Added mockConvertQuery

mockConvertQuery.go

+package aql
+
+import "errors"
+
+// A MockService implements the query convert usecase interface (mock)
+type MockService struct {
+	throwError bool
+}
+
+// NewMockService creates a new query convert service (mock)
+func NewMockService() *MockService {
+	return &MockService{
+		throwError: false,
+	}
+}
+
+// ConvertQuery returns a hard coded string message (mock)
+func (s *MockService) ConvertQuery(jsonMsg *[]byte) (*string, *string, error) {
+	mockQuery := "Query converted"
+	mockDatabaseName := "test-database"
+
+	if !s.throwError {
+		return &mockQuery, &mockDatabaseName, nil
+	}
+	return nil, &mockDatabaseName, errors.New("Failed to convert query")
+}
+
+// ToggleError decides whether the convert function throws an error
+func (s *MockService) ToggleError() {
+	s.throwError = !s.throwError
+}