OCMock只生效一次，奇怪，为什么？或者我这边有什么问题？

Question

我想为 TnSettings 做 mock，是的，如果通过以下方法编写代码，它就可以工作，问题是我们需要为每个案例编写 mock 代码，如果我们只 mock 一次然后执行多个案例，那么第二个将报告异常。我用的是最新的OCMock V2.01。

我的问题是为什么OCMock有这样的限制？还是我没有正确使用它是我的错？

任何想法或讨论将不胜感激，在此先感谢。

- (void) testFormattedDistanceValueWithMeters {         
        mockSettings = [OCMockObject mockForClass:[TnSettings class]];
        mockClientModel = [TnClientModel createMockClientModel];
        [[[mockClientModel expect] andReturn:mockSettings] settings];
        [[[mockSettings expect] andReturn:[NSNumber numberWithInt:0]] preferencesGeneralUnits];

        NSNumber *meters = [NSNumber numberWithDouble:0.9];
        distance = [NSString formattedDistanceValueWithMeters:meters];
        STAssertEqualObjects(distance, @"0.9", @"testformattedEndTimeForTimeInSeconds failed");

        //------------- Another case -----------------
        mockSettings = [OCMockObject mockForClass:[TnSettings class]];
        mockClientModel = [TnClientModel createMockClientModel];
        [[[mockClientModel expect] andReturn:mockSettings] settings];
        [[[mockSettings expect] andReturn:[NSNumber numberWithInt:0]] preferencesGeneralUnits];

        meters = [NSNumber numberWithDouble:100.9];
        distance = [NSString formattedDistanceValueWithMeters:meters];
        STAssertEqualObjects(distance, @"101", @"testformattedEndTimeForTimeInSeconds failed");
}

Answer 1

不确定我是否完全理解您的问题或您的代码。不过，我怀疑您无意中发现了 expect 和 stub 之间的区别。

这是你的想法吗？

- (void) testFormattedDistanceValueWithMeters {         
    mockSettings = [OCMockObject mockForClass:[TnSettings class]];
    mockClientModel = [TnClientModel createMockClientModel];
    [[[mockClientModel stub] andReturn:mockSettings] settings];
    [[[mockSettings stub] andReturn:[NSNumber numberWithInt:0]] preferencesGeneralUnits];

    NSNumber *meters = [NSNumber numberWithDouble:0.9];
    distance = [NSString formattedDistanceValueWithMeters:meters];
    STAssertEqualObjects(distance, @"0.9", @"testformattedEndTimeForTimeInSeconds failed");

    meters = [NSNumber numberWithDouble:100.9];
    distance = [NSString formattedDistanceValueWithMeters:meters];
    STAssertEqualObjects(distance, @"101", @"testformattedEndTimeForTimeInSeconds failed");