Another missing string_view test

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@312691 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp

@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// basic_string<charT,traits,Allocator>& operator=(basic_string_view<charT, traits> sv);
+
+#include <string>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s1, SV sv)
+{
+    typedef typename S::traits_type T;
+    s1 = sv;
+    LIBCPP_ASSERT(s1.__invariants());
+    assert(s1.size() == sv.size());
+    assert(T::compare(s1.data(), sv.data(), s1.size()) == 0);
+    assert(s1.capacity() >= s1.size());
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(""));
+    test(S("1"), SV(""));
+    test(S(), SV("1"));
+    test(S("1"), SV("2"));
+    test(S("1"), SV("2"));
+
+    test(S(),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("123456789"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
+           "1234567890123456789012345678901234567890123456789012345678901234567890"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::string_view SV;
+    test(S(), SV(""));
+    test(S("1"), SV(""));
+    test(S(), SV("1"));
+    test(S("1"), SV("2"));
+    test(S("1"), SV("2"));
+
+    test(S(),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("123456789"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
+           "1234567890123456789012345678901234567890123456789012345678901234567890"),
+         SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
+    }
+#endif
+}