Disable NativeLibraryTest#testAvoidDumplicateLoads

This test basicly tests whether unloading works. It relies on the
runtime to unload the library when dlclose is called. This is not
required by POSIX and dt time of writing macOS is known to be flaky
in that regard.

This test causes false test failures.

Author: matthiasblaesing

test/com/sun/jna/NativeLibraryTest.java

@@ -82,16 +82,22 @@ public void testGCNativeLibrary() throws Exception {
     }
 
     public void testAvoidDuplicateLoads() throws Exception {
-        NativeLibrary.disposeAll();
-        // Give the system a moment to unload the library; on OSX we
-        // occasionally get the same library handle back on subsequent dlopen
-        Thread.sleep(2);
-
-        TestLibrary lib = Native.load("testlib", TestLibrary.class);
-        assertEquals("Library should be newly loaded after explicit dispose of all native libraries",
-                     1, lib.callCount());
-        if (lib.callCount() <= 1) {
-            fail("Library should not be reloaded without dispose");
+        // This test basicly tests whether unloading works. It relies on the
+        // runtime to unload the library when dlclose is called. This is not
+        // required by POSIX and dt time of writing macOS is known to be flaky
+        // in that regard.
+        //
+        // This test causes false test failures
+        if (!Platform.isMac()) {
+            NativeLibrary.disposeAll();
+            Thread.sleep(2);
+
+            TestLibrary lib = Native.load("testlib", TestLibrary.class);
+            assertEquals("Library should be newly loaded after explicit dispose of all native libraries",
+                    1, lib.callCount());
+            if (lib.callCount() <= 1) {
+                fail("Library should not be reloaded without dispose");
+            }
         }
     }