Other: Fix race conditions in integration tests

tests/ctx_test.go

@@ -67,10 +67,12 @@ type testCtx struct {
 	smtpClients map[string]*smtpClient
 
 	// calls holds calls made to the API during each step of the test.
-	calls [][]server.Call
+	calls     [][]server.Call
+	callsLock sync.RWMutex
 
 	// errors holds test-related errors encountered while running test steps.
-	errors [][]error
+	errors     [][]error
+	errorsLock sync.RWMutex
 }
 
 type imapClient struct {
@@ -86,7 +88,7 @@ type smtpClient struct {
 func newTestCtx(tb testing.TB) *testCtx {
 	dir := tb.TempDir()
 
-	ctx := &testCtx{
+	t := &testCtx{
 		dir:      dir,
 		api:      newFakeAPI(),
 		netCtl:   liteapi.NewNetCtl(),
@@ -105,14 +107,23 @@ func newTestCtx(tb testing.TB) *testCtx {
 		smtpClients: make(map[string]*smtpClient),
 	}
 
-	ctx.api.AddCallWatcher(func(call server.Call) {
-		ctx.calls[len(ctx.calls)-1] = append(ctx.calls[len(ctx.calls)-1], call)
+	t.api.AddCallWatcher(func(call server.Call) {
+		t.callsLock.Lock()
+		defer t.callsLock.Unlock()
+
+		t.calls[len(t.calls)-1] = append(t.calls[len(t.calls)-1], call)
 	})
 
-	return ctx
+	return t
 }
 
 func (t *testCtx) beforeStep() {
+	t.callsLock.Lock()
+	defer t.callsLock.Unlock()
+
+	t.errorsLock.Lock()
+	defer t.errorsLock.Unlock()
+
 	t.calls = append(t.calls, nil)
 	t.errors = append(t.errors, nil)
 }
@@ -205,38 +216,35 @@ func (t *testCtx) getMBoxID(userID string, name string) string {
 	return labelID
 }
 
-func (t *testCtx) getLastCall(method, path string) (server.Call, error) {
-	var allCalls []server.Call
+func (t *testCtx) getLastCall(method, pathExp string) (server.Call, error) {
+	t.callsLock.RLock()
+	defer t.callsLock.RUnlock()
 
-	for _, calls := range t.calls {
-		allCalls = append(allCalls, calls...)
+	if matches := xslices.Filter(xslices.Join(t.calls...), func(call server.Call) bool {
+		return call.Method == method && regexp.MustCompile("^"+pathExp+"$").MatchString(call.URL.Path)
+	}); len(matches) > 0 {
+		return matches[len(matches)-1], nil
 	}
 
-	if len(allCalls) == 0 {
-		return server.Call{}, fmt.Errorf("no calls made")
-	}
-
-	for idx := len(allCalls) - 1; idx >= 0; idx-- {
-		if call := allCalls[idx]; call.Method == method && regexp.MustCompile("^"+path+"$").MatchString(call.URL.Path) {
-			return call, nil
-		}
-	}
-
-	return server.Call{}, fmt.Errorf("no call with method %q and path %q was made", method, path)
+	return server.Call{}, fmt.Errorf("no call with method %q and path %q was made", method, pathExp)
 }
 
 func (t *testCtx) pushError(err error) {
+	t.errorsLock.Lock()
+	defer t.errorsLock.Unlock()
+
 	t.errors[len(t.errors)-1] = append(t.errors[len(t.errors)-1], err)
 }
 
 func (t *testCtx) getLastError() error {
-	errors := t.errors[len(t.errors)-2]
+	t.errorsLock.RLock()
+	defer t.errorsLock.RUnlock()
 
-	if len(errors) == 0 {
-		return nil
+	if lastStep := t.errors[len(t.errors)-2]; len(lastStep) > 0 {
+		return lastStep[len(lastStep)-1]
 	}
 
-	return errors[len(errors)-1]
+	return nil
 }
 
 func (t *testCtx) close(ctx context.Context) error {