Add a regression test for handling of /// comments

#1153

PiperOrigin-RevId: 673574143

Author: cushon

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

@@ -72,6 +72,8 @@ public class FormatterIntegrationTest {
               "I981",
               "I1020",
               "I1037")
+          // TODO: https://github.com/google/google-java-format/issues/1153
+          // .putAll(23, "I1153")
           .build();
 
   @Parameters(name = "{index}: {0}")

core/src/test/resources/com/google/googlejavaformat/java/testdata/I1153.input

@@ -0,0 +1,15 @@
+class I1153 {
+  void f() {
+    //// (1) one
+    int one;
+
+    //// (2) two
+    int two;
+
+    //// (2.1) if we need to collect data using multiple different collectors, e.g. taxonomy and
+    ////       ranges, or even two taxonomy facets that use different Category List Field, we can
+    ////       use MultiCollectorManager, e.g.:
+    // TODO: This should be (2.1) two point one
+    int twoPointOne;
+  }
+}

core/src/test/resources/com/google/googlejavaformat/java/testdata/I1153.output

@@ -0,0 +1,15 @@
+class I1153 {
+  void f() {
+    //// (1) one
+    int one;
+
+    //// (2) two
+    int two;
+
+    //// (2.1) if we need to collect data using multiple different collectors, e.g. taxonomy and
+    ////       ranges, or even two taxonomy facets that use different Category List Field, we can
+    ////       use MultiCollectorManager, e.g.:
+    // TODO: This should be (2.1) two point one
+    int twoPointOne;
+  }
+}