Migrate TestGetEvents into a unit and a CLI test

Docker-DCO-1.1-Signed-off-by: Guilherme Salgado <gsalgado@gmail.com> (github: gsalgado)

integration-cli/docker_cli_events_test.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestCLIGetEvents(t *testing.T) {
+	out, _, _ := cmd(t, "images", "-q")
+	image := strings.Split(out, "\n")[0]
+	cmd(t, "tag", image, "utest:tag1")
+	cmd(t, "tag", image, "utest:tag2")
+	cmd(t, "rmi", "utest:tag1")
+	cmd(t, "rmi", "utest:tag2")
+	eventsCmd := exec.Command("timeout", "0.2", dockerBinary, "events", "--since=1")
+	out, _, _ = runCommandWithOutput(eventsCmd)
+	events := strings.Split(out, "\n")
+	n_events := len(events)
+	// The last element after the split above will be an empty string, so we
+	// get the two elements before the last, which are the untags we're
+	// looking for.
+	for _, v := range events[n_events-3 : n_events-1] {
+		if !strings.Contains(v, "untag") {
+			t.Fatalf("event should be untag, not %#v", v)
+		}
+	}
+	logDone("events - untags are logged")
+}