Use a fake datadir manager in etcd tests

pkg/framework/test/etcd.go

@@ -16,10 +16,10 @@ type Etcd struct {
 	Path           string
 	EtcdURL        string
 	ProcessStarter simpleSessionStarter
+	DataDirManager dataDirManager
 	session        SimpleSession
 	stdOut         *gbytes.Buffer
 	stdErr         *gbytes.Buffer
-	dataDirManager dataDirManager
 }
 
 type dataDirManager interface {
@@ -27,6 +27,8 @@ type dataDirManager interface {
 	Destroy() error
 }
 
+//go:generate counterfeiter . dataDirManager
+
 // SimpleSession describes a CLI session. You can get output, and you can kill it. It is implemented by *gexec.Session.
 type SimpleSession interface {
 	Buffer() *gbytes.Buffer
@@ -49,6 +51,7 @@ func NewEtcd(pathToEtcd string, etcdURL string) *Etcd {
 		Path:           pathToEtcd,
 		EtcdURL:        etcdURL,
 		ProcessStarter: starter,
+		DataDirManager: NewTempDirManager(),
 	}
 
 	return etcd
@@ -56,11 +59,10 @@ func NewEtcd(pathToEtcd string, etcdURL string) *Etcd {
 
 // Start starts the etcd, waits for it to come up, and returns an error, if occoured.
 func (e *Etcd) Start() error {
-	e.dataDirManager = NewTempDirManager()
 	e.stdOut = gbytes.NewBuffer()
 	e.stdErr = gbytes.NewBuffer()
 
-	dataDir, err := e.dataDirManager.Create()
+	dataDir, err := e.DataDirManager.Create()
 	if err != nil {
 		return err
 	}
@@ -97,7 +99,7 @@ func (e *Etcd) Stop() {
 	if e.session != nil {
 		e.session.Terminate()
 		e.session.Wait(20 * time.Second)
-		err := e.dataDirManager.Destroy()
+		err := e.DataDirManager.Destroy()
 		gomega.Expect(err).NotTo(gomega.HaveOccurred())
 	}
 }

pkg/framework/test/etcd_test.go

@@ -17,15 +17,19 @@ import (
 
 var _ = Describe("Etcd", func() {
 	var (
-		fakeSession *testfakes.FakeSimpleSession
-		etcd        *Etcd
+		fakeSession        *testfakes.FakeSimpleSession
+		fakeDataDirManager *testfakes.FakeDataDirManager
+		etcd               *Etcd
 	)
 
 	BeforeEach(func() {
 		fakeSession = &testfakes.FakeSimpleSession{}
+		fakeDataDirManager = &testfakes.FakeDataDirManager{}
+
 		etcd = &Etcd{
-			Path:    "",
-			EtcdURL: "our etcd url",
+			Path:           "",
+			EtcdURL:        "our etcd url",
+			DataDirManager: fakeDataDirManager,
 		}
 	})
 
@@ -51,6 +55,7 @@ var _ = Describe("Etcd", func() {
 			Expect(fakeSession.ExitCodeCallCount()).To(Equal(0))
 			Expect(etcd).NotTo(gexec.Exit())
 			Expect(fakeSession.ExitCodeCallCount()).To(Equal(1))
+			Expect(fakeDataDirManager.CreateCallCount()).To(Equal(1))
 
 			By("Stopping the Etcd Server")
 			etcd.Stop()
@@ -58,11 +63,28 @@ var _ = Describe("Etcd", func() {
 			Expect(fakeSession.TerminateCallCount()).To(Equal(1))
 			Expect(fakeSession.WaitCallCount()).To(Equal(1))
 			Expect(fakeSession.ExitCodeCallCount()).To(Equal(2))
+			Expect(fakeDataDirManager.DestroyCallCount()).To(Equal(1))
+		})
+	})
+
+	Context("when the data directory cannot be created", func() {
+		It("propagates the error, and does not start the process", func() {
+			fakeDataDirManager.CreateReturnsOnCall(0, "", fmt.Errorf("Error on directory creation."))
+
+			processStarterCounter := 0
+			etcd.ProcessStarter = func(Command *exec.Cmd, out, err io.Writer) (SimpleSession, error) {
+				processStarterCounter += 1
+				return fakeSession, nil
+			}
+
+			err := etcd.Start()
+			Expect(err).To(MatchError(ContainSubstring("Error on directory creation.")))
+			Expect(processStarterCounter).To(Equal(0))
 		})
 	})
 
 	Context("when  the starter returns an error", func() {
-		It("passes the error to the caller", func() {
+		It("propagates the error", func() {
 			etcd.ProcessStarter = func(command *exec.Cmd, out, err io.Writer) (SimpleSession, error) {
 				return nil, fmt.Errorf("Some error in the starter.")
 			}

pkg/framework/test/testfakes/fake_data_dir_manager.go

@@ -0,0 +1,140 @@
+// Code generated by counterfeiter. DO NOT EDIT.
+package testfakes
+
+import (
+	"sync"
+)
+
+type FakeDataDirManager struct {
+	CreateStub        func() (string, error)
+	createMutex       sync.RWMutex
+	createArgsForCall []struct{}
+	createReturns     struct {
+		result1 string
+		result2 error
+	}
+	createReturnsOnCall map[int]struct {
+		result1 string
+		result2 error
+	}
+	DestroyStub        func() error
+	destroyMutex       sync.RWMutex
+	destroyArgsForCall []struct{}
+	destroyReturns     struct {
+		result1 error
+	}
+	destroyReturnsOnCall map[int]struct {
+		result1 error
+	}
+	invocations      map[string][][]interface{}
+	invocationsMutex sync.RWMutex
+}
+
+func (fake *FakeDataDirManager) Create() (string, error) {
+	fake.createMutex.Lock()
+	ret, specificReturn := fake.createReturnsOnCall[len(fake.createArgsForCall)]
+	fake.createArgsForCall = append(fake.createArgsForCall, struct{}{})
+	fake.recordInvocation("Create", []interface{}{})
+	fake.createMutex.Unlock()
+	if fake.CreateStub != nil {
+		return fake.CreateStub()
+	}
+	if specificReturn {
+		return ret.result1, ret.result2
+	}
+	return fake.createReturns.result1, fake.createReturns.result2
+}
+
+func (fake *FakeDataDirManager) CreateCallCount() int {
+	fake.createMutex.RLock()
+	defer fake.createMutex.RUnlock()
+	return len(fake.createArgsForCall)
+}
+
+func (fake *FakeDataDirManager) CreateReturns(result1 string, result2 error) {
+	fake.CreateStub = nil
+	fake.createReturns = struct {
+		result1 string
+		result2 error
+	}{result1, result2}
+}
+
+func (fake *FakeDataDirManager) CreateReturnsOnCall(i int, result1 string, result2 error) {
+	fake.CreateStub = nil
+	if fake.createReturnsOnCall == nil {
+		fake.createReturnsOnCall = make(map[int]struct {
+			result1 string
+			result2 error
+		})
+	}
+	fake.createReturnsOnCall[i] = struct {
+		result1 string
+		result2 error
+	}{result1, result2}
+}
+
+func (fake *FakeDataDirManager) Destroy() error {
+	fake.destroyMutex.Lock()
+	ret, specificReturn := fake.destroyReturnsOnCall[len(fake.destroyArgsForCall)]
+	fake.destroyArgsForCall = append(fake.destroyArgsForCall, struct{}{})
+	fake.recordInvocation("Destroy", []interface{}{})
+	fake.destroyMutex.Unlock()
+	if fake.DestroyStub != nil {
+		return fake.DestroyStub()
+	}
+	if specificReturn {
+		return ret.result1
+	}
+	return fake.destroyReturns.result1
+}
+
+func (fake *FakeDataDirManager) DestroyCallCount() int {
+	fake.destroyMutex.RLock()
+	defer fake.destroyMutex.RUnlock()
+	return len(fake.destroyArgsForCall)
+}
+
+func (fake *FakeDataDirManager) DestroyReturns(result1 error) {
+	fake.DestroyStub = nil
+	fake.destroyReturns = struct {
+		result1 error
+	}{result1}
+}
+
+func (fake *FakeDataDirManager) DestroyReturnsOnCall(i int, result1 error) {
+	fake.DestroyStub = nil
+	if fake.destroyReturnsOnCall == nil {
+		fake.destroyReturnsOnCall = make(map[int]struct {
+			result1 error
+		})
+	}
+	fake.destroyReturnsOnCall[i] = struct {
+		result1 error
+	}{result1}
+}
+
+func (fake *FakeDataDirManager) Invocations() map[string][][]interface{} {
+	fake.invocationsMutex.RLock()
+	defer fake.invocationsMutex.RUnlock()
+	fake.createMutex.RLock()
+	defer fake.createMutex.RUnlock()
+	fake.destroyMutex.RLock()
+	defer fake.destroyMutex.RUnlock()
+	copiedInvocations := map[string][][]interface{}{}
+	for key, value := range fake.invocations {
+		copiedInvocations[key] = value
+	}
+	return copiedInvocations
+}
+
+func (fake *FakeDataDirManager) recordInvocation(key string, args []interface{}) {
+	fake.invocationsMutex.Lock()
+	defer fake.invocationsMutex.Unlock()
+	if fake.invocations == nil {
+		fake.invocations = map[string][][]interface{}{}
+	}
+	if fake.invocations[key] == nil {
+		fake.invocations[key] = [][]interface{}{}
+	}
+	fake.invocations[key] = append(fake.invocations[key], args)
+}