您可以使用async/await
在飞镖中。这会大大简化你的功能:
function(DoSomething x, DoSomething y) async {
final result = await x.doSomethingAsync();
if (result != null) {
y.doSomething();
}
}
这样,函数才会完成,直到x.doSomething
已完成。然后您可以使用相同的方法测试您的功能async/await
带有 async 的运算符test
.
你会有这个:
test('test my function', () async {
await function(x, y);
});
好的,但是我如何测试函数是否被调用?
为此,您可以使用mockito https://pub.dartlang.org/packages/mockito这是用于测试目的的模拟包。
假设您的 x/y 类别是:
class DoSomething {
Future<Object> doSomethingAsync() async {}
void doSomething() {}
}
然后你可以通过使用 Mockito 来模拟你的类方法:
// Mock class
class MockDoSomething extends Mock implements DoSomething {
}
最后,您可以通过执行以下操作在测试中使用该模拟:
test('test my function', () async {
final x = new MockDoSomething();
final y = new MockDoSomething();
// test return != null
when(x.doSomethingAsync()).thenReturn(42);
await function(x, y);
verifyNever(x.doSomething());
verify(x.doSomethingAsync()).called(1);
// y.doSomething must not be called since x.doSomethingAsync returns 42
verify(y.doSomething()).called(1);
verifyNever(y.doSomethingAsync());
// reset mock
clearInteractions(x);
clearInteractions(y);
// test return == null
when(x.doSomethingAsync()).thenReturn(null);
await function(x, y);
verifyNever(x.doSomething());
verify(x.doSomethingAsync()).called(1);
// y must not be called this x.doSomethingAsync returns null here
verifyZeroInteractions(y);
});