Function TestUseHostOverrideEmpty

cli/command/context/use_test.go:117–154

An empty DOCKER_HOST used to break the 'context use' flow. So we have a test with fewer fakes that tests this flow holistically. https://github.com/docker/cli/issues/3667

(t *testing.T)

// So we have a test with fewer fakes that tests this flow holistically.
// https://github.com/docker/cli/issues/3667
func TestUseHostOverrideEmpty(t *testing.T) {
	t.Setenv("DOCKER_HOST", "")

	configDir := t.TempDir()
	config.SetDir(configDir)

	socketPath := "unix://" + filepath.Join(configDir, "docker.sock")

	var out *bytes.Buffer
	var cli *command.DockerCli

	loadCli := func() {
		out = bytes.NewBuffer(nil)

		var err error
		cli, err = command.NewDockerCli(command.WithCombinedStreams(out))
		assert.NilError(t, err)
		assert.NilError(t, cli.Initialize(flags.NewClientOptions()))
	}
	loadCli()
	err := runCreate(cli, "test", createOptions{
		endpoint: map[string]string{"host": socketPath},
	})
	assert.NilError(t, err)

	err = newUseCommand(cli).RunE(nil, []string{"test"})
	assert.NilError(t, err)
	assert.Assert(t, !is.Contains(out.String(), "Warning")().Success())
	assert.Assert(t, is.Contains(out.String(), `Current context is now "test"`))

	loadCli()
	err = newShowCommand(cli).RunE(nil, nil)
	assert.NilError(t, err)
	assert.Assert(t, is.Contains(out.String(), "test"))

	apiclient := cli.Client()
	assert.Equal(t, apiclient.DaemonHost(), socketPath)
}