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diff --git a/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp b/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp
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+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <wtf/Ref.h>
+#include <wtf/RefCounter.h>
+#include <wtf/text/WTFString.h>
+
+namespace TestWebKitAPI {
+
+static const int IncrementExpected = 0xC0FFEE1;
+static const int DecrementExpected = 0xC0FFEE2;
+static const int CallbackNotExpected = 0xDECAF;
+
+enum TestCounterType { };
+typedef RefCounter<TestCounterType> TestCounter;
+typedef TestCounter::Token TokenType;
+
+TEST(WTF, RefCounter)
+{
+    // RefCounter API is pretty simple, containing the following 4 methods to test:
+    //
+    // 1) RefCounter(std::function<void()>);
+    // 2) ~RefCounter();
+    // 3) Ref<Count> token() const;
+    // 4) unsigned value() const;
+    //
+    // We'll test:
+    // 1) Construction:
+    //   1a) with a callback
+    //   1b) without a callback
+    // 2) Destruction where the RefCounter::Count has:
+    //   2a) a non-zero reference count (Count outlives RefCounter).
+    //   2b) a zero reference count (Count is deleted by RefCounter's destructor).
+    // 3) Call count to ref/deref the Count object, where:
+    //   3a) ref with callback from 0 -> 1.
+    //   3b) ref with callback from 1 -> >1.
+    //   3c) deref with callback from >1 -> 1.
+    //   3d) deref with callback from 1 -> 0.
+    //   3d) deref with callback from 1 -> 0.
+    //   3e) ref with callback from 1 -> >1 AFTER RefCounter has been destroyed.
+    //   3f) deref with callback from >1 -> 1 AFTER RefCounter has been destroyed.
+    //   3g) deref with callback from 1 -> 0 AFTER RefCounter has been destroyed.
+    //   3h) ref without callback
+    //   3i) deref without callback
+    //   3j) ref using a Ref rather than a RefPtr (make sure there is no unnecessary reference count churn).
+    //   3k) deref using a Ref rather than a RefPtr (make sure there is no unnecessary reference count churn).
+    // 4) Test the value of the counter:
+    //   4a) at construction.
+    //   4b) as read within the callback.
+    //   4c) as read after the ref/deref.
+
+    // These values will outlive the following block.
+    int callbackValue = CallbackNotExpected;
+    TokenType incTo1Again;
+
+    {
+        // Testing (1a) - Construction with a callback.
+        TestCounter* counterPtr = nullptr;
+        TestCounter counter([&](RefCounterEvent event) {
+            // Check that the callback is called at the expected times, and the correct number of times.
+            if (RefCounterEvent::Increment == event)
+                EXPECT_EQ(callbackValue, IncrementExpected);
+            if (RefCounterEvent::Decrement == event)
+                EXPECT_EQ(callbackValue, DecrementExpected);
+            // return the value of the counter in the callback.
+            callbackValue = counterPtr->value();
+        });
+        counterPtr = &counter;
+        // Testing (4a) - after construction value() is 0.
+        EXPECT_EQ(0, static_cast<int>(counter.value()));
+
+        // Testing (3a) - ref with callback from 0 -> 1.
+        callbackValue = IncrementExpected;
+        TokenType incTo1(counter.count());
+        // Testing (4b) & (4c) - values within & after callback.
+        EXPECT_EQ(1, callbackValue);
+        EXPECT_EQ(1, static_cast<int>(counter.value()));
+
+        // Testing (3b) - ref with callback from 1 -> 2.
+        callbackValue = IncrementExpected;
+        TokenType incTo2(incTo1);
+        // Testing (4b) & (4c) - values within & after callback.
+        EXPECT_EQ(2, callbackValue);
+        EXPECT_EQ(2, static_cast<int>(counter.value()));
+
+        // Testing (3c) - deref with callback from >1 -> 1.
+        callbackValue = DecrementExpected;
+        incTo1 = nullptr;
+        // Testing (4b) & (4c) - values within & after callback.
+        EXPECT_EQ(1, callbackValue);
+        EXPECT_EQ(1, static_cast<int>(counter.value()));
+
+        {
+            // Testing (3j) - ref using a Ref rather than a RefPtr.
+            callbackValue = IncrementExpected;
+            TokenType incTo2Again(counter.count());
+            // Testing (4b) & (4c) - values within & after callback.
+            EXPECT_EQ(2, callbackValue);
+            EXPECT_EQ(2, static_cast<int>(counter.value()));
+            // Testing (3k) - deref using a Ref rather than a RefPtr.
+
+            callbackValue = DecrementExpected;
+        }
+        EXPECT_EQ(1, callbackValue);
+        EXPECT_EQ(1, static_cast<int>(counter.value()));
+        // Testing (4b) & (4c) - values within & after callback.
+
+        // Testing (3d) - deref with callback from 1 -> 0.
+        callbackValue = DecrementExpected;
+        incTo2 = nullptr;
+        // Testing (4b) & (4c) - values within & after callback.
+        EXPECT_EQ(0, callbackValue);
+        EXPECT_EQ(0, static_cast<int>(counter.value()));
+
+        // Testing (2a) - Destruction where the TestCounter::Count has a non-zero reference count.
+        callbackValue = IncrementExpected;
+        incTo1Again = counter.count();
+        EXPECT_EQ(1, callbackValue);
+        EXPECT_EQ(1, static_cast<int>(counter.value()));
+        callbackValue = CallbackNotExpected;
+    }
+
+    // Testing (3e) - ref with callback from 1 -> >1 AFTER RefCounter has been destroyed.
+    TokenType incTo2Again = incTo1Again;
+    // Testing (3f) - deref with callback from >1 -> 1 AFTER RefCounter has been destroyed.
+    incTo1Again = nullptr;
+    // Testing (3g) - deref with callback from 1 -> 0 AFTER RefCounter has been destroyed.
+    incTo2Again = nullptr;
+
+    // Testing (1b) - Construction without a callback.
+    TestCounter counter;
+    // Testing (4a) - after construction value() is 0.
+    EXPECT_EQ(0, static_cast<int>(counter.value()));
+    // Testing (3h) - ref without callback
+    TokenType incTo1(counter.count());
+    // Testing (4c) - value as read after the ref.
+    EXPECT_EQ(1, static_cast<int>(counter.value()));
+    // Testing (3i) - deref without callback
+    incTo1 = nullptr;
+    // Testing (4c) - value as read after the deref.
+    EXPECT_EQ(0, static_cast<int>(counter.value()));
+    // Testing (2b) - Destruction where the RefCounter::Count has a zero reference count.
+    // ... not a lot to test here! - we can at least ensure this code path is run & we don't crash!
+}
+
+} // namespace TestWebKitAPI