Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/experimental/string.view/string.view.modifiers/clear.pass.cpp

@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void clear() noexcept
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    sv1.clear ();
+    assert ( sv1.data() == nullptr );
+    assert ( sv1.size() == 0 );
+    assert ( sv1 == SV());
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.clear();
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    static_assert ( test_ce (5) == 0, "" );
+#endif
+
+}