adds missing lock around e.fulfilled() in ExpectationsWereMet()

sqlmock.go

@@ -166,7 +166,11 @@ func (c *sqlmock) Close() error {
 
 func (c *sqlmock) ExpectationsWereMet() error {
 	for _, e := range c.expected {
-		if !e.fulfilled() {
+		e.Lock()
+		fulfilled := e.fulfilled()
+		e.Unlock()
+
+		if !fulfilled {
 			return fmt.Errorf("there is a remaining expectation which was not matched: %s", e)
 		}
 

sqlmock_test.go

@@ -1167,3 +1167,53 @@ func TestNewRows(t *testing.T) {
 		t.Errorf("expecting to create a row with columns %v, actual colmns are %v", r.cols, columns)
 	}
 }
+
+// This is actually a test of ExpectationsWereMet. Without a lock around e.fulfilled() inside
+// ExpectationWereMet, the race detector complains if e.triggered is being read while it is also
+// being written by the query running in another goroutine.
+func TestQueryWithTimeout(t *testing.T) {
+	db, mock, err := New()
+	if err != nil {
+		t.Errorf("an error '%s' was not expected when opening a stub database connection", err)
+	}
+	defer db.Close()
+
+	rs := NewRows([]string{"id", "title"}).FromCSVString("5,hello world")
+
+	mock.ExpectQuery("SELECT (.+) FROM articles WHERE id = ?").
+		WillDelayFor(15 * time.Millisecond). // Query will take longer than timeout
+		WithArgs(5).
+		WillReturnRows(rs)
+
+	_, err = queryWithTimeout(10*time.Millisecond, db, "SELECT (.+) FROM articles WHERE id = ?", 5)
+	if err == nil {
+		t.Errorf("expecting query to time out")
+	}
+
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Errorf("there were unfulfilled expectations: %s", err)
+	}
+}
+
+func queryWithTimeout(t time.Duration, db *sql.DB, query string, args ...interface{}) (*sql.Rows, error) {
+	rowsChan := make(chan *sql.Rows, 1)
+	errChan := make(chan error, 1)
+
+	go func() {
+		rows, err := db.Query(query, args...)
+		if err != nil {
+			errChan <- err
+			return
+		}
+		rowsChan <- rows
+	}()
+
+	select {
+	case rows := <-rowsChan:
+		return rows, nil
+	case err := <-errChan:
+		return nil, err
+	case <-time.After(t):
+		return nil, fmt.Errorf("query timed out after %v", t)
+	}
+}