@Test(expected = BusinessGlobalTransactionInstableException.class)
public void testStartGlobalTransactionWhenGTXNotNull() {

    // Setup
    final RequestGlobalTransaction rgt = mock(RequestGlobalTransaction.class);
    when(rgt.getGTX()).thenReturn(anyString());
    // Run the test
    businessGlobalTransactionServiceImplUnderTest.startNewGlobalTransaction(rgt);
}