Kotlin Mockito如何验证分配？

是的，我知道我不应该测试状态，而应该测试行为，但Android AdMob实现要求我将

FullScreenContentCallback

分配给返回的

Interstitalad

，我想测试它是否发生：

 override fun onAdLoaded(ad: InterstitialAd) {
                ad.fullScreenContentCallback = FullscreenPluginCallback(InterstitialAdPluginPluginEvent, notifyListenersFunction)
            }

我需要测试是否分配了

ad.fullScreenContentCallback

。我试过了

   listener.onAdLoaded(interstitialAdMock)

    assertNotNull(interstitialAdMock.fullScreenContentCallback)

                AdInterstitialExecutor.interstitialAd = null
                var contentCallback: FullScreenContentCallback? = null

                Mockito.`when`(interstitialAdMock.fullScreenContentCallback).thenReturn(contentCallback)
                val listener = InterstitialAdCallbackAndListeners.getInterstitialAdLoadCallback(pluginCall, notifierMock)
                // ACt
                listener.onAdLoaded(interstitialAdMock)

                assertNotNull(contentCallback)