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diff --git a/mojo/public/c/system/tests/macros_unittest.cc b/mojo/public/c/system/tests/macros_unittest.cc
new file mode 100644
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+++ b/mojo/public/c/system/tests/macros_unittest.cc
@@ -0,0 +1,68 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file tests the C Mojo system macros and consists of "positive" tests,
+// i.e., those verifying that things work (without compile errors, or even
+// warnings if warnings are treated as errors).
+// TODO(vtl): Fix no-compile tests (which are all disabled; crbug.com/105388)
+// and write some "negative" tests.
+
+#include "mojo/public/c/system/macros.h"
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace {
+
+// First test |MOJO_STATIC_ASSERT()| in a global scope.
+MOJO_STATIC_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t),
+                   "Bad static_assert() failure in global scope");
+
+TEST(MacrosTest, CompileAssert) {
+  // Then in a local scope.
+  MOJO_STATIC_ASSERT(sizeof(int32_t) == 2 * sizeof(int16_t),
+                     "Bad static_assert() failure");
+}
+
+TEST(MacrosTest, Alignof) {
+  // Strictly speaking, this isn't a portable test, but I think it'll pass on
+  // all the platforms we currently support.
+  EXPECT_EQ(1u, MOJO_ALIGNOF(char));
+  EXPECT_EQ(4u, MOJO_ALIGNOF(int32_t));
+  EXPECT_EQ(8u, MOJO_ALIGNOF(int64_t));
+  EXPECT_EQ(8u, MOJO_ALIGNOF(double));
+}
+
+// These structs are used in the Alignas test. Define them globally to avoid
+// MSVS warnings/errors.
+#if defined(_MSC_VER)
+#pragma warning(push)
+// Disable the warning "structure was padded due to __declspec(align())".
+#pragma warning(disable : 4324)
+#endif
+struct MOJO_ALIGNAS(1) StructAlignas1 {
+  char x;
+};
+struct MOJO_ALIGNAS(4) StructAlignas4 {
+  char x;
+};
+struct MOJO_ALIGNAS(8) StructAlignas8 {
+  char x;
+};
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+TEST(MacrosTest, Alignas) {
+  EXPECT_EQ(1u, MOJO_ALIGNOF(StructAlignas1));
+  EXPECT_EQ(4u, MOJO_ALIGNOF(StructAlignas4));
+  EXPECT_EQ(8u, MOJO_ALIGNOF(StructAlignas8));
+}
+
+}  // namespace
+}  // namespace mojo