test: covers the themes list command

.gitignore

@@ -4,3 +4,4 @@ doc.html
 doc.md
 collection.json
 .cover
+*.coverprofile

commands/commands_suite_test.go

@@ -0,0 +1,13 @@
+package commands_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestCommands(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Commands Suite")
+}

commands/list_themes_test.go

@@ -0,0 +1,89 @@
+package commands_test
+
+import (
+	"bytes"
+	"errors"
+
+	. "github.com/aubm/postmanerator/commands"
+	"github.com/aubm/postmanerator/configuration"
+	. "github.com/aubm/postmanerator/themes/tests"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("ListThemes", func() {
+
+	var (
+		mockStdOut        *bytes.Buffer
+		mockThemesManager *MockThemesManager
+		listThemesCommand *ListThemes
+	)
+
+	BeforeEach(func() {
+		mockStdOut = new(bytes.Buffer)
+		mockThemesManager = &MockThemesManager{}
+		mockConfig := &configuration.Configuration{Out: mockStdOut}
+		listThemesCommand = &ListThemes{
+			Config: mockConfig,
+			Themes: mockThemesManager,
+		}
+	})
+
+	Describe("Is", func() {
+
+		It("should be OK", func() {
+			Expect(listThemesCommand.Is("cmd_themes_list")).To(BeTrue())
+		})
+
+		It("should be KO", func() {
+			Expect(listThemesCommand.Is("cmd_default")).To(BeFalse())
+		})
+
+	})
+
+	Describe("Do", func() {
+
+		var returnedError error
+
+		JustBeforeEach(func() {
+			returnedError = listThemesCommand.Do()
+		})
+
+		Context("when the manager responds with a list of themes", func() {
+
+			BeforeEach(func() {
+				mockThemesManager.On("List").Return([]string{"default", "markdown"}, nil)
+			})
+
+			It("should not return an error", func() {
+				Expect(returnedError).To(BeNil())
+			})
+
+			It("should print the themes in the output", func() {
+				Expect(mockStdOut.String()).To(Equal("default\nmarkdown\n"))
+			})
+
+		})
+
+		Context("when the manager responds with an error", func() {
+
+			var managerError = errors.New("something bad happened")
+
+			BeforeEach(func() {
+				mockThemesManager.On("List").Return([]string{}, managerError)
+			})
+
+			It("should return an error", func() {
+				Expect(returnedError).NotTo(BeNil())
+				Expect(returnedError).To(Equal(managerError))
+			})
+
+			It("should not write anything in the output", func() {
+				Expect(mockStdOut.String()).To(BeZero())
+			})
+
+		})
+
+	})
+
+})

themes/tests/manager.go

@@ -0,0 +1,12 @@
+package tests
+
+import "github.com/stretchr/testify/mock"
+
+type MockThemesManager struct {
+	mock.Mock
+}
+
+func (m *MockThemesManager) List() ([]string, error) {
+	args := m.Called()
+	return args.Get(0).([]string), args.Error(1)
+}