SpannableString 不适用于 Android 单元测试

Question

我尝试在单元测试中比较两个 SpannableStrings 文本，但收到错误：

java.lang.RuntimeException: Method toString in android.text.SpannableString not mocked. See http://g.co/androidstudio/not-mocked for details.

调试后，我验证在单元测试中根本无法使用 SpannableString 类。

测试实施：

java.lang.RuntimeException: Method toString in android.text.SpannableString not mocked. See http://g.co/androidstudio/not-mocked for details.

堆栈跟踪：

java.lang.RuntimeException: Method toString in android.text.SpannableString not mocked. See http://g.co/androidstudio/not-mocked for details.

at android.text.SpannableString.toString(SpannableString.java)
at java.lang.String.valueOf(String.java:2994)
at view_model.ViewModelTest$When getCredits() returns multiple invites$1.invokeSuspend(ViewModelTest.kt:113)
at ViewModelTest$When getCredits() returns multiple invites$1.invoke(ViewModelTest.kt)
at kotlinx.coroutines.test.TestBuildersKt$runBlockingTest$deferred$1.invokeSuspend(TestBuilders.kt:50)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at kotlinx.coroutines.test.TestCoroutineDispatcher.dispatch(TestCoroutineDispatcher.kt:50)
at kotlinx.coroutines.internal.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:305) ...

showInvitesTextValue 变量初始化时发生错误。

如何在单元测试中使用 SpannableString 类？