replace repeated values with a constant

cmd/kubeadm/app/constants/constants.go

@@ -179,6 +179,8 @@ const (
 	UpdateNodeTimeout = 2 * time.Minute
 	// TLSBootstrapTimeout specifies how long kubeadm should wait for the kubelet to perform the TLS Bootstrap
 	TLSBootstrapTimeout = 2 * time.Minute
+	// PrepullImagesInParallelTimeout specifies how long kubeadm should wait for prepulling images in parallel before timing out
+	PrepullImagesInParallelTimeout = 10 * time.Second
 
 	// DefaultControlPlaneTimeout specifies the default control plane (actually API Server) timeout for use by kubeadm
 	DefaultControlPlaneTimeout = 4 * time.Minute

cmd/kubeadm/app/phases/upgrade/prepull_test.go

@@ -116,25 +116,25 @@ func TestPrepullImagesInParallel(t *testing.T) {
 		{
 			name:        "should error out; create failed",
 			p:           NewFailedCreatePrepuller(),
-			timeout:     10 * time.Second,
+			timeout:     constants.PrepullImagesInParallelTimeout,
 			expectedErr: true,
 		},
 		{
 			name:        "should error out; timeout exceeded",
 			p:           NewForeverWaitPrepuller(),
-			timeout:     10 * time.Second,
+			timeout:     constants.PrepullImagesInParallelTimeout,
 			expectedErr: true,
 		},
 		{
 			name:        "should error out; delete failed",
 			p:           NewFailedDeletePrepuller(),
-			timeout:     10 * time.Second,
+			timeout:     constants.PrepullImagesInParallelTimeout,
 			expectedErr: true,
 		},
 		{
 			name:        "should work just fine",
 			p:           NewGoodPrepuller(),
-			timeout:     10 * time.Second,
+			timeout:     constants.PrepullImagesInParallelTimeout,
 			expectedErr: false,
 		},
 	}