test: Integration Test for Unique Attribute Behavior

Adding an integration test for behavior influenced by:

* JiLiZART/BBob#202

We decided (better: will decide with subsequent commits) to accept
the possible flaw as corner case, that a URL tag like

```
[url=onclick]T[/url]
```

will still get the `onclick` value removed, as it is denoted in
as `onclick=onclick` in attributes (concept of unique attributes as
it is now in BBob).

If these tests fail, we have to revisit corresponding code and see,
if we need or can adapt something.

packages/ckeditor5-bbcode/__tests__/bbob/ckeditor5Preset.test.ts

@@ -140,6 +140,34 @@ describe("ckeditor5Preset", () => {
     });
   });
 
+  /**
+   * These tests demonstrate flawed behaviors, thus, known bugs, we may ignore
+   * or have to deal with. If any of these tests fail, a corresponding issue
+   * raised at BBob may have been fixed meanwhile.
+   *
+   * If you happen to see a test failing, search for the referenced issue ID
+   * within our sources and see, if corresponding actions are required.
+   *
+   * Added tests in here should reference an issue and specify a type, thus,
+   * if we just accepted it as known issue, or if we had to apply a workaround.
+   */
+  describe("BBob Flawed Behaviors", () => {
+    // noinspection HtmlUnknownTarget
+    test.each`
+      bbcode                                                       | expected                                                  | issue                                            | comment
+      ${`[url fakeUnique=fakeUnique]T[/url]`}                      | ${`<a href="fakeUnique">T</a>`}                           | ${`https://github.com/JiLiZART/BBob/issues/202`} | ${`getUniqAttr flaw. This test just demonstrates the symptom.`}
+      ${`[url=https://example.org/ fakeUnique=fakeUnique]T[/url]`} | ${`<a href="fakeUnique">T</a>`}                           | ${`https://github.com/JiLiZART/BBob/issues/202`} | ${`getUniqAttr flaw. Demonstrates accidental override.`}
+      ${`[url=https://example.org/ hidden]T[/url]`}                | ${`<a href="hidden">T</a>`}                               | ${`https://github.com/JiLiZART/BBob/issues/202`} | ${`getUniqAttr flaw. Demonstrates accidental override, but with more realistic use-case.`}
+      ${`[table=onclick][tr][td]T[/td][/tr][/table]`}              | ${`<table onclick="onclick"><tr><td>T</td></tr></table>`} | ${`https://github.com/JiLiZART/BBob/issues/202`} | ${`getUniqAttr flaw. Only applicable, if mapping rules do not explicitly remove unhandled attributes.`}
+      ${`[table onclick=onclick][tr][td]T[/td][/tr][/table]`}      | ${`<table onclick="onclick"><tr><td>T</td></tr></table>`} | ${`https://github.com/JiLiZART/BBob/issues/202`} | ${`getUniqAttr flaw. Only applicable, if mapping rules do not explicitly remove unhandled attributes.`}
+    `(
+      "[$#] Expected flawed behavior: '$bbcode' to '$expected' ($issue, $comment)",
+      ({ bbcode, expected }: { bbcode: string; expected: string }) => {
+        expect(parse(bbcode)).toBe(expected);
+      },
+    );
+  });
+
   describe("CKEditor 5 Data View Specific Adaptations", () => {
     // We have overridden the behavior to also include a nested `<code>`
     // element.
@@ -169,7 +197,7 @@ describe("ckeditor5Preset", () => {
         ${`[quote]Lorem[list][*]Ipsum[/list][/quote]`} | ${`<blockquote><p>Lorem</p><ul><li>Ipsum</li></ul></blockquote>`}               | ${`quote: handle nested block-level elements properly`}
         ${`[list][*]Lorem\n\nIpsum\n[/list]`}          | ${`<ul><li><p>Lorem</p><p>Ipsum</p></li></ul>`}                                 | ${`list/li: add each paragraph separately`}
         ${`Lorem\n\nipsum\n[quote]dolor[/quote]\nsit`} | ${`<p>Lorem</p><p>ipsum</p><blockquote><p>dolor</p></blockquote><p>\nsit</p>`}  | ${`Continue with paragraphs, once we added them on a given hierarchy level. Extra newline (sit) is within design scope.`}
-        ${`[b]Lorem\n\nIpsum[/b]`}                     | ${`<span style="font-weight: bold;">Lorem\n\nIpsum</span>`}                       | ${`no paragraphs within inline tags`}
+        ${`[b]Lorem\n\nIpsum[/b]`}                     | ${`<span style="font-weight: bold;">Lorem\n\nIpsum</span>`}                     | ${`no paragraphs within inline tags`}
       `(
         "[$#] Should transform $bbcode to: $expected ($comment)",
         ({ bbcode, expected }: { bbcode: string; expected: string }) => {