added tests

sqlmock_go18_test.go

@@ -654,17 +654,28 @@ func Test_sqlmock_Exec(t *testing.T) {
 		t.Errorf("an error '%s' was not expected when opening a stub database connection", err)
 	}
 	defer db.Close()
-	query := "SELECT name, email FROM users WHERE name = ?"
+
+	mock.ExpectBegin()
+	_, err = mock.(*sqlmock).Exec("", []driver.Value{})
+	if err == nil {
+		t.Errorf("error expected")
+		return
+	}
 
 	expected := NewResult(1, 1)
 	mock.ExpectExec("SELECT (.+) FROM users WHERE (.+)").
 		WillReturnResult(expected).
 		WithArgs("test")
 
+	matchErr := errors.New("matcher sqlmock.failArgument could not match 0 argument driver.NamedValue - {Name: Ordinal:1 Value:{}}")
 	mock.ExpectExec("SELECT (.+) FROM animals WHERE (.+)").
-		WillReturnError(errors.New("matcher %T could not match %d argument %T - %+v")).
+		WillReturnError(matchErr).
 		WithArgs(failArgument{})
 
+	mock.ExpectExec("").WithArgs(failArgument{})
+
+	mock.(*sqlmock).expected = mock.(*sqlmock).expected[1:]
+	query := "SELECT name, email FROM users WHERE name = ?"
 	result, err := mock.(*sqlmock).Exec(query, []driver.Value{"test"})
 	if err != nil {
 		t.Error(err)
@@ -675,7 +686,14 @@ func Test_sqlmock_Exec(t *testing.T) {
 		return
 	}
 
-	_, err = mock.(*sqlmock).Exec(query, []driver.Value{failArgument{}})
+	failQuery := "SELECT name, sex FROM animals WHERE sex = ?"
+	_, err = mock.(*sqlmock).Exec(failQuery, []driver.Value{failArgument{}})
+	if err == nil {
+		t.Errorf("error expected")
+		return
+	}
+	mock.(*sqlmock).ordered = false
+	_, err = mock.(*sqlmock).Exec("", []driver.Value{failArgument{}})
 	if err == nil {
 		t.Errorf("error expected")
 		return
@@ -697,4 +715,9 @@ func Test_sqlmock_Query(t *testing.T) {
 		return
 	}
 	defer rows.Close()
+	_, err = mock.(*sqlmock).Query(query, []driver.Value{failArgument{}})
+	if err == nil {
+		t.Errorf("error expected")
+		return
+	}
 }