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GoMock is a mocking framework for the Go programming language. It integrates well with Go's built-in testing package, but can be used in other contexts too.

Installation

Once you have installed Go, run these commands to install the gomock package and the mockgen tool:

go install code.google.com/p/gomock/gomock
go install code.google.com/p/gomock/mockgen

Documentation

After installing, you can use go doc to get documentation:

go doc code.google.com/p/gomock/gomock

Alternatively, there is an online reference for the package hosted on GoPkgDoc here.

Running mockgen

The mockgen command is used to generate source code for a mock class given a Go source file containing interfaces to be mocked. It supports the following flags:

  • -source: The file containing interfaces to be mocked. You must supply this flag.

  • -destination: A file to which to write the resulting source code. If you don't set this, the code is printed to standard output.

  • -package: The package to use for the resulting mock class source code. If you don't set this, the package name is mock_ concatenated with the package of the input file.

  • -imports: A list of explicit imports that should be used in the resulting source code, specified as a comma-separated list of elements of the form foo=bar/baz, where bar/baz is the package being imported and foo is the identifier to use for the package in the generated source code.

  • -aux_files: A list of additional files that should be consulted to resolve e.g. embedded interfaces defined in a different file. This is specified as a comma-separated list of elements of the form foo=bar/baz.go, where bar/baz.go is the source file and foo is the package name of that file used by the -source file.

For an example of the use of mockgen, see the sample/ directory. In simple cases, you will need only the -source flag.

TODO: Brief overview of how to create mock objects and set up expectations, and an example.

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