[javadoc] IDEA-370761 IDEA-377509 IDEA-378914 Add test to avoid regressions

For a reason that I did not investigate, the issue doesn't manifest on the master branch. It does on the release version (2025.2) though, so this test should act as a safeguard.

GitOrigin-RevId: 5cdc932f15d444af6fe40cf2781dcce66f4e27ac

java/java-tests/testData/codeInsight/overrideImplement/afterMarkdownComment.java

@@ -0,0 +1,14 @@
+public interface GenericInterfaceWithMarkdown<A> {
+
+  /// For some reason, markdown comments break
+  /// generated implementation in the current release (2025.2)
+  /// but not on master, so here's a test
+  A functionWithMarkdown();
+}
+
+class DefaultImpl implements GenericInterfaceWithMarkdown<String> {
+    @Override
+    public String functionWithMarkdown() {
+        return "";
+    }
+}

java/java-tests/testData/codeInsight/overrideImplement/beforeMarkdownComment.java

@@ -0,0 +1,11 @@
+public interface GenericInterfaceWithMarkdown<A> {
+
+  /// For some reason, markdown comments break
+  /// generated implementation in the current release (2025.2)
+  /// but not on master, so here's a test
+  A functionWithMarkdown();
+}
+
+class DefaultImpl implements GenericInterfaceWithMarkdown<String> {
+    <caret>
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/OverrideImplementTest.java

@@ -702,6 +702,10 @@ public class OverrideImplementTest extends LightJavaCodeInsightFixtureTestCase {
     doTest(true);
   }
 
+  public void testMarkdownComment() {
+    doTest(true);
+  }
+
   private void doTest(boolean toImplement) {
     final String name = getTestName(false);
     myFixture.configureByFile("before" + name + ".java");