### Question:
MultipleInstanceActivityPropertyWriter extends ActivityPropertyWriter { public void setInput(String name) { setInput(name, true); } MultipleInstanceActivityPropertyWriter(Activity activity,
                                                  VariableScope variableScope,
                                                  Set<DataObject> dataObjects); void setCollectionInput(String collectionInput); void setCollectionOutput(String collectionOutput); void setInput(String name); void setOutput(String name); void setOutput(String name, boolean addDataOutputAssociation); void setCompletionCondition(String expression); void setIsSequential(boolean sequential);  }### Answer:
@Test public void testSetInputNotFailed() { writer.setInput(null, false); writer.setInput("", false); assertNull(activity.getIoSpecification()); assertTrue(activity.getDataInputAssociations().isEmpty()); assertNull(activity.getLoopCharacteristics()); }
@Test public void testSetEmptyVariable() { final String emptyName = ""; writer.setInput(":", false); assertInputsInitialized(); String inputId = ACTIVITY_ID + "_" + "InputX"; String itemSubjectRef = ACTIVITY_ID + "_multiInstanceItemType_"; assertHasDataInput(activity.getIoSpecification(), inputId, itemSubjectRef, emptyName); assertDontHasDataInputAssociation(activity, INPUT_VARIABLE_ID, inputId); }