FilterExpression implements Expression, Configurable { @Override public String[] getHelp() { if (expression != null) { return expression.getHelp(); } return null; } 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 getHelp() { String[] help = new String[] { "Help 1", "Help 2", "Help 3" }; when(expr.getHelp()).thenReturn(help); assertArrayEquals(help, test.getHelp()); verify(expr).getHelp(); verifyNoMoreInteractions(expr); }