add instrumented serivce unit test of version

Change-Id: I21b65cd3a03528a1ea14a77d71feb7d2bf7b097e

pkg/kubelet/kuberuntime/instrumented_services_test.go

@@ -59,3 +59,11 @@ func TestRecordOperation(t *testing.T) {
 		mux.ServeHTTP(w, r)
 	}), "GET", prometheusUrl, nil, runtimeOperationsLatencyExpected)
 }
+
+func TestInstrumentedVersion(t *testing.T) {
+	fakeRuntime, _, _, _ := createTestRuntimeManager()
+	irs := newInstrumentedRuntimeService(fakeRuntime)
+	vr, err := irs.Version("1")
+	assert.NoError(t, err)
+	assert.Equal(t, kubeRuntimeAPIVersion, vr.Version)
+}