In unit test, mocks are not cleaned beetween two tests (in same class)

Unit Tests failed if in two tests (in one TestClass) create a mock instance of the same class (see attached testcase).

Tests errors :

Running 2 unit tests... 1 of 2 Output from testFirstCall--

Running 2 unit tests... 2 of 2 Output from testSecondCall-- Failure: testSecondCall(com.zenika.MyControllerTests) junit.framework.AssertionFailedError: No more calls to 'callMe' expected at this point. End of demands. at grails.test.MockClosureProxy.doBeforeCall(MockClosureProxy.java:66) at grails.test.AbstractClosureProxy.call(AbstractClosureProxy.java:74) at com.zenika.MyController.index(MyController.groovy:10) at com.zenika.MyControllerTests.executeCallTest(MyControllerTests.groovy:31) at com.zenika.MyControllerTests.testSecondCall(MyControllerTests.groovy:19)

Completed 2 unit tests, 1 failed in 3238ms

Tests FAILED - view reports in target/test-reports