Add empty string test case for ostream << CFX_ByteString.

Change-Id: I1f3933709ad4a4f251a634dbe6d87a541994f02e
Reviewed-on: https://pdfium-review.googlesource.com/7037
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/core/fxcrt/cfx_bytestring_unittest.cpp b/core/fxcrt/cfx_bytestring_unittest.cpp
index 86fa3830c2..b0265038d5 100644
--- a/core/fxcrt/cfx_bytestring_unittest.cpp
+++ b/core/fxcrt/cfx_bytestring_unittest.cpp
@@ -1261,9 +1261,16 @@ TEST(fxcrt, EqualNoCase) {
 }
 
 TEST(fxcrt, OStreamByteStringOverload) {
-  // Basic case
   std::ostringstream stream;
-  CFX_ByteString str("def");
+
+  // Basic case, empty string
+  CFX_ByteString str;
+  stream << str;
+  EXPECT_EQ("", stream.str());
+
+  // Basic case, non-empty string
+  str = "def";
+  stream.str("");
   stream << "abc" << str << "ghi";
   EXPECT_EQ("abcdefghi", stream.str());