NoneVariablesCalculator implements VariablesCalculator { @Override public Map<String, Object> calculateInputVariables(DelegateExecution execution) { return Collections.emptyMap(); }  @Override Map<String, Object> calculateOutPutVariables(
        MappingExecutionContext mappingExecutionContext,
        Map<String, Object> availableVariables); @Override Map<String, Object> calculateInputVariables(DelegateExecution execution);  }
@Test public void calculateInputVariables_should_return_emptyMap() { DelegateExecution mock = mock(DelegateExecution.class); Map<String, Object> calculatedVariables = variablesCalculator .calculateInputVariables(mock); assertThat(calculatedVariables).isEmpty(); }