rocksdb: print status error message when (ASSERT|EXPECT)_OK fails

Summary: Modified rocksdb status assertions ASSERT_OK and EXPECT_OK to print error message from Status::ToString() when failed.

Test Plan: Modify a test to fail status assertions ASSERT_OK and EXPECT_OK and notice an error message that came from Status::ToString()

Reviewers: meyering, sdong, yhchiang, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D35469

util/testharness.cc

@@ -13,6 +13,15 @@
 namespace rocksdb {
 namespace test {
 
+::testing::AssertionResult AssertStatus(const char* s_expr, const Status& s) {
+  if (s.ok()) {
+    return ::testing::AssertionSuccess();
+  } else {
+    return ::testing::AssertionFailure() << s_expr << std::endl
+                                         << s.ToString();
+  }
+}
+
 std::string TmpDir(Env* env) {
   std::string dir;
   Status s = env->GetTestDirectory(&dir);

util/testharness.h

@@ -25,10 +25,12 @@ std::string TmpDir(Env* env = Env::Default());
 // runs may be able to vary the seed.
 int RandomSeed();
 
-#define ASSERT_OK(s) ASSERT_TRUE(((s).ok()))
-#define ASSERT_NOK(s) ASSERT_FALSE(((s).ok()))
-#define EXPECT_OK(s) EXPECT_TRUE(((s).ok()))
-#define EXPECT_NOK(s) EXPECT_FALSE(((s).ok()))
+::testing::AssertionResult AssertStatus(const char* s_expr, const Status& s);
+
+#define ASSERT_OK(s) ASSERT_PRED_FORMAT1(rocksdb::test::AssertStatus, s)
+#define ASSERT_NOK(s) ASSERT_FALSE((s).ok())
+#define EXPECT_OK(s) EXPECT_PRED_FORMAT1(rocksdb::test::AssertStatus, s)
+#define EXPECT_NOK(s) EXPECT_FALSE((s).ok())
 
 }  // namespace test
 }  // namespace rocksdb