Add a test to demonstrate our current handling of Javadoc that starts with a MOE comment.

(I haven't checked what the actual rendered Javadoc would look like for such Javadoc, including what happens to the summary fragment. It might well be a bad idea.)

I hope to change the behavior in unknown commit.

PiperOrigin-RevId: 945817704

Author: cpovirk

core/src/test/java/com/google/googlejavaformat/java/JavadocFormattingTest.java

@@ -254,6 +254,32 @@ class Test {}
     doFormatTest(input, expected);
   }
 
+  @Test
+  public void moeCommentAtStartOfDoc() {
+    String input =
+        """
+        /**
+         * <!-- moe:begin_intracomment_strip -->
+         * Foo.
+         * <!-- moe:end_intracomment_strip -->
+         */
+        class Test {}\
+        """
+            .replace("moe", "MOE");
+    String expected =
+        """
+        /**
+         *
+         * <!-- moe:begin_intracomment_strip -->
+         * Foo.
+         * <!-- moe:end_intracomment_strip -->
+         */
+        class Test {}
+        """
+            .replace("moe", "MOE");
+    doFormatTest(input, expected);
+  }
+
   @Test
   public void tableMostlyUntouched() {
     String input =