1 files changed, 133 insertions, 0 deletions
diff --git a/src/rapidjson/test/unittest/bigintegertest.cpp b/src/rapidjson/test/unittest/bigintegertest.cpp
new file mode 100644
index 000000000..a68e14446
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+++ b/src/rapidjson/test/unittest/bigintegertest.cpp
@@ -0,0 +1,133 @@
+// 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/internal/biginteger.h"
+
+using namespace rapidjson::internal;
+
+#define BIGINTEGER_LITERAL(s) BigInteger(s, sizeof(s) - 1)
+
+static const BigInteger kZero(0);
+static const BigInteger kOne(1);
+static const BigInteger kUint64Max = BIGINTEGER_LITERAL("18446744073709551615");
+static const BigInteger kTwo64 = BIGINTEGER_LITERAL("18446744073709551616");
+
+TEST(BigInteger, Constructor) {
+    EXPECT_TRUE(kZero.IsZero());
+    EXPECT_TRUE(kZero == kZero);
+    EXPECT_TRUE(kZero == BIGINTEGER_LITERAL("0"));
+    EXPECT_TRUE(kZero == BIGINTEGER_LITERAL("00"));
+
+    const BigInteger a(123);
+    EXPECT_TRUE(a == a);
+    EXPECT_TRUE(a == BIGINTEGER_LITERAL("123"));
+    EXPECT_TRUE(a == BIGINTEGER_LITERAL("0123"));
+
+    EXPECT_EQ(2u, kTwo64.GetCount());
+    EXPECT_EQ(0u, kTwo64.GetDigit(0));
+    EXPECT_EQ(1u, kTwo64.GetDigit(1));
+}
+
+TEST(BigInteger, AddUint64) {
+    BigInteger a = kZero;
+    a += 0u;
+    EXPECT_TRUE(kZero == a);
+
+    a += 1u;
+    EXPECT_TRUE(kOne == a);
+
+    a += 1u;
+    EXPECT_TRUE(BigInteger(2) == a);
+
+    EXPECT_TRUE(BigInteger(RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFFF)) == kUint64Max);
+    BigInteger b = kUint64Max;
+    b += 1u;
+    EXPECT_TRUE(kTwo64 == b);
+    b += RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFFF);
+    EXPECT_TRUE(BIGINTEGER_LITERAL("36893488147419103231") == b);
+}
+
+TEST(BigInteger, MultiplyUint64) {
+    BigInteger a = kZero;
+    a *= static_cast <uint64_t>(0);
+    EXPECT_TRUE(kZero == a);
+    a *= static_cast <uint64_t>(123);
+    EXPECT_TRUE(kZero == a);
+
+    BigInteger b = kOne;
+    b *= static_cast<uint64_t>(1);
+    EXPECT_TRUE(kOne == b);
+    b *= static_cast<uint64_t>(0);
+    EXPECT_TRUE(kZero == b);
+
+    BigInteger c(123);
+    c *= static_cast<uint64_t>(456u);
+    EXPECT_TRUE(BigInteger(123u * 456u) == c);
+    c *= RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFFF);
+    EXPECT_TRUE(BIGINTEGER_LITERAL("1034640981606221330982120") == c);
+    c *= RAPIDJSON_UINT64_C2(0xFFFFFFFF, 0xFFFFFFFF);
+    EXPECT_TRUE(BIGINTEGER_LITERAL("19085757395861596536664473018420572782123800") == c);
+}
+
+TEST(BigInteger, MultiplyUint32) {
+    BigInteger a = kZero;
+    a *= static_cast <uint32_t>(0);
+    EXPECT_TRUE(kZero == a);
+    a *= static_cast <uint32_t>(123);
+    EXPECT_TRUE(kZero == a);
+
+    BigInteger b = kOne;
+    b *= static_cast<uint32_t>(1);
+    EXPECT_TRUE(kOne == b);
+    b *= static_cast<uint32_t>(0);
+    EXPECT_TRUE(kZero == b);
+
+    BigInteger c(123);
+    c *= static_cast<uint32_t>(456u);
+    EXPECT_TRUE(BigInteger(123u * 456u) == c);
+    c *= 0xFFFFFFFFu;
+    EXPECT_TRUE(BIGINTEGER_LITERAL("240896125641960") == c);
+    c *= 0xFFFFFFFFu;
+    EXPECT_TRUE(BIGINTEGER_LITERAL("1034640981124429079698200") == c);
+}
+
+TEST(BigInteger, LeftShift) {
+    BigInteger a = kZero;
+    a <<= 1;
+    EXPECT_TRUE(kZero == a);
+    a <<= 64;
+    EXPECT_TRUE(kZero == a);
+
+    a = BigInteger(123);
+    a <<= 0;
+    EXPECT_TRUE(BigInteger(123) == a);
+    a <<= 1;
+    EXPECT_TRUE(BigInteger(246) == a);
+    a <<= 64;
+    EXPECT_TRUE(BIGINTEGER_LITERAL("4537899042132549697536") == a);
+    a <<= 99;
+    EXPECT_TRUE(BIGINTEGER_LITERAL("2876235222267216943024851750785644982682875244576768") == a);
+}
+
+TEST(BigInteger, Compare) {
+    EXPECT_EQ(0, kZero.Compare(kZero));
+    EXPECT_EQ(1, kOne.Compare(kZero));
+    EXPECT_EQ(-1, kZero.Compare(kOne));
+    EXPECT_EQ(0, kUint64Max.Compare(kUint64Max));
+    EXPECT_EQ(0, kTwo64.Compare(kTwo64));
+    EXPECT_EQ(-1, kUint64Max.Compare(kTwo64));
+    EXPECT_EQ(1, kTwo64.Compare(kUint64Max));
+}