Merge pull request #12939 from draghuram/history_test

Adding test for "GET /images/(name)/history" API.

integration-cli/docker_api_images_test.go

@@ -125,3 +125,25 @@ func (s *DockerSuite) TestApiImagesDelete(c *check.C) {
 	c.Assert(status, check.Equals, http.StatusOK)
 	c.Assert(err, check.IsNil)
 }
+
+func (s *DockerSuite) TestApiImagesHistory(c *check.C) {
+	testRequires(c, Network)
+	name := "test-api-images-history"
+	out, err := buildImage(name, "FROM hello-world\nENV FOO bar", false)
+	c.Assert(err, check.IsNil)
+
+	defer deleteImages(name)
+	id := strings.TrimSpace(out)
+
+	status, body, err := sockRequest("GET", "/images/"+id+"/history", nil)
+	c.Assert(err, check.IsNil)
+	c.Assert(status, check.Equals, http.StatusOK)
+
+	var historydata []types.ImageHistory
+	if err = json.Unmarshal(body, &historydata); err != nil {
+		c.Fatalf("Error on unmarshal: %s", err)
+	}
+
+	c.Assert(len(historydata), check.Not(check.Equals), 0)
+	c.Assert(historydata[0].Tags[0], check.Equals, "test-api-images-history:latest")
+}