Use require for empty assertion

Signed-off-by: Devanshu <[email protected]>

Author: devanshuVmware

cli/pkg/kctrl/cmd/app/release/release_cmd_runner_test.go

@@ -11,11 +11,8 @@ import (
 func TestReleaseCmdRunnerForKappCmd(t *testing.T) {
 	var buf bytes.Buffer
 	ReleaseCmdRunner := NewReleaseCmdRunner(&buf, false, "", false, nil)
-	cmd := exec.Command("kapp", "deploy", "-f", "-", "-a", "pkg-test", "-y")
+	cmd := exec.Command("kapp", "deploy", "-f", "https://github.com/carvel-dev/kapp-controller/releases/latest/download/release.yml", "-a", "pkg-test", "-y")
 	err := ReleaseCmdRunner.RunWithCancel(cmd, nil)
 	require.NoError(t, err)
-	expectedLength := 0
-	if actualLength := buf.Len(); actualLength != expectedLength {
-		t.Errorf("Got Buffer length = %d, Expected empty", actualLength)
-	}
+	require.Emptyf(t, buf.Len(), "Expected buf length 0 but got %d", buf.Len())
 }