Misspelling in core/modules/simpletest/src/Tests/SimpleTestTest.php

Just checked, it's still there.

Line 177 of the file core/modules/simpletest/src/Tests/SimpleTestTest.php

For context, here's the surrounding code.

    catch (\AssertionError $e) {
      try {
        // Now test with an error message to insure it is correctly passed
        // along by the rethrow.
        assert(FALSE, 'Lorem Ipsum');
      }
      catch ( \AssertionError $e ) {
        $this->assertEqual($e->getMessage(), 'Lorem Ipsum', 'Runtime assertions Enabled and running.');
      }
    }

Note - this error got popped in only a couple days ago - to see it (and do development on Drupal in general) you need to check out core from git: https://www.drupal.org/project/drupal/git-instructions

The packaged beta releases only occur once a month, and they rapidly fall behind the repository HEAD.

K, looks good. I'll go ahead and mark as RTBC now since we're only dealing with comment text. Congratulations on your first patch.