@@ -151,6 +151,26 @@ func TestInspectResponseEmptyContentType(t *testing.T) {

 	}

 }

+func TestUnknownContentLength(t *testing.T) {

+	content := []byte(dockerfileContents)

+	ct := "text/plain"

+	br := ioutil.NopCloser(bytes.NewReader(content))

+	contentType, bReader, err := inspectResponse(ct, br, -1)

+	if err != nil {

+		t.Fatal(err)

+	}

+	if contentType != "text/plain" {

+		t.Fatalf("Content type should be 'text/plain' but is %q", contentType)

+	}

+	body, err := ioutil.ReadAll(bReader)

+	if err != nil {

+		t.Fatal(err)

+	}

+	if string(body) != dockerfileContents {

+		t.Fatalf("Corrupted response body %s", body)

+	}

+}

+

 func TestMakeRemoteContext(t *testing.T) {

 	contextDir, cleanup := createTestTempDir(t, "", "builder-tarsum-test")

 	defer cleanup()