private final @Nullable Object[] passedArgs;
    private final @Nullable Object returnValue;
    private final AtomicInteger called = new AtomicInteger();

    InteractionTester(Class<T> interfaceType, Method method) {
      this.interfaceType = interfaceType;
      this.method = method;
      this.passedArgs = getParameterValues(method);
      this.returnValue = new FreshValueGenerator().generateFresh(method.getReturnType());
    }

    private final @Nullable Object[] passedArgs;
    private final @Nullable Object returnValue;
    private final AtomicInteger called = new AtomicInteger();

    InteractionTester(Class<T> interfaceType, Method method) {
      this.interfaceType = interfaceType;
      this.method = method;
      this.passedArgs = getParameterValues(method);
      this.returnValue = new FreshValueGenerator().generateFresh(method.getReturnType());
    }