如何使用XCTest对脱机方案进行单元测试

Question

I'm trying to perform a set of unit tests, which require different network connection statuses. How can I simulate an offline iOS device when using XCTest (in Swift)?

Thanks

Answer 1

There are more than one approaches to this problem.

Mocking/Stubbing is one, you can use a mocking framework like OCMock or OCMockito and force the method return what you need for each test.

The alternative "classic" approach (which I prefer) is implementing a stub/dummy class that shares the same API with the networking class and again have it return what you need for each test.

The difference is mostly of philosophical nature

The bottom line is that you need a way to force the API to return what you want to test against.

Answer 2

In order to get real world situations, like loss packets, latency, you can install Network Link Conditioner (get it from Apple download center ), but will affect your pc and simulator. Also, you will needed to use asynchronous test ( check XCTestExpectation at this tutorial ) in order to wait for the responses or timeouts.

To do quick simple tests, you can run the unit tests on the iphone and simple set iphone to airplane mode.