Ensure tests pass when sun.misc.Unsafe is not present

Motivation:

We need to ensure we pass all tests when sun.misc.Unsafe is not present.

Modifications:

- Make *ByteBufAllocatorTest work whenever sun.misc.Unsafe is present or not

Result:

Tests pass even without sun.misc.Unsafe.

buffer/src/test/java/io/netty/buffer/AbstractByteBufAllocatorTest.java

@@ -15,11 +15,18 @@
  */
 package io.netty.buffer;
 
+import io.netty.util.internal.PlatformDependent;
+
 public abstract class AbstractByteBufAllocatorTest extends ByteBufAllocatorTest {
 
     @Override
     protected abstract AbstractByteBufAllocator newAllocator(boolean preferDirect);
 
+    @Override
+    protected boolean isDirectExpected(boolean preferDirect) {
+        return preferDirect && PlatformDependent.hasUnsafe();
+    }
+
     @Override
     protected final int defaultMaxCapacity() {
         return AbstractByteBufAllocator.DEFAULT_MAX_CAPACITY;

buffer/src/test/java/io/netty/buffer/ByteBufAllocatorTest.java

@@ -37,7 +37,7 @@ public abstract class ByteBufAllocatorTest {
         ByteBufAllocator allocator = newAllocator(preferDirect);
         ByteBuf buffer = allocator.buffer(1);
         try {
-            assertBuffer(buffer, preferDirect, 1, defaultMaxCapacity());
+            assertBuffer(buffer, isDirectExpected(preferDirect), 1, defaultMaxCapacity());
         } finally {
             buffer.release();
         }
@@ -53,12 +53,14 @@ public abstract class ByteBufAllocatorTest {
         ByteBufAllocator allocator = newAllocator(preferDirect);
         ByteBuf buffer = allocator.buffer(1, maxCapacity);
         try {
-            assertBuffer(buffer, preferDirect, 1, maxCapacity);
+            assertBuffer(buffer, isDirectExpected(preferDirect), 1, maxCapacity);
         } finally {
             buffer.release();
         }
     }
 
+    protected abstract boolean isDirectExpected(boolean preferDirect);
+
     @Test
     public void testHeapBuffer() {
         testHeapBuffer(true);