1 files changed, 45 insertions, 0 deletions
diff --git a/absl/base/config_test.cc b/absl/base/config_test.cc
new file mode 100644
index 000000000000..578bb810b214
--- /dev/null
+++ b/absl/base/config_test.cc
@@ -0,0 +1,45 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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 "absl/base/config.h"
+
+#include <cstdint>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(ConfigTest, Endianness) {
+  union
+  {
+    uint32_t value;
+    uint8_t data[sizeof(uint32_t)];
+  } number;
+  number.data[0] = 0x00;
+  number.data[1] = 0x01;
+  number.data[2] = 0x02;
+  number.data[3] = 0x03;
+#if defined(ABSL_IS_LITTLE_ENDIAN) && defined(ABSL_IS_BIG_ENDIAN)
+#error Both ABSL_IS_LITTLE_ENDIAN and ABSL_IS_BIG_ENDIAN are defined
+#elif defined(ABSL_IS_LITTLE_ENDIAN)
+  EXPECT_EQ(UINT32_C(0x03020100), number.value);
+#elif defined(ABSL_IS_BIG_ENDIAN)
+  EXPECT_EQ(UINT32_C(0x00010203), number.value);
+#else
+#error Unknown endianness
+#endif
+}
+
+}  // namespace