@@ -128,3 +128,39 @@ func (s *DockerSuite) TestAPIImagesSearchJSONContentType(c *check.C) {

 	c.Assert(res.StatusCode, checker.Equals, http.StatusOK)

 	c.Assert(res.Header.Get("Content-Type"), checker.Equals, "application/json")

 }

+

+// Test case for 30027: image size reported as -1 in v1.12 client against v1.13 daemon.

+// This test checks to make sure both v1.12 and v1.13 client against v1.13 daemon get correct `Size` after the fix.

+func (s *DockerSuite) TestAPIImagesSizeCompatibility(c *check.C) {

+	status, b, err := request.SockRequest("GET", "/images/json", nil, daemonHost())

+	c.Assert(err, checker.IsNil)

+	c.Assert(status, checker.Equals, http.StatusOK)

+	var images []types.ImageSummary

+	err = json.Unmarshal(b, &images)

+	c.Assert(err, checker.IsNil)

+	c.Assert(len(images), checker.Not(checker.Equals), 0)

+	for _, image := range images {

+		c.Assert(image.Size, checker.Not(checker.Equals), int64(-1))

+	}

+

+	type v124Image struct {

+		ID          string `json:"Id"`

+		ParentID    string `json:"ParentId"`

+		RepoTags    []string

+		RepoDigests []string

+		Created     int64

+		Size        int64

+		VirtualSize int64

+		Labels      map[string]string

+	}

+	status, b, err = request.SockRequest("GET", "/v1.24/images/json", nil, daemonHost())

+	c.Assert(err, checker.IsNil)

+	c.Assert(status, checker.Equals, http.StatusOK)

+	var v124Images []v124Image

+	err = json.Unmarshal(b, &v124Images)

+	c.Assert(err, checker.IsNil)

+	c.Assert(len(v124Images), checker.Not(checker.Equals), 0)

+	for _, image := range v124Images {

+		c.Assert(image.Size, checker.Not(checker.Equals), int64(-1))

+	}

+}