Adds test for api attach via websocket

Signed-off-by: Andrew C. Bodine <acbodine@us.ibm.com>

integration-cli/docker_api_attach_test.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"bytes"
+	"net"
+	"os/exec"
+	"testing"
+
+	"code.google.com/p/go.net/websocket"
+)
+
+func TestGetContainersAttachWebsocket(t *testing.T) {
+	runCmd := exec.Command(dockerBinary, "run", "-dit", "busybox", "cat")
+	out, _, err := runCommandWithOutput(runCmd)
+	if err != nil {
+		t.Fatalf(out, err)
+	}
+	defer deleteAllContainers()
+
+	rwc, err := net.Dial("unix", "/var/run/docker.sock")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	cleanedContainerID := stripTrailingCharacters(out)
+	config, err := websocket.NewConfig(
+		"/containers/"+cleanedContainerID+"/attach/ws?stream=1&stdin=1&stdout=1&stderr=1",
+		"http://localhost",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ws, err := websocket.NewClient(config, rwc)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer ws.Close()
+
+	expected := []byte("hello")
+	actual := make([]byte, len(expected))
+	outChan := make(chan string)
+	go func() {
+		if _, err := ws.Read(actual); err != nil {
+			t.Fatal(err)
+		}
+		outChan <- "done"
+	}()
+
+	inChan := make(chan string)
+	go func() {
+		if _, err := ws.Write(expected); err != nil {
+			t.Fatal(err)
+		}
+		inChan <- "done"
+	}()
+
+	<-inChan
+	<-outChan
+
+	if !bytes.Equal(expected, actual) {
+		t.Fatal("Expected output on websocket to match input")
+	}
+
+	logDone("container attach websocket - can echo input via cat")
+}