In Mockito Flutter how to write a matcher to match Any except specified?

Question

To set the context, I am trying to do this in Flutter.

For example,

I have a test that passes, "if I set my mock to say 'no network connection' and expect 'NetworkUnavailable' to result."

Then, I thought to write next test that "if network is available, result could be anything except 'NetworkUnavailable'"

I am struggling to setup an expect matcher for that. Does Mockito has something for this, something like AnyExcept([matcher])?

Thanks.

Solution

There is an isNot Matcher that you can combine with other Matchers. So, for example, you should be able to do something like: expect(valueToTest, isNot(unwantedValue)); or expect(valueToTest, isNot(isIn([unwantedValue1, unwantedValue2])));

If that doesn't do quite what you want, you also can use the predicate to easily create your own Matcher from a boolean function.

(You might not have found these if you were searching the Mockito documentation because they're part of package:matcher (normally included as part of package:test); they're used for unit tests in general, not just for mocks.)

Comments

[Saran]

Perfect. Thanks.