FilterExpression implements Expression, Configurable { @Override public void addChildren(Deque<Expression> expressions) { if (expression != null) { expression.addChildren(expressions); } } 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();  }
@Test public void addChildren() { @SuppressWarnings("unchecked") Deque<Expression> expressions = mock(Deque.class); test.addChildren(expressions); verify(expr).addChildren(expressions); verifyNoMoreInteractions(expr); }