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Showing content from https://cloud.google.com/cpp/docs/reference/bigquery/2.11.0/bigquery-read-mock below:

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 document provides instructions on how to test Cloud BigQueryRead applications using the C++ client library, Google Test, and the Google Test Mocking Framework."],["The latest version available for the BigQueryRead API is `2.37.0-rc`, while the document examples utilize version `2.11.0` of the API."],["A key part of testing is demonstrated by creating a mock object for `BigQueryReadConnection`, which is then used to set expectations and verify results."],["The `CreateReadSession` method is mocked in the example, showing how to set up expectations and verify that the created session meets the defined requirements."],["The document provides a complete code listing showcasing the implementation of mocking `CreateReadSession` using the specified libraries."]]],[]]

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