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Quite useful.
At this point, we haven't started adding JUnit 8-focused features, but I
believe we plan to soon. Does that sound right, Marc?
Thanks,
David
On Tue, May 19, 2015 at 1:06 AM, Johannes [email protected] [junit] <
[email protected]> wrote:
>
>
> Hello,
>
> I always found testing thrown exceptions tedious, since it required a
> new test method for every exception that shall be thrown.
> Since the introduction of Java 8 lambda expressions I found this new
> idiom to be quite useful:
>
> @Test
> public void testIndexOutOfBoundsIsThrown() {
> List<Object> l =3D new ArrayList<>();
> assertException(() -> l.add(-1, new Object()));
> assertException(() -> l.add(1, new Object()),
> IndexOutOfBoundsException.class);
> }
>
> Here is the code for the assertions:
>
> public static void assertException(Runnable r) {
> assertException(r, Exception.class);
> }
>
> public static void assertException(Runnable r, Class<? extends
> Exception> exceptionClass) {
> try {
> r.run();
> fail("expected " + exceptionClass.getName());
> } catch (Exception e) {
> Assert.assertTrue("expected " + exceptionClass + " but was
> " + e,
> exceptionClass.isAssignableFrom(e.getClass()));
> }
> }
>
> What do you think?
> If you like the idea, I can create a pull request on github.
>
> Johannes
>=20=20
>
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<div dir=3D"ltr">Quite useful.<div><br></div><div>At this point, we haven&#=
39;t started adding JUnit 8-focused features, but I believe we plan to soon=
.=C2=A0 Does that sound right, Marc?</div><div><br></div><div>Thanks,</div>=
<div><br></div><div>=C2=A0 =C2=A0David</div></div><div class=3D"gmail_extra=
"><br><div class=3D"gmail_quote">On Tue, May 19, 2015 at 1:06 AM, Johannes =
<a href=3D"mailto:[email protected]">[email protected]</a> [jun=
it] <span dir=3D"ltr"><<a href=3D"mailto:[email protected]" target=
=3D"_blank">[email protected]</a>></span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex">
<u></u>
=20
<div style=3D"background-color:#fff">
<span>=C2=A0</span>
<div>
<div>
<div>
=20=20=20=20=20=20
=20=20=20=20=20=20
<p>Hello,<br>
<br>
I always found testing thrown exceptions tedious, since it required a <br>
new test method for every exception that shall be thrown.<br>
Since the introduction of Java 8 lambda expressions I found this new <br>
idiom to be quite useful:<br>
<br>
@Test<br>
public void testIndexOutOfBoundsIsThrown() {<br>
List<Object> l =3D new ArrayList<>();<br>
assertException(() -> l.add(-1, new Object()));<br>
assertException(() -> l.add(1, new Object()), <br>
IndexOutOfBoundsException.class);<br>
}<br>
<br>
Here is the code for the assertions:<br>
<br>
public static void assertException(Runnable r) {<br>
assertException(r, Exception.class);<br>
}<br>
<br>
public static void assertException(Runnable r, Class<? extends <br>
Exception> exceptionClass) {<br>
try {<br>
r.run();<br>
fail("expected " + exceptionClass.getName());<br>
} catch (Exception e) {<br>
Assert.assertTrue("expected " + exceptionClass + &qu=
ot; but was <br>
" + e,<br>
exceptionClass.isAssignableFrom(e.getClass()));<br>
}<br>
}<br>
<br>
What do you think?<br>
If you like the idea, I can create a pull request on github.<br>
<br>
Johannes<br>
</p>
</div>
=20=20=20=20=20
=20=20=20=20
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</div>
=20=20
</blockquote></div><br></div>
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