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diff --git a/Tools/TestWebKitAPI/Tests/WebCore/DFACombiner.cpp b/Tools/TestWebKitAPI/Tests/WebCore/DFACombiner.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebCore/DFACombiner.cpp
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+/*
+ * 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 <WebCore/DFACombiner.h>
+#include <wtf/MainThread.h>
+
+using namespace WebCore;
+using namespace ContentExtensions;
+
+namespace TestWebKitAPI {
+
+class DFACombinerTest : public testing::Test {
+public:
+    virtual void SetUp()
+    {
+        WTF::initializeMainThread();
+    }
+};
+
+Vector<DFA> combine(Vector<DFA> dfas, unsigned minimumSize)
+{
+    DFACombiner combiner;
+    for (DFA& dfa : dfas)
+        combiner.addDFA(WTFMove(dfa));
+
+    Vector<DFA> output;
+    combiner.combineDFAs(minimumSize, [&output](DFA&& dfa) {
+        output.append(dfa);
+    });
+    return output;
+}
+
+TEST_F(DFACombinerTest, Basic)
+{
+    Vector<DFA> dfas = { buildDFAFromPatterns({ "foo"}), buildDFAFromPatterns({ "bar"}) };
+    Vector<DFA> combinedDFAs = combine(dfas, 10000);
+    EXPECT_EQ(static_cast<size_t>(1), combinedDFAs.size());
+
+    DFA reference = buildDFAFromPatterns({ "foo", "bar"});
+    reference.minimize();
+    EXPECT_EQ(countLiveNodes(reference), countLiveNodes(combinedDFAs.first()));
+}
+
+
+TEST_F(DFACombinerTest, IdenticalDFAs)
+{
+    Vector<DFA> dfas = { buildDFAFromPatterns({ "foo"}), buildDFAFromPatterns({ "foo"}) };
+    Vector<DFA> combinedDFAs = combine(dfas, 10000);
+    EXPECT_EQ(static_cast<size_t>(1), combinedDFAs.size());
+
+    // The result should have the exact same size as the minimized input.
+    DFA reference = buildDFAFromPatterns({ "foo"});
+    reference.minimize();
+    EXPECT_EQ(countLiveNodes(reference), countLiveNodes(combinedDFAs.first()));
+}
+
+TEST_F(DFACombinerTest, NoInput)
+{
+    DFACombiner combiner;
+    unsigned counter = 0;
+    combiner.combineDFAs(100000, [&counter](DFA&& dfa) {
+        ++counter;
+    });
+    EXPECT_EQ(static_cast<unsigned>(0), counter);
+}
+
+TEST_F(DFACombinerTest, SingleInput)
+{
+    Vector<DFA> dfas = { buildDFAFromPatterns({ "WebKit"}) };
+    Vector<DFA> combinedDFAs = combine(dfas, 10000);
+    EXPECT_EQ(static_cast<size_t>(1), combinedDFAs.size());
+
+    DFA reference = buildDFAFromPatterns({ "WebKit"});
+    reference.minimize();
+    EXPECT_EQ(countLiveNodes(reference), countLiveNodes(combinedDFAs.first()));
+}
+
+TEST_F(DFACombinerTest, InputTooLargeForMinimumSize)
+{
+    Vector<DFA> dfas = { buildDFAFromPatterns({ "foo"}), buildDFAFromPatterns({ "bar"}) };
+    Vector<DFA> combinedDFAs = combine(dfas, 2);
+    EXPECT_EQ(static_cast<size_t>(2), combinedDFAs.size());
+    EXPECT_EQ(static_cast<size_t>(4), countLiveNodes(combinedDFAs[0]));
+    EXPECT_EQ(static_cast<size_t>(4), countLiveNodes(combinedDFAs[1]));
+}
+
+TEST_F(DFACombinerTest, CombinedInputReachesMinimumSize)
+{
+    Vector<DFA> dfas = { buildDFAFromPatterns({ "foo"}), buildDFAFromPatterns({ "bar"}), buildDFAFromPatterns({ "WebKit"}) };
+    Vector<DFA> combinedDFAs = combine(dfas, 5);
+    EXPECT_EQ(static_cast<size_t>(2), combinedDFAs.size());
+    EXPECT_EQ(static_cast<size_t>(7), countLiveNodes(combinedDFAs[0]));
+    EXPECT_EQ(static_cast<size_t>(6), countLiveNodes(combinedDFAs[1]));
+}
+
+} // namespace TestWebKitAPI