LWG issue 2341; Make the two variants of basic_ostream::seekp and basic_istream::seekg behave consistently; update tests to make sure

llvm-svn: 193814

2 files changed, 8 insertions, 2 deletions

diff --git a/libcxx/test/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp b/libcxx/test/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
index 005b3b48446..73f3da1c6bd 100644
--- a/libcxx/test/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
+++ b/libcxx/test/input.output/iostream.format/input.streams/istream.unformatted/seekg_off.pass.cpp
@@ -57,12 +57,18 @@ int main()
         is.seekg(5, std::ios_base::cur);
         assert(is.good());
         assert(seekoff_called == 1);
+        is.seekg(-1, std::ios_base::beg);
+        assert(is.fail());
+        assert(seekoff_called == 2);
     }
     {
         testbuf<wchar_t> sb(L" 123456789");
         std::wistream is(&sb);
         is.seekg(5, std::ios_base::cur);
         assert(is.good());
-        assert(seekoff_called == 2);
+        assert(seekoff_called == 3);
+        is.seekg(-1, std::ios_base::beg);
+        assert(is.fail());
+        assert(seekoff_called == 4);
     }
 }
diff --git a/libcxx/test/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp b/libcxx/test/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
index 16fbf656076..69b26f3a96e 100644
--- a/libcxx/test/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
+++ b/libcxx/test/input.output/iostream.format/output.streams/ostream.seeks/seekp2.pass.cpp
@@ -54,6 +54,6 @@ int main()
         assert(os.good());
         assert(&os.seekp(-1, std::ios_base::beg) == &os);
         assert(seekoff_called == 2);
-        assert(os.good());
+        assert(os.fail());
     }
 }