Mock Behavior Guide

How to Establish Mock Behavior

We have three ways to establish mock method behaviors.

Name	Description	Scenario
Returning	Return a value	When the mocked method simply needs to return something
Throwing	Throw an exception	When the mocked method needs to throw an exception
Answering	Delegate the call to a Func	When the mocked method needs more than simply returning something

Here is how we establish a mock method behavior by returning.

T.when(mock.run(0)).thenReturn(0);
// When mock calls 'run' with 0, return 0

Here is how we establish a mock method behavior by throwing.

T.when(mock.run(0)).thenThrow(new T.TestException('test'));
// When mock calls 'run' with 0, throw the exception

Here is how we establish a mock method behavior by answering.

T.when(mock.run(0)).thenAnswer(R.inc);
// When mock calls 'run' with 0, apply the answer Func to the arguments
// and return the result

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