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import (
  "testing"
)

func TestGetDirPath(t *testing.T) {

  imageClient := &ImageClient{"test_image", "test_meta"}
  actual, dir, err := imageClient.GetDirPath("test")
  var expected = "/home/enyi/images/test_image/test"
  if actual != expected {
    t.Errorf("Path was incorrect, got: %s, want %s.", actual, expected)
  }
}

The TestGetDirPath (Test test functions begin with 'Test') function uses the testing package to print a message before failing. You can explore the testing package here https://golang.org/pkg/testing/.

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Next, we'll mock out the user package with Testify and rewrite our test.

If you're using go modules for dependency management, you don't have to install Testify. Otherwise, run:

go get https://github.com/stretchr/testify

To mock a third party application we use an interface. This allows us to create a method, GetUser, that uses the package that we'd like to mock.

So, ultimately, we'll have two definitions of our interface: actual definition and mock definition.

The interface:

type ImageManager interface {
	GetCurrentUser (*user.User)
}

References:

1. https://restfulapi.net/rest-architectural-constraints/

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