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diff --git a/Tools/TestWebKitAPI/Tests/WebCore/DFAMinimizer.cpp b/Tools/TestWebKitAPI/Tests/WebCore/DFAMinimizer.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebCore/DFAMinimizer.cpp
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2015 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 "DFAHelpers.h"
+#include <wtf/MainThread.h>
+
+namespace TestWebKitAPI {
+
+class DFAMinimizerTest : public testing::Test {
+public:
+    virtual void SetUp()
+    {
+        WTF::initializeMainThread();
+    }
+};
+
+TEST_F(DFAMinimizerTest, BasicSearch)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ ".*foo", ".*bar", ".*bang"});
+    EXPECT_EQ(static_cast<size_t>(8), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(7), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, MergeSuffixes)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ ".*aaa", ".*aab", ".*aba", ".*abb", ".*baa", ".*bab", ".*bba", ".*bbb"});
+    EXPECT_EQ(static_cast<size_t>(12), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(4), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, MergeInfixes)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ ".*aaakit", ".*aabkit", ".*abakit", ".*abbkit", ".*baakit", ".*babkit", ".*bbakit", ".*bbbkit"});
+    EXPECT_EQ(static_cast<size_t>(15), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(7), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, FallbackTransitionsWithDifferentiatorDoNotMerge1)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^a.a", "^b.a", "^bac", "^bbc", "^BCC"});
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, FallbackTransitionsWithDifferentiatorDoNotMerge2)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^bbc", "^BCC", "^a.a", "^b.a"});
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, FallbackTransitionsWithDifferentiatorDoNotMerge3)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^a.c", "^b.c", "^baa", "^bba", "^BCA"});
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, FallbackTransitionsWithDifferentiatorDoNotMerge4)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^baa", "^bba", "^BCA", "^a.c", "^b.c"});
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, FallbackTransitionsToOtherNodeInSameGroupDoesNotDifferentiateGroup)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^aac", "^a.c", "^b.c"});
+    EXPECT_EQ(static_cast<size_t>(5), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(4), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, SimpleFallBackTransitionDifferentiator1)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^a.bc.de", "^a.bd.ef"});
+    EXPECT_EQ(static_cast<size_t>(11), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(11), countLiveNodes(dfa));
+}
+
+TEST_F(DFAMinimizerTest, SimpleFallBackTransitionDifferentiator2)
+{
+    ContentExtensions::DFA dfa = buildDFAFromPatterns({ "^cb.", "^db.b"});
+    EXPECT_EQ(static_cast<size_t>(7), countLiveNodes(dfa));
+    dfa.minimize();
+    EXPECT_EQ(static_cast<size_t>(7), countLiveNodes(dfa));
+}
+
+} // namespace TestWebKitAPI