Add a binding test to check image tag and list commands.

Include testcase to validate tag api responses and check if
all the image instaces are shown list command.
Also, Update the binding process and the response

Signed-off-by: Sujil02 <sushah@redhat.com>

pkg/bindings/errors.go

@@ -3,7 +3,6 @@ package bindings
 import (
 	"encoding/json"
 	"io/ioutil"
-	"net/http"
 
 	"github.com/containers/libpod/pkg/api/handlers/utils"
 	"github.com/pkg/errors"
@@ -26,7 +25,7 @@ func (a APIResponse) Process(unmarshalInto interface{}) error {
 	if err != nil {
 		return errors.Wrap(err, "unable to process API response")
 	}
-	if a.Response.StatusCode == http.StatusOK {
+	if a.IsSuccess() {
 		if unmarshalInto != nil {
 			return json.Unmarshal(data, unmarshalInto)
 		}

pkg/bindings/test/images_test.go

@@ -89,4 +89,39 @@ var _ = Describe("Podman images", func() {
 
 	})
 
+	//Tests to validate the image tag command.
+	It("tag image", func() {
+		// Validates if invalid image name is given a bad response is encountered.
+		err = images.Tag(connText, "dummy", "demo", "alpine")
+		Expect(err).ToNot(BeNil())
+		code, _ := bindings.CheckResponseCode(err)
+		Expect(code).To(BeNumerically("==", 404))
+
+		// Validates if the image is tagged sucessfully.
+		err = images.Tag(connText, "alpine", "demo", "alpine")
+		Expect(err).To(BeNil())
+
+		//Validates if name updates when the image is retagged.
+		_, err := images.GetImage(connText, "alpine:demo", nil)
+		Expect(err).To(BeNil())
+
+	})
+
+	//Test to validate the List images command.
+	It("List image", func() {
+		//Array to hold the list of images returned
+		imageSummary, err := images.List(connText, nil, nil)
+		//There Should be no errors in the response.
+		Expect(err).To(BeNil())
+		//Since in the begin context only one image is created the list context should have only one image
+		Expect(len(imageSummary)).To(Equal(1))
+
+		//To be written create a new image and check list count again
+		//imageSummary, err = images.List(connText, nil, nil)
+
+		//Since in the begin context only one image adding one more image should
+		///Expect(len(imageSummary)).To(Equal(2)
+
+	})
+
 })