Added DeleteCollection to the fake.Client

Author: Aaron

pkg/client/fake/client.go

@@ -161,6 +161,48 @@ func (c *fakeClient) Delete(ctx context.Context, obj runtime.Object, opts ...cli
 	return c.tracker.Delete(gvr, accessor.GetNamespace(), accessor.GetName())
 }
 
+func (c *fakeClient) DeleteCollection(ctx context.Context, obj runtime.Object, opts ...client.DeleteCollectionOptionFunc) error {
+	gvk, err := apiutil.GVKForObject(obj, scheme.Scheme)
+	if err != nil {
+		return err
+	}
+
+	if !strings.HasSuffix(gvk.Kind, "List") {
+		return fmt.Errorf("non-list type %T (kind %q) passed as input", obj, gvk)
+	}
+	// we need the non-list GVK, so chop off the "List" from the end of the kind
+	gvk.Kind = gvk.Kind[:len(gvk.Kind)-4]
+
+	dcOptions := client.DeleteCollectionOptions{}
+	dcOptions.ApplyOptions(opts)
+
+	gvr, _ := meta.UnsafeGuessKindToResource(gvk)
+	o, err := c.tracker.List(gvr, gvk, dcOptions.Namespace)
+	if err != nil {
+		return err
+	}
+
+	objs, err := meta.ExtractList(o)
+	if err != nil {
+		return err
+	}
+	filteredObjs, err := objectutil.FilterWithLabels(objs, dcOptions.LabelSelector)
+	if err != nil {
+		return err
+	}
+	for _, o := range filteredObjs {
+		accessor, err := meta.Accessor(o)
+		if err != nil {
+			return err
+		}
+		err = c.tracker.Delete(gvr, accessor.GetNamespace(), accessor.GetName())
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (c *fakeClient) Update(ctx context.Context, obj runtime.Object) error {
 	gvr, err := getGVRFromObject(obj, c.scheme)
 	if err != nil {

pkg/client/fake/client_test.go

@@ -154,6 +154,18 @@ var _ = Describe("Fake client", func() {
 			Expect(list.Items).To(HaveLen(1))
 			Expect(list.Items).To(ConsistOf(*dep2))
 		})
+
+		It("should be able to Delete a Collection", func() {
+			By("Deleting a deploymentList")
+			err := cl.DeleteCollection(nil, &appsv1.DeploymentList{})
+			Expect(err).To(BeNil())
+
+			By("Listing all deployments in the namespace")
+			list := &appsv1.DeploymentList{}
+			err = cl.List(nil, list, client.InNamespace("ns1"))
+			Expect(err).To(BeNil())
+			Expect(list.Items).To(BeEmpty())
+		})
 	}
 
 	Context("with default scheme.Scheme", func() {