Better wording for the new test

__tests__/fixtures/not_supported.yml

@@ -1,2 +1,2 @@
 label:
-  - unknown-check: 'this-check-is-not-supported'
+  - unknown: 'this-is-not-supported'

__tests__/main.test.ts

@@ -49,7 +49,7 @@ describe('run', () => {
     expect(addLabelsMock).toHaveBeenCalledTimes(0);
   });
 
-  it('does not add a label when no match config options match', async () => {
+  it('does not add a label when the match config options are not supported', async () => {
     usingLabelerConfigYaml('not_supported.yml');
     await run();