Make BinaryRef output correctly in case of empty data.

Previously, it would simply output nothing, but it should output an
empty string `""`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185894 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 62 insertions, 0 deletions

diff --git a/unittests/Object/CMakeLists.txt b/unittests/Object/CMakeLists.txt
new file mode 100644
index 0000000..b491dd7
--- /dev/null
+++ b/unittests/Object/CMakeLists.txt
@@ -0,0 +1,7 @@
+set(LLVM_LINK_COMPONENTS
+  object
+  )
+
+add_llvm_unittest(ObjectTests
+  YAMLTest.cpp
+  )
diff --git a/unittests/Object/Makefile b/unittests/Object/Makefile
new file mode 100644
index 0000000..0788a62
--- /dev/null
+++ b/unittests/Object/Makefile
@@ -0,0 +1,15 @@
+##===- unittests/IR/Makefile -------------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+TESTNAME = Object
+LINK_COMPONENTS := object
+
+include $(LEVEL)/Makefile.config
+include $(LLVM_SRC_ROOT)/unittests/Makefile.unittest
diff --git a/unittests/Object/YAMLTest.cpp b/unittests/Object/YAMLTest.cpp
new file mode 100644
index 0000000..3428e94
--- /dev/null
+++ b/unittests/Object/YAMLTest.cpp
@@ -0,0 +1,40 @@
+//===- llvm/unittest/Object/YAMLTest.cpp - Tests for Object YAML ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/YAML.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+struct BinaryHolder {
+  object::yaml::BinaryRef Binary;
+};
+} // end anonymous namespace
+
+namespace llvm {
+namespace yaml {
+template <>
+struct MappingTraits<BinaryHolder> {
+  static void mapping(IO &IO, BinaryHolder &BH) {
+    IO.mapRequired("Binary", BH.Binary);
+  }
+};
+} // end namespace yaml
+} // end namespace llvm
+
+TEST(ObjectYAML, BinaryRef) {
+  BinaryHolder BH;
+  SmallVector<char, 32> Buf;
+  llvm::raw_svector_ostream OS(Buf);
+  yaml::Output YOut(OS);
+  YOut << BH;
+  EXPECT_NE(OS.str().find("\"\""), StringRef::npos);
+}