ARROW-85. Added tests for Buffer and the new behavior

cpp/src/arrow/util/buffer-test.cc

@@ -53,4 +53,40 @@ TEST_F(TestBuffer, ResizeOOM) {
  ASSERT_RAISES(OutOfMemory, buf.Resize(to_alloc));
 }
 
+TEST_F(TestBuffer, EqualsWithSameContent) {
+ MemoryPool* pool = default_memory_pool();
+ int32_t bufferSize = 128 * 1024;
+ uint8_t* rawBuffer1 = NULL;
+ ASSERT_OK(pool->Allocate(bufferSize, &rawBuffer1));
+ memset(rawBuffer1, 12, bufferSize);
+ uint8_t* rawBuffer2 = NULL;
+ ASSERT_OK(pool->Allocate(bufferSize, &rawBuffer2));
+ memset(rawBuffer2, 12, bufferSize);
+ uint8_t* rawBuffer3 = NULL;
+ ASSERT_OK(pool->Allocate(bufferSize, &rawBuffer3));
+ memset(rawBuffer3, 3, bufferSize);
+
+ Buffer buffer1(rawBuffer1, bufferSize);
+ Buffer buffer2(rawBuffer2, bufferSize);
+ Buffer buffer3(rawBuffer3, bufferSize);
+ ASSERT_TRUE(buffer1.Equals(buffer2));
+ ASSERT_FALSE(buffer1.Equals(buffer3));
+}
+
+TEST_F(TestBuffer, EqualsWithSameBuffer) {
+ MemoryPool* pool = default_memory_pool();
+ int32_t bufferSize = 128 * 1024;
+ uint8_t* rawBuffer = NULL;
+ ASSERT_OK(pool->Allocate(bufferSize, &rawBuffer));
+
+ Buffer buffer1(rawBuffer, bufferSize);
+ Buffer buffer2(rawBuffer, bufferSize);
+ ASSERT_TRUE(buffer1.Equals(buffer2));
+
+ int64_t nbytes = bufferSize / 2;
+ Buffer buffer3(rawBuffer, nbytes); 
+ ASSERT_TRUE(buffer1.Equals(buffer3, nbytes));
+ ASSERT_FALSE(buffer1.Equals(buffer3, nbytes + 1));
+}
+
 } // namespace arrow