### Question:
FilterExpression implements Expression, Configurable { @Override public void addArguments(Deque<String> args) { if (expression != null) { expression.addArguments(args); } } protected  FilterExpression(Expression expression); @Override void setOptions(FindOptions options); @Override void prepare(); @Override Result apply(PathData item, int depth); @Override void finish(); @Override String[] getUsage(); @Override String[] getHelp(); @Override boolean isAction(); @Override boolean isOperator(); @Override int getPrecedence(); @Override void addChildren(Deque<Expression> expressions); @Override void addArguments(Deque<String> args); @Override void setConf(Configuration conf); @Override Configuration getConf(); @Override String toString();  }### Answer:
@Test public void addArguments() { @SuppressWarnings("unchecked") Deque<String> args = mock(Deque.class); test.addArguments(args); verify(expr).addArguments(args); verifyNoMoreInteractions(expr); }