我正在尝试在 iOS 项目中设置一个简单的 OCMock 单元测试,以熟悉框架。
我有一个模拟的 DataLoader
类,即使我自己调用该方法,我的期望也失败了:
- (void)testSimpleMocking {
// Mock the class
id mock = [OCMockObject niceMockForClass:[DataLoader class]];
// Override the 'dispatchLoadToAppDelegate:' to be a no-op
[[[mock stub] andReturn:nil] dispatchLoadToAppDelegate:[OCMArg any]];
// Expect the method to be called
[[mock expect] dispatchLoadToAppDelegate:[OCMArg any]];
// Call the method
[mock dispatchLoadToAppDelegate:nil];
// Verify
[mock verify];
}
但是,当我运行这个测试时,我收到错误:
/Users/Craig/projects/MyApp/Unknown.m: -[MockingDataLoaderTest testSimpleMocking] : OCMockObject[DataLoader]:
expected method was not invoked: dispatchLoadToAppDelegate:<OCMAnyConstraint: 0x1a3d890>
当我自己调用方法时,这怎么可能?
编辑:一个更复杂的案例:
- (void)testDataLoaderWaitsForDownload {
id mock = [OCMockObject niceMockForClass:[DataLoader class]];
id metadataItem = [OCMockObject niceMockForClass:[NSMetadataItem class]];
// Prepare NSMetadataItem
[[[metadataItem expect] andReturn:nil] valueForAttribute:NSMetadataItemURLKey];
// CODERUN
[mock waitForDownload:metadataItem thenLoad:YES];
//VERIFY
[metadataItem verify];
}
以及 waitForDownload:thenLoad:
方法的实现:
- (void)waitForDownload:(NSMetadataItem *)file thenLoad:(BOOL)load {
NSURL *metadataItemURL = [file valueForAttribute:NSMetadataItemURLKey];
...
失败并出现错误:
Unknown.m:0: error: -[MockingDataLoaderTest testDataLoaderWaitsForDownload] : OCMockObject[NSMetadataItem]: expected method was not invoked: valueForAttribute:@"kMDItemURL"
最佳答案
在您的测试中,stub
优先,因为它首先被调用。如果您调换 expect
和 stub
的顺序,您的测试应该会通过。
同时使用 expect
和 stub
的原因(具有相同的参数 expectations)是为了确保至少发生一次调用,然后响应后续的调用调用没有失败。
如果您真的只想调用一个方法,只需将 andReturn:
添加到 expect 子句中...
- (void)test_dispatchLoadToAppDelegate_isCalledExactlyOnce {
// Mock the class
id mock = [OCMockObject niceMockForClass:[DataLoader class]];
// Expect the method to be called
[[[mock expect] andReturn:nil] dispatchLoadToAppDelegate:[OCMArg any]];
// Call the method
[mock dispatchLoadToAppDelegate:nil];
// Verify
[mock verify];
}
另一种情况:
- (void)test_dispatchLoadToAppDelegate_isCalledAtLeastOnce {
// Mock the class
id mock = [OCMockObject niceMockForClass:[DataLoader class]];
// Expect the method to be called
[[[mock expect] andReturn:nil] dispatchLoadToAppDelegate:[OCMArg any]];
// Handle subsequent calls
[[[mock stub] andReturn:nil] dispatchLoadToAppDelegate:[OCMArg any]];
// Call the method
[mock dispatchLoadToAppDelegate:nil];
// Call the method (again for fun!)
[mock dispatchLoadToAppDelegate:nil];
// Verify
[mock verify];
}
对于这种特殊情况,看起来您可以使用 niceMockForClass
但如果您希望 stub 返回一个非零值,那么您必须调用 stub
无论哪种方式。
关于ios - OCMock "expected method was not invoked"即使我自己调用它,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17297618/