUvEnvironments();
 
-        assert.ok(mockState.set.calledWith(UV_ENVS_KEY, []));
+        // Assert - Should reset to empty list
+        assert.ok(mockState.set.calledWith(UV_ENVS_KEY, []), 'Should clear all UV environments from tracking');
     });
 
-    test('clearVenvCache should clear UV environments along with other caches', async () => {
+    test('should include UV environments when clearing venv cache', async () => {
+        // Mock - (no setup needed for clear operation)
+
+        // Run
         await clearVenvCache();
 
-        // Check that clear was called with the right keys including UV_ENVS_KEY
+        // Assert - Should clear UV environments as part of cache clearing
+        assert.ok(mockState.clear.called, 'Should call clear on persistent state');
         const clearArgs = mockState.clear.getCall(0).args[0];
-        assert.ok(clearArgs.includes(UV_ENVS_KEY));
+        assert.ok(
+            Array.isArray(clearArgs) && clearArgs.includes(UV_ENVS_KEY),
+            'Should include UV environments key in cache clearing',
+        );
     });
 });