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C++ Client Libraries | Google Cloud

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Testing your Cloud BigQueryRead application with googlemock

This document describes how to test your own Cloud BigQueryRead application using the Cloud BigQueryRead C++ client library, Google Test and the Google Test Mocking Framework.

Mocking a Successful BigQueryReadClient::GetServiceAccount() call

First include the headers for the Cloud BigQueryRead Client, the mocking class, and the Google Mock framework:

#include "google/cloud/bigquery/storage/v1/bigquery_read_client.h"
#include "google/cloud/bigquery/storage/v1/mocks/mock_bigquery_read_connection.h"
#include <gmock/gmock.h>

The example uses a number of aliases to save typing and improve readability:

using ::google::cloud::bigquery_storage_v1_mocks::MockBigQueryReadConnection;
namespace bigquery = ::google::cloud::bigquery_storage_v1;

Create a mocking object for google::cloud::bigquery_storage_v1::BigQueryReadConnection:

  auto mock = std::make_shared<MockBigQueryReadConnection>();

It is customary to first setup the expectations for your mock, and then write the rest of the code:

  EXPECT_CALL(*mock, CreateReadSession)
      .WillOnce([&](google::cloud::bigquery::storage::v1::
                        CreateReadSessionRequest const& request) {
        EXPECT_EQ("test-project-name", request.parent());
        EXPECT_EQ("test-table-name", request.read_session().table());
        google::cloud::bigquery::storage::v1::ReadSession response;
        google::cloud::bigquery::storage::v1::ReadStream stream;
        stream.set_name("test-stream");
        *response.add_streams() = stream;
        return google::cloud::StatusOr<
            google::cloud::bigquery::storage::v1::ReadSession>(response);
      });

With the expectations in place, create a google::cloud::bigquery_storage_v1::BigQueryReadClient object:

  bigquery::BigQueryReadClient bigquery_client(mock);

And then make calls on the client as usual:

  google::cloud::bigquery::storage::v1::ReadSession read_session;
  read_session.set_table("test-table-name");
  int max_streams = 1;
  auto session = bigquery_client.CreateReadSession("test-project-name",
                                                   read_session, max_streams);

And then verify the results meet your expectations:

  EXPECT_TRUE(session.ok());
  EXPECT_EQ("test-stream", session->streams(0).name());

Full Listing

Finally we present the full code for this example:


#include "google/cloud/bigquery/storage/v1/bigquery_read_client.h"
#include "google/cloud/bigquery/storage/v1/mocks/mock_bigquery_read_connection.h"
#include <gmock/gmock.h>

namespace {

using ::google::cloud::bigquery_storage_v1_mocks::MockBigQueryReadConnection;
namespace bigquery = ::google::cloud::bigquery_storage_v1;

TEST(MockCreateReadSessionExample, CreateReadSession) {
  auto mock = std::make_shared<MockBigQueryReadConnection>();

  EXPECT_CALL(*mock, CreateReadSession)
      .WillOnce([&](google::cloud::bigquery::storage::v1::
                        CreateReadSessionRequest const& request) {
        EXPECT_EQ("test-project-name", request.parent());
        EXPECT_EQ("test-table-name", request.read_session().table());
        google::cloud::bigquery::storage::v1::ReadSession response;
        google::cloud::bigquery::storage::v1::ReadStream stream;
        stream.set_name("test-stream");
        *response.add_streams() = stream;
        return google::cloud::StatusOr<
            google::cloud::bigquery::storage::v1::ReadSession>(response);
      });

  bigquery::BigQueryReadClient bigquery_client(mock);

  google::cloud::bigquery::storage::v1::ReadSession read_session;
  read_session.set_table("test-table-name");
  int max_streams = 1;
  auto session = bigquery_client.CreateReadSession("test-project-name",
                                                   read_session, max_streams);

  EXPECT_TRUE(session.ok());
  EXPECT_EQ("test-stream", session->streams(0).name());
}

}  // namespace

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This page provides documentation for testing Cloud BigQueryRead applications using the C++ client library, Google Test, and the Google Test Mocking Framework."],["The latest version of the library is 2.37.0-rc, with a list of previous versions extending back to 2.11.0, and version 2.17.0 is referenced specifically within the content."],["The documentation focuses on mocking a successful `BigQueryReadClient::GetServiceAccount()` call, using a `MockBigQueryReadConnection` object to define expected behaviors."],["The example demonstrates creating a mock object, setting up expectations for the `CreateReadSession` function, and verifying the results meet these defined expectations."],["The full code listing shows a complete example, including necessary headers, namespaces, and test functions, to illustrate how to implement and test using the mocking framework."]]],[]]

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