Application developers may want to test their code with simulated responses, including errors, from an object of type InstancesClient. To do so, construct an object of type InstancesClient with an instance of this class. Then use the Google Test framework functions to program the behavior of this mock.
See Also
This example for how to test your application with GoogleTest. While the example showcases types from the BigQuery library, the underlying principles apply for any pair of *Client and *Connection.
Functions
virtual options()
This function is implemented using gMock's MOCK_METHOD().
Consult the gMock documentation to use this mock in your tests.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[[["\u003cp\u003eThis webpage details the \u003ccode\u003eMockInstancesConnection\u003c/code\u003e class, which is designed for testing applications with simulated responses and errors from an \u003ccode\u003eInstancesClient\u003c/code\u003e object.\u003c/p\u003e\n"],["\u003cp\u003eThe content provides a list of available versions, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMockInstancesConnection\u003c/code\u003e class uses GoogleTest and gMock frameworks to program the behavior of mock objects within tests, allowing developers to simulate function calls and responses.\u003c/p\u003e\n"],["\u003cp\u003eThe class defines virtual functions like \u003ccode\u003eoptions()\u003c/code\u003e, \u003ccode\u003eListInstances()\u003c/code\u003e, \u003ccode\u003eGetInstance()\u003c/code\u003e, \u003ccode\u003eDeleteInstance()\u003c/code\u003e, and \u003ccode\u003eDebugInstance()\u003c/code\u003e, all of which are implemented using gMock's \u003ccode\u003eMOCK_METHOD()\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eAn example is provided to guide developers on how to apply the same testing principles to other \u003ccode\u003e*Client\u003c/code\u003e and \u003ccode\u003e*Connection\u003c/code\u003e pairs, even though it specifically references types from the BigQuery library.\u003c/p\u003e\n"]]],[],null,["# Class MockInstancesConnection (2.30.0)\n\nVersion 2.30.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/appengine/latest/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.41.0](/cpp/docs/reference/appengine/2.41.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.40.0](/cpp/docs/reference/appengine/2.40.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.39.0](/cpp/docs/reference/appengine/2.39.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.38.0](/cpp/docs/reference/appengine/2.38.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.37.0](/cpp/docs/reference/appengine/2.37.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.36.0](/cpp/docs/reference/appengine/2.36.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.35.0](/cpp/docs/reference/appengine/2.35.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.34.0](/cpp/docs/reference/appengine/2.34.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.33.0](/cpp/docs/reference/appengine/2.33.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.32.0](/cpp/docs/reference/appengine/2.32.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.31.0](/cpp/docs/reference/appengine/2.31.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.30.0](/cpp/docs/reference/appengine/2.30.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.29.0](/cpp/docs/reference/appengine/2.29.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.28.0](/cpp/docs/reference/appengine/2.28.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.27.0](/cpp/docs/reference/appengine/2.27.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.26.0](/cpp/docs/reference/appengine/2.26.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.25.1](/cpp/docs/reference/appengine/2.25.1/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.24.0](/cpp/docs/reference/appengine/2.24.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.23.0](/cpp/docs/reference/appengine/2.23.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.22.1](/cpp/docs/reference/appengine/2.22.1/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.21.0](/cpp/docs/reference/appengine/2.21.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.20.0](/cpp/docs/reference/appengine/2.20.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.19.0](/cpp/docs/reference/appengine/2.19.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.18.0](/cpp/docs/reference/appengine/2.18.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.17.0](/cpp/docs/reference/appengine/2.17.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.16.0](/cpp/docs/reference/appengine/2.16.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.15.1](/cpp/docs/reference/appengine/2.15.1/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.14.0](/cpp/docs/reference/appengine/2.14.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.13.0](/cpp/docs/reference/appengine/2.13.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.12.0](/cpp/docs/reference/appengine/2.12.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection)\n- [2.11.0](/cpp/docs/reference/appengine/2.11.0/classgoogle_1_1cloud_1_1appengine__v1__mocks_1_1MockInstancesConnection) \nA class to mock `InstancesConnection`. \nApplication developers may want to test their code with simulated responses, including errors, from an object of type `InstancesClient`. To do so, construct an object of type `InstancesClient` with an instance of this class. Then use the Google Test framework functions to program the behavior of this mock.\n\n###### See Also\n\n[This example](https://cloud.google.com/cpp/docs/reference/bigquery/2.30.0/bigquery-read-mock) for how to test your application with GoogleTest. While the example showcases types from the BigQuery library, the underlying principles apply for any pair of `*Client` and `*Connection`.\n\nFunctions\n---------\n\n### virtual options()\n\nThis function is implemented using [gMock](https://google.github.io/googletest)'s `MOCK_METHOD()`.\nConsult the gMock documentation to use this mock in your tests.\n\n### virtual ListInstances(google::appengine::v1::ListInstancesRequest)\n\nThis function is implemented using [gMock](https://google.github.io/googletest)'s `MOCK_METHOD()`.\nConsult the gMock documentation to use this mock in your tests.\n\n### virtual GetInstance(google::appengine::v1::GetInstanceRequest const \\&)\n\nThis function is implemented using [gMock](https://google.github.io/googletest)'s `MOCK_METHOD()`.\nConsult the gMock documentation to use this mock in your tests.\n\n### virtual DeleteInstance(google::longrunning::Operation const \\&)\n\nThis function is implemented using [gMock](https://google.github.io/googletest)'s `MOCK_METHOD()`.\nConsult the gMock documentation to use this mock in your tests.\n\n### virtual DebugInstance(google::longrunning::Operation const \\&)\n\nThis function is implemented using [gMock](https://google.github.io/googletest)'s `MOCK_METHOD()`.\nConsult the gMock documentation to use this mock in your tests."]]
