added test cases for delete label

Author: Shubh Bapna

extended/src/test/java/io/kubernetes/client/extended/kubectl/KubectlLabelTest.java

@@ -74,6 +74,43 @@ public void testKubectlLabelNamespacedResourceShouldWork() throws KubectlExcepti
     assertNotNull(labelledPod);
   }
 
+  @Test
+  public void testKubectlDeleteLabelNamespacedResourceShouldWork() throws KubectlException {
+    wireMockRule.stubFor(
+            get(urlPathEqualTo("/api/v1/namespaces/default/pods/foo"))
+                    .willReturn(
+                            aResponse()
+                                    .withStatus(200)
+                                    .withBody("{\"metadata\":{\"name\":\"foo\",\"namespace\":\"default\"}}")));
+    wireMockRule.stubFor(
+            put(urlPathEqualTo("/api/v1/namespaces/default/pods/foo"))
+                    .willReturn(
+                            aResponse()
+                                    .withStatus(200)
+                                    .withBody("{\"metadata\":{\"name\":\"foo\",\"namespace\":\"default\"}}")));
+
+    Kubectl.label(V1Pod.class)
+            .apiClient(apiClient)
+            .skipDiscovery()
+            .namespace("default")
+            .name("foo")
+            .addLabel("k1", "v1")
+            .execute();
+
+    V1Pod unlabelledPod =
+            Kubectl.label(V1Pod.class)
+                    .apiClient(apiClient)
+                    .skipDiscovery()
+                    .namespace("default")
+                    .name("foo")
+                    .deleteLabel("k1")
+                    .execute();
+
+    wireMockRule.verify(2, getRequestedFor(urlPathEqualTo("/api/v1/namespaces/default/pods/foo")));
+    wireMockRule.verify(2, putRequestedFor(urlPathEqualTo("/api/v1/namespaces/default/pods/foo")));
+    assertNotNull(unlabelledPod);
+  }
+
   @Test
   public void testKubectlLabelNamespacedResourceReceiveForbiddenShouldThrowException()
       throws KubectlException {
@@ -123,6 +160,35 @@ public void testKubectlLabelClusterResourceShouldWork() throws KubectlException
     assertNotNull(labelledNode);
   }
 
+  @Test
+  public void testKubectlDeleteLabelClusterResourceShouldWork() throws KubectlException {
+    wireMockRule.stubFor(
+            get(urlPathEqualTo("/api/v1/nodes/foo"))
+                    .willReturn(aResponse().withStatus(200).withBody("{\"metadata\":{\"name\":\"foo\"}}")));
+    wireMockRule.stubFor(
+            put(urlPathEqualTo("/api/v1/nodes/foo"))
+                    .willReturn(aResponse().withStatus(200).withBody("{\"metadata\":{\"name\":\"foo\"}}")));
+
+    Kubectl.label(V1Node.class)
+            .apiClient(apiClient)
+            .skipDiscovery()
+            .name("foo")
+            .addLabel("k1", "v1")
+            .execute();
+
+    V1Node unlabelledNode =
+            Kubectl.label(V1Node.class)
+                    .apiClient(apiClient)
+                    .skipDiscovery()
+                    .name("foo")
+                    .deleteLabel("k1")
+                    .execute();
+    wireMockRule.verify(2, getRequestedFor(urlPathEqualTo("/api/v1/nodes/foo")));
+    wireMockRule.verify(2, putRequestedFor(urlPathEqualTo("/api/v1/nodes/foo")));
+    assertNotNull(unlabelledNode);
+  }
+
+
   @Test
   public void testKubectlLabelClusterResourceReceiveForbiddenShouldThrowException()
       throws KubectlException {