The article discusses how to test a function that calls a dependency in other goroutines, which can make the test inconsistent. To solve this problem, the author suggests using Go’s sync.WaitGroup and GoMock’s .Do method. The article provides sample code for testing a service using these methods.

This article explains how to use GoMock, a mocking framework for the Go programming language, to mock external dependencies in order to facilitate unit testing. The article provides step-by-step instructions for generating a mock instance of an interface using GoMock, as well as an example test function that uses the mock to test the behavior of a service layer.