test/jdk/java/util/TimeZone/CLDRDisplayNamesTest.java

*** 1,7 ****
  /*
!  * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 71,80 ****
--- 71,82 ----
              //"Nordamerikanische Westk\u00fcstenzeit",
          //"PT",
          },
      };
  
+     private static final String NO_INHERITANCE_MARKER = "\u2205\u2205\u2205";
+ 
      public static void main(String[] args) {
          // Make sure that localized time zone names of CLDR are used
          // if specified.
          TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
          int errors = 0;
*** 129,135 ****
--- 131,159 ----
              errors++;
          }
          if (errors > 0) {
              throw new RuntimeException("test failed");
          }
+ 
+         // 8217366: No "no inheritance marker" should be left in the returned array
+         // from DateFormatSymbols.getZoneStrings()
+         List.of(Locale.ROOT,
+                 Locale.CHINA,
+                 Locale.GERMANY,
+                 Locale.JAPAN,
+                 Locale.UK,
+                 Locale.US,
+                 Locale.forLanguageTag("hi-IN"),
+                 Locale.forLanguageTag("es-419")).stream()
+             .peek(System.out::println)
+             .map(l -> DateFormatSymbols.getInstance(l).getZoneStrings())
+             .flatMap(zoneStrings -> Arrays.stream(zoneStrings))
+             .filter(namesArray -> Arrays.stream(namesArray)
+                 .anyMatch(aName -> aName.equals(NO_INHERITANCE_MARKER)))
+             .findAny()
+             .ifPresentOrElse(marker -> {
+                     throw new RuntimeException("No inheritance marker detected with tzid: "
+                                                 + marker[0]);
+                 },
+                 () -> System.out.println("Success: No \"no inheritance marker\" detected."));
      }
  }