test/jdk/tools/jmod/hashes/HashesTest.java

*** 235,244 ****
--- 235,266 ----
          Stream.concat(jars.stream(), jmods.stream())
                .filter(mn -> !mn.equals("j1") && !mn.equals("j2"))
                .forEach(mn -> assertTrue(ht.hashes(mn) == null));
      }
  
+     @Test
+     public static void upgradeableModule() throws IOException {
+         Path mpath = Paths.get(System.getProperty("java.home"), "jmods");
+         if (!Files.exists(mpath)) {
+             return;
+         }
+ 
+         Path dest = Paths.get("test4");
+         HashesTest ht = new HashesTest(dest);
+         ht.makeModule("m1");
+         ht.makeModule("java.compiler", "m1");
+         ht.makeModule("m2", "java.compiler");
+ 
+         ht.makeJmod("m1");
+         ht.makeJmod("m2");
+         ht.makeJmod("java.compiler",
+                     "--module-path",
+                     ht.lib.toString() + File.pathSeparator + mpath,
+                     "--hash-modules", "java\\.(?!se)|^m.*");
+ 
+         ht.checkHashes("java.compiler",  "m2");
+     }
      
      @Test
      public static void testImageJmods() throws IOException {
          Path mpath = Paths.get(System.getProperty("java.home"), "jmods");
          if (!Files.exists(mpath)) {