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diff --git a/src/rapidjson/test/unittest/allocatorstest.cpp b/src/rapidjson/test/unittest/allocatorstest.cpp
new file mode 100644
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+++ b/src/rapidjson/test/unittest/allocatorstest.cpp
@@ -0,0 +1,102 @@
+// Tencent is pleased to support the open source community by making RapidJSON available.
+// 
+// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
+//
+// Licensed under the MIT License (the "License"); you may not use this file except
+// in compliance with the License. You may obtain a copy of the License at
+//
+// http://opensource.org/licenses/MIT
+//
+// Unless required by applicable law or agreed to in writing, software distributed 
+// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
+// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
+// specific language governing permissions and limitations under the License.
+
+#include "unittest.h"
+
+#include "rapidjson/allocators.h"
+
+using namespace rapidjson;
+
+template <typename Allocator>
+void TestAllocator(Allocator& a) {
+    EXPECT_TRUE(a.Malloc(0) == 0);
+
+    uint8_t* p = static_cast<uint8_t*>(a.Malloc(100));
+    EXPECT_TRUE(p != 0);
+    for (size_t i = 0; i < 100; i++)
+        p[i] = static_cast<uint8_t>(i);
+
+    // Expand
+    uint8_t* q = static_cast<uint8_t*>(a.Realloc(p, 100, 200));
+    EXPECT_TRUE(q != 0);
+    for (size_t i = 0; i < 100; i++)
+        EXPECT_EQ(i, q[i]);
+    for (size_t i = 100; i < 200; i++)
+        q[i] = static_cast<uint8_t>(i);
+
+    // Shrink
+    uint8_t *r = static_cast<uint8_t*>(a.Realloc(q, 200, 150));
+    EXPECT_TRUE(r != 0);
+    for (size_t i = 0; i < 150; i++)
+        EXPECT_EQ(i, r[i]);
+
+    Allocator::Free(r);
+
+    // Realloc to zero size
+    EXPECT_TRUE(a.Realloc(a.Malloc(1), 1, 0) == 0);
+}
+
+TEST(Allocator, CrtAllocator) {
+    CrtAllocator a;
+    TestAllocator(a);
+}
+
+TEST(Allocator, MemoryPoolAllocator) {
+    MemoryPoolAllocator<> a;
+    TestAllocator(a);
+
+    for (size_t i = 1; i < 1000; i++) {
+        EXPECT_TRUE(a.Malloc(i) != 0);
+        EXPECT_LE(a.Size(), a.Capacity());
+    }
+}
+
+TEST(Allocator, Alignment) {
+#if RAPIDJSON_64BIT == 1
+    EXPECT_EQ(RAPIDJSON_UINT64_C2(0x00000000, 0x00000000), RAPIDJSON_ALIGN(0));
+    for (uint64_t i = 1; i < 8; i++) {
+        EXPECT_EQ(RAPIDJSON_UINT64_C2(0x00000000, 0x00000008), RAPIDJSON_ALIGN(i));
+        EXPECT_EQ(RAPIDJSON_UINT64_C2(0x00000000, 0x00000010), RAPIDJSON_ALIGN(RAPIDJSON_UINT64_C2(0x00000000, 0x00000008) + i));
+        EXPECT_EQ(RAPIDJSON_UINT64_C2(0x00000001, 0x00000000), RAPIDJSON_ALIGN(RAPIDJSON_UINT64_C2(0x00000000, 0xFFFFFFF8) + i));
+        EXPECT_EQ(RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFF8), RAPIDJSON_ALIGN(RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFF0) + i));
+    }
+#else
+    EXPECT_EQ(0u, RAPIDJSON_ALIGN(0u));
+    for (uint32_t i = 1; i < 4; i++) {
+        EXPECT_EQ(4u, RAPIDJSON_ALIGN(i));
+        EXPECT_EQ(8u, RAPIDJSON_ALIGN(4u + i));
+        EXPECT_EQ(0xFFFFFFF8u, RAPIDJSON_ALIGN(0xFFFFFFF4u + i));
+        EXPECT_EQ(0xFFFFFFFCu, RAPIDJSON_ALIGN(0xFFFFFFF8u + i));
+    }
+#endif
+}
+
+TEST(Allocator, Issue399) {
+    MemoryPoolAllocator<> a;
+    void* p = a.Malloc(100);
+    void* q = a.Realloc(p, 100, 200);
+    EXPECT_EQ(p, q);
+
+    // exhuasive testing
+    for (size_t j = 1; j < 32; j++) {
+        a.Clear();
+        a.Malloc(j); // some unaligned size
+        p = a.Malloc(1);
+        for (size_t i = 1; i < 1024; i++) {
+            q = a.Realloc(p, i, i + 1);
+            EXPECT_EQ(p, q);
+            p = q;
+        }
+    }
+}