Add a regression test for b/369862572

PiperOrigin-RevId: 679372973

Author: cushon

core/src/main/java/com/google/errorprone/bugpatterns/MemberName.java

@@ -102,7 +102,8 @@ public Description matchClass(ClassTree tree, VisitorState state) {
  ClassSymbol symbol = getSymbol(tree);
  String name = tree.getSimpleName().toString();
  if (name.isEmpty() || isConformantUpperCamelName(name)) {
- // name.isEmpty() should not happen normally but could if there are errors.
+ // The name can be empty for enum member declarations, which are desugared early to class
+ // declarations.
  return NO_MATCH;
  }
  String renamed = suggestedClassRename(name);

core/src/test/java/com/google/errorprone/bugpatterns/MemberNameTest.java

@@ -622,4 +622,17 @@ public void className_underscore() {
  "}")
  .doTest();
  }
+
+ @Test
+ public void enumName() {
+ helper
+ .addSourceLines(
+ "Test.java", //
+ "enum Test {",
+ " ONE {",
+ " void f() {}",
+ " }",
+ "}")
+ .doTest();
+ }
 }