packer/rpc: use public MockCommunicator, tests pass

packer/communicator_mock.go

 package packer
 
 import (
+	"bytes"
 	"io"
+	"sync"
 )
 
 // MockCommunicator is a valid Communicator implementation that can be
 // used for tests.
 type MockCommunicator struct {
-	Stderr io.Reader
-	Stdout io.Reader
+	StartCalled     bool
+	StartCmd        *RemoteCmd
+	StartStderr     string
+	StartStdout     string
+	StartStdin      string
+	StartExitStatus int
+
+	UploadCalled bool
+	UploadPath   string
+	UploadData   string
+
+	DownloadCalled bool
+	DownloadPath   string
+	DownloadData   string
 }
 
 func (c *MockCommunicator) Start(rc *RemoteCmd) error {
+	c.StartCalled = true
+	c.StartCmd = rc
+
 	go func() {
-		rc.Lock()
-		defer rc.Unlock()
+		var wg sync.WaitGroup
+		if rc.Stdout != nil && c.StartStdout != "" {
+			wg.Add(1)
+			go func() {
+				rc.Stdout.Write([]byte(c.StartStdout))
+				wg.Done()
+			}()
+		}
 
-		if rc.Stdout != nil && c.Stdout != nil {
-			io.Copy(rc.Stdout, c.Stdout)
+		if rc.Stderr != nil && c.StartStderr != "" {
+			wg.Add(1)
+			go func() {
+				rc.Stderr.Write([]byte(c.StartStderr))
+				wg.Done()
+			}()
 		}
 
-		if rc.Stderr != nil && c.Stderr != nil {
-			io.Copy(rc.Stderr, c.Stderr)
+		if rc.Stdin != nil {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				var data bytes.Buffer
+				io.Copy(&data, rc.Stdin)
+				c.StartStdin = data.String()
+			}()
 		}
+
+		wg.Wait()
+		rc.SetExited(c.StartExitStatus)
 	}()
 
 	return nil
 }
 
-func (c *MockCommunicator) Upload(string, io.Reader) error {
+func (c *MockCommunicator) Upload(path string, r io.Reader) error {
+	c.UploadCalled = true
+	c.UploadPath = path
+
+	var data bytes.Buffer
+	if _, err := io.Copy(&data, r); err != nil {
+		panic(err)
+	}
+
+	c.UploadData = data.String()
+
 	return nil
 }
 
@@ -36,6 +82,10 @@ func (c *MockCommunicator) UploadDir(string, string, []string) error {
 	return nil
 }
 
-func (c *MockCommunicator) Download(string, io.Writer) error {
+func (c *MockCommunicator) Download(path string, w io.Writer) error {
+	c.DownloadCalled = true
+	c.DownloadPath = path
+	w.Write([]byte(c.DownloadData))
+
 	return nil
 }

packer/communicator_test.go

@@ -11,14 +11,10 @@ func TestRemoteCmd_StartWithUi(t *testing.T) {
 	data := "hello\nworld\nthere"
 
 	originalOutput := new(bytes.Buffer)
-	rcOutput := new(bytes.Buffer)
 	uiOutput := new(bytes.Buffer)
-	rcOutput.WriteString(data)
-
-	testComm := &MockCommunicator{
-		Stdout: rcOutput,
-	}
 
+	testComm := new(MockCommunicator)
+	testComm.StartStdout = data
 	testUi := &BasicUi{
 		Reader: new(bytes.Buffer),
 		Writer: uiOutput,
@@ -29,22 +25,20 @@ func TestRemoteCmd_StartWithUi(t *testing.T) {
 		Stdout:  originalOutput,
 	}
 
-	go func() {
-		time.Sleep(100 * time.Millisecond)
-		rc.SetExited(0)
-	}()
-
 	err := rc.StartWithUi(testComm, testUi)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
 
-	if uiOutput.String() != strings.TrimSpace(data)+"\n" {
+	rc.Wait()
+
+	expected := strings.TrimSpace(data)
+	if uiOutput.String() != expected+"\n" {
 		t.Fatalf("bad output: '%s'", uiOutput.String())
 	}
 
-	if originalOutput.String() != data {
-		t.Fatalf("original is bad: '%s'", originalOutput.String())
+	if originalOutput.String() != expected {
+		t.Fatalf("bad: %#v", originalOutput.String())
 	}
 }
 

packer/rpc/communicator.go

@@ -123,6 +123,10 @@ func (c *communicator) Upload(path string, r io.Reader) (err error) {
 	return
 }
 
+func (c *communicator) UploadDir(dst string, src string, exclude []string) error {
+	return nil
+}
+
 func (c *communicator) Download(path string, w io.Writer) (err error) {
 	// We need to create a server that can proxy that data downloaded
 	// into the writer because we can't gob encode a writer directly.

packer/rpc/communicator_test.go

@@ -2,52 +2,15 @@ package rpc
 
 import (
 	"bufio"
-	"cgl.tideland.biz/asserts"
 	"github.com/mitchellh/packer/packer"
 	"io"
 	"net/rpc"
 	"testing"
-	"time"
 )
 
-type testCommunicator struct {
-	startCalled bool
-	startCmd    *packer.RemoteCmd
-
-	uploadCalled bool
-	uploadPath   string
-	uploadData   string
-
-	downloadCalled bool
-	downloadPath   string
-}
-
-func (t *testCommunicator) Start(cmd *packer.RemoteCmd) error {
-	t.startCalled = true
-	t.startCmd = cmd
-	return nil
-}
-
-func (t *testCommunicator) Upload(path string, reader io.Reader) (err error) {
-	t.uploadCalled = true
-	t.uploadPath = path
-	t.uploadData, err = bufio.NewReader(reader).ReadString('\n')
-	return
-}
-
-func (t *testCommunicator) Download(path string, writer io.Writer) error {
-	t.downloadCalled = true
-	t.downloadPath = path
-	writer.Write([]byte("download\n"))
-
-	return nil
-}
-
 func TestCommunicatorRPC(t *testing.T) {
-	assert := asserts.NewTestingAsserts(t, true)
-
 	// Create the interface to test
-	c := new(testCommunicator)
+	c := new(packer.MockCommunicator)
 
 	// Start the server
 	server := rpc.NewServer()
@@ -56,7 +19,9 @@ func TestCommunicatorRPC(t *testing.T) {
 
 	// Create the client over RPC and run some methods to verify it works
 	client, err := rpc.Dial("tcp", address)
-	assert.Nil(err, "should be able to connect")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
 	remote := Communicator(client)
 
 	// The remote command we'll use
@@ -70,56 +35,74 @@ func TestCommunicatorRPC(t *testing.T) {
 	cmd.Stdout = stdout_w
 	cmd.Stderr = stderr_w
 
+	// Send some data on stdout and stderr from the mock
+	c.StartStdout = "outfoo\n"
+	c.StartStderr = "errfoo\n"
+	c.StartExitStatus = 42
+
 	// Test Start
 	err = remote.Start(&cmd)
-	assert.Nil(err, "should not have an error")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
 
 	// Test that we can read from stdout
-	c.startCmd.Stdout.Write([]byte("outfoo\n"))
 	bufOut := bufio.NewReader(stdout_r)
 	data, err := bufOut.ReadString('\n')
-	assert.Nil(err, "should have no problem reading stdout")
-	assert.Equal(data, "outfoo\n", "should be correct stdout")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if data != "outfoo\n" {
+		t.Fatalf("bad data: %s", data)
+	}
 
 	// Test that we can read from stderr
-	c.startCmd.Stderr.Write([]byte("errfoo\n"))
 	bufErr := bufio.NewReader(stderr_r)
 	data, err = bufErr.ReadString('\n')
-	assert.Nil(err, "should have no problem reading stderr")
-	assert.Equal(data, "errfoo\n", "should be correct stderr")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if data != "errfoo\n" {
+		t.Fatalf("bad data: %s", data)
+	}
 
 	// Test that we can write to stdin
-	stdin_w.Write([]byte("infoo\n"))
-	bufIn := bufio.NewReader(c.startCmd.Stdin)
-	data, err = bufIn.ReadString('\n')
-	assert.Nil(err, "should have no problem reading stdin")
-	assert.Equal(data, "infoo\n", "should be correct stdin")
+	stdin_w.Write([]byte("info\n"))
+	stdin_w.Close()
+	cmd.Wait()
+	if c.StartStdin != "info\n" {
+		t.Fatalf("bad data: %s", data)
+	}
 
 	// Test that we can get the exit status properly
-	c.startCmd.SetExited(42)
-
-	for i := 0; i < 5; i++ {
-		cmd.Lock()
-		exited := cmd.Exited
-		cmd.Unlock()
-		if exited {
-			assert.Equal(cmd.ExitStatus, 42, "should have proper exit status")
-			break
-		}
-
-		time.Sleep(50 * time.Millisecond)
+	if cmd.ExitStatus != 42 {
+		t.Fatalf("bad exit: %d", cmd.ExitStatus)
 	}
 
-	assert.True(cmd.Exited, "should have exited")
-
 	// Test that we can upload things
 	uploadR, uploadW := io.Pipe()
-	go uploadW.Write([]byte("uploadfoo\n"))
+	go func() {
+		defer uploadW.Close()
+		uploadW.Write([]byte("uploadfoo\n"))
+	}()
 	err = remote.Upload("foo", uploadR)
-	assert.Nil(err, "should not error")
-	assert.True(c.uploadCalled, "should be called")
-	assert.Equal(c.uploadPath, "foo", "should be correct path")
-	assert.Equal(c.uploadData, "uploadfoo\n", "should have the proper data")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if !c.UploadCalled {
+		t.Fatal("should have uploaded")
+	}
+
+	if c.UploadPath != "foo" {
+		t.Fatalf("path: %s", c.UploadPath)
+	}
+
+	if c.UploadData != "uploadfoo\n" {
+		t.Fatalf("bad: %s", c.UploadData)
+	}
 
 	// Test that we can download things
 	downloadR, downloadW := io.Pipe()
@@ -133,21 +116,34 @@ func TestCommunicatorRPC(t *testing.T) {
 		downloadDone <- true
 	}()
 
+	c.DownloadData = "download\n"
 	err = remote.Download("bar", downloadW)
-	assert.Nil(err, "should not error")
-	assert.True(c.downloadCalled, "should have called download")
-	assert.Equal(c.downloadPath, "bar", "should have correct download path")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if !c.DownloadCalled {
+		t.Fatal("download should be called")
+	}
+
+	if c.DownloadPath != "bar" {
+		t.Fatalf("bad: %s", c.DownloadPath)
+	}
 
 	<-downloadDone
-	assert.Nil(downloadErr, "should not error reading download data")
-	assert.Equal(downloadData, "download\n", "should have the proper data")
+	if downloadErr != nil {
+		t.Fatalf("err: %s", downloadErr)
+	}
+
+	if downloadData != "download\n" {
+		t.Fatalf("bad: %s", downloadData)
+	}
 }
 
 func TestCommunicator_ImplementsCommunicator(t *testing.T) {
-	assert := asserts.NewTestingAsserts(t, true)
-
-	var r packer.Communicator
-	c := Communicator(nil)
-
-	assert.Implementor(c, &r, "should be a Communicator")
+	var raw interface{}
+	raw = Communicator(nil)
+	if _, ok := raw.(packer.Communicator); !ok {
+		t.Fatal("should be a Communicator")
+	}
 }

packer/rpc/provisioner_test.go

@@ -52,7 +52,7 @@ func TestProvisionerRPC(t *testing.T) {
 
 	// Test Provision
 	ui := &testUi{}
-	comm := &testCommunicator{}
+	comm := new(packer.MockCommunicator)
 	pClient.Provision(ui, comm)
 	assert.True(p.provCalled, "provision should be called")