@Test
public void successfulExecutionWithAckExpression() throws Exception {
String ackExpression = "some-expression";
String expressionEvalutaionResult = "new payload";
event.setMessage(spy(event.getMessage()));
when(mockUntilSuccessfulConfiguration.getAckExpression()).thenReturn(ackExpression);
when(mockUntilSuccessfulConfiguration
.getMuleContext()
.getExpressionManager()
.evaluate(ackExpression, event))
.thenReturn(expressionEvalutaionResult);
SynchronousUntilSuccessfulProcessingStrategy processingStrategy = createProcessingStrategy();
when(mockRoute.process(event)).thenReturn(event);
assertThat(processingStrategy.route(event), is(event));
verify(mockRoute).process(event);
verify(mockUntilSuccessfulConfiguration.getMuleContext().getExpressionManager())
.evaluate(ackExpression, event);
verify(event.getMessage()).setPayload(expressionEvalutaionResult);
}
