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TestHelper's shouldFail in JDK 8
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| import java.util.Arrays; | |
| import java.util.List; | |
| public class TestHelper { | |
| public static Throwable shouldFail(Runnable code) { | |
| try { | |
| code.run(); | |
| } catch (Throwable ex) { | |
| return ex; | |
| } | |
| throw new AssertionError("no exception thrown!"); | |
| } | |
| public static <T extends Throwable> T shouldFail(Class<T> clazz, Runnable code) { | |
| try { | |
| code.run(); | |
| } catch (Throwable ex) { | |
| if (clazz.isInstance(ex)) { | |
| return (T) ex; | |
| } | |
| throw new AssertionError("expected: " + clazz.getName() + ", got: " + ex.getClass().getName()); | |
| } | |
| throw new AssertionError("expected: " + clazz.getName() + " but no exception thrown!"); | |
| } | |
| public static void main(String[] args) { | |
| shouldFail(() -> { | |
| List<Integer> list = Arrays.asList(1, 2, 3); | |
| list.get(3); | |
| }); | |
| shouldFail(ArrayIndexOutOfBoundsException.class, () -> { | |
| List<Integer> list = Arrays.asList(1, 2, 3); | |
| list.get(3); | |
| }); | |
| try { | |
| shouldFail(IllegalArgumentException.class, () -> { | |
| List<Integer> list = Arrays.asList(1, 2, 3); | |
| list.get(3); | |
| }); | |
| } catch (AssertionError e) {} | |
| try { | |
| shouldFail(IllegalArgumentException.class, () -> { | |
| List<Integer> list = Arrays.asList(1, 2, 3); | |
| list.get(0); | |
| }); | |
| } catch (AssertionError e) {} | |
| } | |
| } |
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