[LUCENE-7009] Add expectThrows utility to LuceneTestCase

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0
• Lucene Fields: New
• Assignee: Ryan Ernst
• Reporter: Ryan Ernst
• Created: 03/Feb/16 06:17
• Updated: 28/Aug/22 14:49
• Resolved: 03/Feb/16 20:21

Description

In junit5, a neat assertion method is added which makes testing expected
failures a little more straightforward. The block of code that is
expected to throw is passed in with a lambda expression, and the caught
exception returned for inspection. The usage looks something like this:

IOException e = expectThrows(IOException.class, () -> {
    throw new IOException("some io error");
});
// assert stuff here about the exception

We should add this to LuceneTestCase until junit5 is available.