If you take the JUnit method's return type as 'string', the following would happen: The Junit testing tool would automatically convert the data type of the value returned by the tested method from its original type (e.g., int, boolean) to a string. This is because the 'junit.framework.TestResult' class, which is used to store the results of a test run, can only store data in the form of strings. As a result, any int or boolean values returned by the tested method would be converted to strings before being stored in the TestResult object. This could potentially lead to problems if the tested method relies on the data type of the returned values for its logic. For example, if a tested method were to return a boolean value of 'true' to indicate that a certain condition has been met, and this value were converted to a string before being stored in the TestResult object, then theJunittesting tool would not be able to properly interpret the meaning of this return value.