test for #8293

[FranckFreiburger]

What kind of change does this PR introduce?
this highlights issue #8293

Did you add tests for your changes?

Does this PR introduce a breaking change?
no

What needs to be documented once your changes are merged?
nothing

[webpack-bot]

For maintainers only:

• This need to be documented (issue in webpack/webpack.js.org will be filed when merged)

[webpack-bot]

The basic integration tests failed.

@FranckFreiburger Please review the following output log for errors:

 FAIL  test/ConfigTestCases.test.js (23.049s)
  ● ConfigTestCases › plugins › define-plugin › exported tests › should expand properly

    expect(function).not.toThrowError(type)

    Expected the function not to throw an error of type:
      "ReferenceError"
    Instead, it threw:
      ReferenceError: A_DOT_J is not defined
          239 | 	var tmp = '';
          240 | 	expect(function() {
        > 241 | 		__webpack_require__(2)('./' + A_DOT_J + tmp + 's');
              | 		                              ^
          242 | 	}).not.toThrowError(ReferenceError, "A_DOT_J is not defined");
          243 | });
          244 | 
    
          at test/js/config/plugins/define-plugin/bundle0.js:241:33
          at Object.<anonymous> (node_modules/expect/build/to_throw_matchers.js:51:9)
          at Object.throwingMatcher [as toThrowError] (node_modules/expect/build/index.js:320:33)
          at test/js/config/plugins/define-plugin/bundle0.js:242:9
          at Object.<anonymous> (test/helpers/createLazyTestEnv.js:12:13)

      240 | 	expect(function() {
      241 | 		__webpack_require__(2)('./' + A_DOT_J + tmp + 's');
    > 242 | 	}).not.toThrowError(ReferenceError, "A_DOT_J is not defined");
          | 	       ^
      243 | });
      244 | 
      245 | 

      at test/js/config/plugins/define-plugin/bundle0.js:242:9
      at Object.<anonymous> (test/helpers/createLazyTestEnv.js:12:13)

Test Suites: 1 failed, 2 passed, 3 total
Tests:       1 failed, 8 skipped, 1801 passed, 1810 total
Snapshots:   87 passed, 87 total
Time:        30.399s

See complete report here.