diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_env_test.go b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_env_test.go
index d58f6e05ab1..11d80a176ee 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_env_test.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_env_test.go
@@ -503,7 +503,7 @@ func TestSetEnvRemote(t *testing.T) {
 						if err != nil {
 							return nil, err
 						}
-						assert.Contains(t, string(bytes), `"value":`+`"`+"prod"+`"`, fmt.Sprintf("env not updated for %#v", input.object))
+						assert.Containsf(t, string(bytes), `"value":`+`"`+"prod"+`"`, "env not updated for %#v", input.object)
 						return &http.Response{StatusCode: http.StatusOK, Header: cmdtesting.DefaultHeader(), Body: objBody(input.object)}, nil
 					default:
 						t.Errorf("%s: unexpected request: %s %#v\n%#v", "image", req.Method, req.URL, req)
diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_image_test.go b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_image_test.go
index 3a026e8d45b..08ac463c632 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_image_test.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_image_test.go
@@ -641,7 +641,7 @@ func TestSetImageRemote(t *testing.T) {
 						if err != nil {
 							return nil, err
 						}
-						assert.Contains(t, string(bytes), `"image":`+`"`+"thingy"+`"`, fmt.Sprintf("image not updated for %#v", input.object))
+						assert.Containsf(t, string(bytes), `"image":`+`"`+"thingy"+`"`, "image not updated for %#v", input.object)
 						return &http.Response{StatusCode: http.StatusOK, Header: cmdtesting.DefaultHeader(), Body: objBody(input.object)}, nil
 					default:
 						t.Errorf("%s: unexpected request: %s %#v\n%#v", "image", req.Method, req.URL, req)
@@ -753,8 +753,8 @@ func TestSetImageRemoteWithSpecificContainers(t *testing.T) {
 						if err != nil {
 							return nil, err
 						}
-						assert.Contains(t, string(bytes), `"image":"`+"thingy"+`","name":`+`"nginx"`, fmt.Sprintf("image not updated for %#v", input.object))
-						assert.NotContains(t, string(bytes), `"image":"`+"thingy"+`","name":`+`"busybox"`, fmt.Sprintf("image updated for %#v", input.object))
+						assert.Containsf(t, string(bytes), `"image":"`+"thingy"+`","name":`+`"nginx"`, "image not updated for %#v", input.object)
+						assert.NotContainsf(t, string(bytes), `"image":"`+"thingy"+`","name":`+`"busybox"`, "image updated for %#v", input.object)
 						return &http.Response{StatusCode: http.StatusOK, Header: cmdtesting.DefaultHeader(), Body: objBody(input.object)}, nil
 					default:
 						t.Errorf("%s: unexpected request: %s %#v\n%#v", "image", req.Method, req.URL, req)
diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources_test.go b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources_test.go
index 957c31edf5d..38845c9334f 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources_test.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources_test.go
@@ -487,7 +487,7 @@ func TestSetResourcesRemote(t *testing.T) {
 						if err != nil {
 							return nil, err
 						}
-						assert.Contains(t, string(bytes), "200m", fmt.Sprintf("resources not updated for %#v", input.object))
+						assert.Containsf(t, string(bytes), "200m", "resources not updated for %#v", input.object)
 						return &http.Response{StatusCode: http.StatusOK, Header: cmdtesting.DefaultHeader(), Body: objBody(input.object)}, nil
 					default:
 						t.Errorf("%s: unexpected request: %s %#v\n%#v", "resources", req.Method, req.URL, req)
diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_serviceaccount_test.go b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_serviceaccount_test.go
index fbf2496d025..06a063be7b3 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/set/set_serviceaccount_test.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/set/set_serviceaccount_test.go
@@ -94,7 +94,7 @@ func TestSetServiceAccountLocal(t *testing.T) {
 			assert.NoError(t, err)
 			err = saConfig.Run()
 			assert.NoError(t, err)
-			assert.Contains(t, buf.String(), "serviceAccountName: "+serviceAccount, fmt.Sprintf("serviceaccount not updated for %s", input.yaml))
+			assert.Containsf(t, buf.String(), "serviceAccountName: "+serviceAccount, "serviceaccount not updated for %s", input.yaml)
 		})
 	}
 }
@@ -337,7 +337,7 @@ func TestSetServiceAccountRemote(t *testing.T) {
 						if err != nil {
 							return nil, err
 						}
-						assert.Contains(t, string(bytes), `"serviceAccountName":`+`"`+serviceAccount+`"`, fmt.Sprintf("serviceaccount not updated for %#v", input.object))
+						assert.Containsf(t, string(bytes), `"serviceAccountName":`+`"`+serviceAccount+`"`, "serviceaccount not updated for %#v", input.object)
 						return &http.Response{StatusCode: http.StatusOK, Header: cmdtesting.DefaultHeader(), Body: objBody(input.object)}, nil
 					default:
 						t.Errorf("%s: unexpected request: %s %#v\n%#v", "serviceaccount", req.Method, req.URL, req)