Merge to XFA: Add more fxcrt string sanity tests.

Sadly I've gotten these to fail with Chromium debug builds.

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1447163004 .

(cherry picked from commit 191333dbc8889a60ff43a10176cc0ae87dc11d89)

Review URL: https://codereview.chromium.org/1453403002 .

2 files changed, 16 insertions, 0 deletions

diff --git a/core/src/fxcrt/fx_basic_bstring_unittest.cpp b/core/src/fxcrt/fx_basic_bstring_unittest.cpp
index 614206bb60..337775d9af 100644
--- a/core/src/fxcrt/fx_basic_bstring_unittest.cpp
+++ b/core/src/fxcrt/fx_basic_bstring_unittest.cpp
@@ -679,3 +679,11 @@ TEST(fxcrt, ByteStringFormatPrecision) {
     EXPECT_EQ("Bad precision", str);
   }
 }
+
+TEST(fxcrt, EmptyByteString) {
+  CFX_ByteString empty_str;
+  EXPECT_TRUE(empty_str.IsEmpty());
+  EXPECT_EQ(0, empty_str.GetLength());
+  const FX_CHAR* cstr = empty_str.c_str();
+  EXPECT_EQ(0, FXSYS_strlen(cstr));
+}
diff --git a/core/src/fxcrt/fx_basic_wstring_unittest.cpp b/core/src/fxcrt/fx_basic_wstring_unittest.cpp
index 8ce778920f..74410ddda3 100644
--- a/core/src/fxcrt/fx_basic_wstring_unittest.cpp
+++ b/core/src/fxcrt/fx_basic_wstring_unittest.cpp
@@ -516,3 +516,11 @@ TEST(fxcrt, WideStringFormatPrecision) {
     EXPECT_EQ(L"Bad precision", str);
   }
 }
+
+TEST(fxcrt, EmptyWideString) {
+  CFX_WideString empty_str;
+  EXPECT_TRUE(empty_str.IsEmpty());
+  EXPECT_EQ(0, empty_str.GetLength());
+  const FX_WCHAR* cstr = empty_str.c_str();
+  EXPECT_EQ(0, FXSYS_wcslen(cstr));
+}