Add more string_view tests

llvm-svn: 312690

2 files changed, 670 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
new file mode 100644
index 00000000000..ec81001df66
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
@@ -0,0 +1,286 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>&
+//   replace(const_iterator i1, const_iterator i2, basic_string_view<charT,traits> sv);
+
+#include <string>
+#include <algorithm>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, typename S::size_type pos1, typename S::size_type n1, SV sv, S expected)
+{
+    typename S::size_type old_size = s.size();
+    typename S::const_iterator first = s.begin() + pos1;
+    typename S::const_iterator last = s.begin() + pos1 + n1;
+    typename S::size_type xlen = last - first;
+    s.replace(first, last, sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == expected);
+    typename S::size_type rlen = sv.size();
+    assert(s.size() == old_size - xlen + rlen);
+}
+
+template <class S, class SV>
+void test0()
+{
+    test(S(""), 0, 0, SV(""), S(""));
+    test(S(""), 0, 0, SV("12345"), S("12345"));
+    test(S(""), 0, 0, SV("1234567890"), S("1234567890"));
+    test(S(""), 0, 0, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcde"), 0, 0, SV(""), S("abcde"));
+    test(S("abcde"), 0, 0, SV("12345"), S("12345abcde"));
+    test(S("abcde"), 0, 0, SV("1234567890"), S("1234567890abcde"));
+    test(S("abcde"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcde"));
+    test(S("abcde"), 0, 1, SV(""), S("bcde"));
+    test(S("abcde"), 0, 1, SV("12345"), S("12345bcde"));
+    test(S("abcde"), 0, 1, SV("1234567890"), S("1234567890bcde"));
+    test(S("abcde"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcde"));
+    test(S("abcde"), 0, 2, SV(""), S("cde"));
+    test(S("abcde"), 0, 2, SV("12345"), S("12345cde"));
+    test(S("abcde"), 0, 2, SV("1234567890"), S("1234567890cde"));
+    test(S("abcde"), 0, 2, SV("12345678901234567890"), S("12345678901234567890cde"));
+    test(S("abcde"), 0, 4, SV(""), S("e"));
+    test(S("abcde"), 0, 4, SV("12345"), S("12345e"));
+    test(S("abcde"), 0, 4, SV("1234567890"), S("1234567890e"));
+    test(S("abcde"), 0, 4, SV("12345678901234567890"), S("12345678901234567890e"));
+    test(S("abcde"), 0, 5, SV(""), S(""));
+    test(S("abcde"), 0, 5, SV("12345"), S("12345"));
+    test(S("abcde"), 0, 5, SV("1234567890"), S("1234567890"));
+    test(S("abcde"), 0, 5, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcde"), 1, 0, SV(""), S("abcde"));
+    test(S("abcde"), 1, 0, SV("12345"), S("a12345bcde"));
+    test(S("abcde"), 1, 0, SV("1234567890"), S("a1234567890bcde"));
+    test(S("abcde"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcde"));
+    test(S("abcde"), 1, 1, SV(""), S("acde"));
+    test(S("abcde"), 1, 1, SV("12345"), S("a12345cde"));
+    test(S("abcde"), 1, 1, SV("1234567890"), S("a1234567890cde"));
+    test(S("abcde"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cde"));
+    test(S("abcde"), 1, 2, SV(""), S("ade"));
+    test(S("abcde"), 1, 2, SV("12345"), S("a12345de"));
+    test(S("abcde"), 1, 2, SV("1234567890"), S("a1234567890de"));
+    test(S("abcde"), 1, 2, SV("12345678901234567890"), S("a12345678901234567890de"));
+    test(S("abcde"), 1, 3, SV(""), S("ae"));
+    test(S("abcde"), 1, 3, SV("12345"), S("a12345e"));
+    test(S("abcde"), 1, 3, SV("1234567890"), S("a1234567890e"));
+    test(S("abcde"), 1, 3, SV("12345678901234567890"), S("a12345678901234567890e"));
+    test(S("abcde"), 1, 4, SV(""), S("a"));
+    test(S("abcde"), 1, 4, SV("12345"), S("a12345"));
+    test(S("abcde"), 1, 4, SV("1234567890"), S("a1234567890"));
+    test(S("abcde"), 1, 4, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcde"), 2, 0, SV(""), S("abcde"));
+    test(S("abcde"), 2, 0, SV("12345"), S("ab12345cde"));
+    test(S("abcde"), 2, 0, SV("1234567890"), S("ab1234567890cde"));
+    test(S("abcde"), 2, 0, SV("12345678901234567890"), S("ab12345678901234567890cde"));
+    test(S("abcde"), 2, 1, SV(""), S("abde"));
+    test(S("abcde"), 2, 1, SV("12345"), S("ab12345de"));
+    test(S("abcde"), 2, 1, SV("1234567890"), S("ab1234567890de"));
+    test(S("abcde"), 2, 1, SV("12345678901234567890"), S("ab12345678901234567890de"));
+    test(S("abcde"), 2, 2, SV(""), S("abe"));
+    test(S("abcde"), 2, 2, SV("12345"), S("ab12345e"));
+    test(S("abcde"), 2, 2, SV("1234567890"), S("ab1234567890e"));
+    test(S("abcde"), 2, 2, SV("12345678901234567890"), S("ab12345678901234567890e"));
+    test(S("abcde"), 2, 3, SV(""), S("ab"));
+    test(S("abcde"), 2, 3, SV("12345"), S("ab12345"));
+    test(S("abcde"), 2, 3, SV("1234567890"), S("ab1234567890"));
+    test(S("abcde"), 2, 3, SV("12345678901234567890"), S("ab12345678901234567890"));
+    test(S("abcde"), 4, 0, SV(""), S("abcde"));
+    test(S("abcde"), 4, 0, SV("12345"), S("abcd12345e"));
+    test(S("abcde"), 4, 0, SV("1234567890"), S("abcd1234567890e"));
+    test(S("abcde"), 4, 0, SV("12345678901234567890"), S("abcd12345678901234567890e"));
+    test(S("abcde"), 4, 1, SV(""), S("abcd"));
+    test(S("abcde"), 4, 1, SV("12345"), S("abcd12345"));
+    test(S("abcde"), 4, 1, SV("1234567890"), S("abcd1234567890"));
+    test(S("abcde"), 4, 1, SV("12345678901234567890"), S("abcd12345678901234567890"));
+    test(S("abcde"), 5, 0, SV(""), S("abcde"));
+    test(S("abcde"), 5, 0, SV("12345"), S("abcde12345"));
+    test(S("abcde"), 5, 0, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcde"), 5, 0, SV("12345678901234567890"), S("abcde12345678901234567890"));
+    test(S("abcdefghij"), 0, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("12345"), S("12345abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("1234567890"), S("1234567890abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV(""), S("bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("12345"), S("12345bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("1234567890"), S("1234567890bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcdefghij"));
+    test(S("abcdefghij"), 0, 5, SV(""), S("fghij"));
+    test(S("abcdefghij"), 0, 5, SV("12345"), S("12345fghij"));
+    test(S("abcdefghij"), 0, 5, SV("1234567890"), S("1234567890fghij"));
+    test(S("abcdefghij"), 0, 5, SV("12345678901234567890"), S("12345678901234567890fghij"));
+    test(S("abcdefghij"), 0, 9, SV(""), S("j"));
+    test(S("abcdefghij"), 0, 9, SV("12345"), S("12345j"));
+    test(S("abcdefghij"), 0, 9, SV("1234567890"), S("1234567890j"));
+    test(S("abcdefghij"), 0, 9, SV("12345678901234567890"), S("12345678901234567890j"));
+    test(S("abcdefghij"), 0, 10, SV(""), S(""));
+    test(S("abcdefghij"), 0, 10, SV("12345"), S("12345"));
+    test(S("abcdefghij"), 0, 10, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghij"), 0, 10, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghij"), 1, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("12345"), S("a12345bcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("1234567890"), S("a1234567890bcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcdefghij"));
+    test(S("abcdefghij"), 1, 1, SV(""), S("acdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("12345"), S("a12345cdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("1234567890"), S("a1234567890cdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cdefghij"));
+}
+
+template <class S, class SV>
+void test1()
+{
+    test(S("abcdefghij"), 1, 4, SV(""), S("afghij"));
+    test(S("abcdefghij"), 1, 4, SV("12345"), S("a12345fghij"));
+    test(S("abcdefghij"), 1, 4, SV("1234567890"), S("a1234567890fghij"));
+    test(S("abcdefghij"), 1, 4, SV("12345678901234567890"), S("a12345678901234567890fghij"));
+    test(S("abcdefghij"), 1, 8, SV(""), S("aj"));
+    test(S("abcdefghij"), 1, 8, SV("12345"), S("a12345j"));
+    test(S("abcdefghij"), 1, 8, SV("1234567890"), S("a1234567890j"));
+    test(S("abcdefghij"), 1, 8, SV("12345678901234567890"), S("a12345678901234567890j"));
+    test(S("abcdefghij"), 1, 9, SV(""), S("a"));
+    test(S("abcdefghij"), 1, 9, SV("12345"), S("a12345"));
+    test(S("abcdefghij"), 1, 9, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghij"), 1, 9, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghij"), 5, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 5, 0, SV("12345"), S("abcde12345fghij"));
+    test(S("abcdefghij"), 5, 0, SV("1234567890"), S("abcde1234567890fghij"));
+    test(S("abcdefghij"), 5, 0, SV("12345678901234567890"), S("abcde12345678901234567890fghij"));
+    test(S("abcdefghij"), 5, 1, SV(""), S("abcdeghij"));
+    test(S("abcdefghij"), 5, 1, SV("12345"), S("abcde12345ghij"));
+    test(S("abcdefghij"), 5, 1, SV("1234567890"), S("abcde1234567890ghij"));
+    test(S("abcdefghij"), 5, 1, SV("12345678901234567890"), S("abcde12345678901234567890ghij"));
+    test(S("abcdefghij"), 5, 2, SV(""), S("abcdehij"));
+    test(S("abcdefghij"), 5, 2, SV("12345"), S("abcde12345hij"));
+    test(S("abcdefghij"), 5, 2, SV("1234567890"), S("abcde1234567890hij"));
+    test(S("abcdefghij"), 5, 2, SV("12345678901234567890"), S("abcde12345678901234567890hij"));
+    test(S("abcdefghij"), 5, 4, SV(""), S("abcdej"));
+    test(S("abcdefghij"), 5, 4, SV("12345"), S("abcde12345j"));
+    test(S("abcdefghij"), 5, 4, SV("1234567890"), S("abcde1234567890j"));
+    test(S("abcdefghij"), 5, 4, SV("12345678901234567890"), S("abcde12345678901234567890j"));
+    test(S("abcdefghij"), 5, 5, SV(""), S("abcde"));
+    test(S("abcdefghij"), 5, 5, SV("12345"), S("abcde12345"));
+    test(S("abcdefghij"), 5, 5, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcdefghij"), 5, 5, SV("12345678901234567890"), S("abcde12345678901234567890"));
+    test(S("abcdefghij"), 9, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 9, 0, SV("12345"), S("abcdefghi12345j"));
+    test(S("abcdefghij"), 9, 0, SV("1234567890"), S("abcdefghi1234567890j"));
+    test(S("abcdefghij"), 9, 0, SV("12345678901234567890"), S("abcdefghi12345678901234567890j"));
+    test(S("abcdefghij"), 9, 1, SV(""), S("abcdefghi"));
+    test(S("abcdefghij"), 9, 1, SV("12345"), S("abcdefghi12345"));
+    test(S("abcdefghij"), 9, 1, SV("1234567890"), S("abcdefghi1234567890"));
+    test(S("abcdefghij"), 9, 1, SV("12345678901234567890"), S("abcdefghi12345678901234567890"));
+    test(S("abcdefghij"), 10, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 10, 0, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghij"), 10, 0, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghij"), 10, 0, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("12345"), S("12345abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("1234567890"), S("1234567890abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV(""), S("bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("12345"), S("12345bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("1234567890"), S("1234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV(""), S("klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("12345"), S("12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("1234567890"), S("1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("12345678901234567890"), S("12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV(""), S("t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("12345"), S("12345t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("1234567890"), S("1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("12345678901234567890"), S("12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV(""), S(""));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("12345"), S("12345"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("12345"), S("a12345bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("1234567890"), S("a1234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV(""), S("acdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("12345"), S("a12345cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("1234567890"), S("a1234567890cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV(""), S("aklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("12345"), S("a12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("1234567890"), S("a1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("12345678901234567890"), S("a12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV(""), S("at"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("12345"), S("a12345t"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("1234567890"), S("a1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("12345678901234567890"), S("a12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV(""), S("a"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("12345"), S("a12345"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("12345"), S("abcdefghij12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("1234567890"), S("abcdefghij1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("12345678901234567890"), S("abcdefghij12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV(""), S("abcdefghijlmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("12345"), S("abcdefghij12345lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("1234567890"), S("abcdefghij1234567890lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("12345678901234567890"), S("abcdefghij12345678901234567890lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV(""), S("abcdefghijpqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("12345"), S("abcdefghij12345pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("1234567890"), S("abcdefghij1234567890pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("12345678901234567890"), S("abcdefghij12345678901234567890pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV(""), S("abcdefghijt"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("12345"), S("abcdefghij12345t"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("1234567890"), S("abcdefghij1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("12345678901234567890"), S("abcdefghij12345678901234567890t"));
+}
+
+template <class S, class SV>
+void test2()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV(""), S("abcdefghij"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("12345"), S("abcdefghijklmnopqrs12345t"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("1234567890"), S("abcdefghijklmnopqrs1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV(""), S("abcdefghijklmnopqrs"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("12345"), S("abcdefghijklmnopqrs12345"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("1234567890"), S("abcdefghijklmnopqrs1234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("12345"), S("abcdefghijklmnopqrst12345"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test0<S, SV>();
+    test1<S, SV>();
+    test2<S, SV>();
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::string_view SV;
+    test0<S, SV>();
+    test1<S, SV>();
+    test2<S, SV>();
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
new file mode 100644
index 00000000000..60ecd67f1f7
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
@@ -0,0 +1,384 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>&
+//   replace(size_type pos1, size_type n1, basic_string_view<charT,traits> sv);
+
+#include <string>
+#include <stdexcept>
+#include <algorithm>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, typename S::size_type pos1, typename S::size_type n1, SV sv, S expected)
+{
+    const typename S::size_type old_size = s.size();
+    S s0 = s;
+    if (pos1 <= old_size)
+    {
+        s.replace(pos1, n1, sv);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(s == expected);
+        typename S::size_type xlen = std::min(n1, old_size - pos1);
+        typename S::size_type rlen = sv.size();
+        assert(s.size() == old_size - xlen + rlen);
+    }
+#ifndef TEST_HAS_NO_EXCEPTIONS
+    else
+    {
+        try
+        {
+            s.replace(pos1, n1, sv);
+            assert(false);
+        }
+        catch (std::out_of_range&)
+        {
+            assert(pos1 > old_size);
+            assert(s == s0);
+        }
+    }
+#endif
+}
+
+template <class S, class SV>
+void test0()
+{
+    test(S(""), 0, 0, SV(""), S(""));
+    test(S(""), 0, 0, SV("12345"), S("12345"));
+    test(S(""), 0, 0, SV("1234567890"), S("1234567890"));
+    test(S(""), 0, 0, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S(""), 0, 1, SV(""), S(""));
+    test(S(""), 0, 1, SV("12345"), S("12345"));
+    test(S(""), 0, 1, SV("1234567890"), S("1234567890"));
+    test(S(""), 0, 1, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S(""), 1, 0, SV(""), S("can't happen"));
+    test(S(""), 1, 0, SV("12345"), S("can't happen"));
+    test(S(""), 1, 0, SV("1234567890"), S("can't happen"));
+    test(S(""), 1, 0, SV("12345678901234567890"), S("can't happen"));
+    test(S("abcde"), 0, 0, SV(""), S("abcde"));
+    test(S("abcde"), 0, 0, SV("12345"), S("12345abcde"));
+    test(S("abcde"), 0, 0, SV("1234567890"), S("1234567890abcde"));
+    test(S("abcde"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcde"));
+    test(S("abcde"), 0, 1, SV(""), S("bcde"));
+    test(S("abcde"), 0, 1, SV("12345"), S("12345bcde"));
+    test(S("abcde"), 0, 1, SV("1234567890"), S("1234567890bcde"));
+    test(S("abcde"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcde"));
+    test(S("abcde"), 0, 2, SV(""), S("cde"));
+    test(S("abcde"), 0, 2, SV("12345"), S("12345cde"));
+    test(S("abcde"), 0, 2, SV("1234567890"), S("1234567890cde"));
+    test(S("abcde"), 0, 2, SV("12345678901234567890"), S("12345678901234567890cde"));
+    test(S("abcde"), 0, 4, SV(""), S("e"));
+    test(S("abcde"), 0, 4, SV("12345"), S("12345e"));
+    test(S("abcde"), 0, 4, SV("1234567890"), S("1234567890e"));
+    test(S("abcde"), 0, 4, SV("12345678901234567890"), S("12345678901234567890e"));
+    test(S("abcde"), 0, 5, SV(""), S(""));
+    test(S("abcde"), 0, 5, SV("12345"), S("12345"));
+    test(S("abcde"), 0, 5, SV("1234567890"), S("1234567890"));
+    test(S("abcde"), 0, 5, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcde"), 0, 6, SV(""), S(""));
+    test(S("abcde"), 0, 6, SV("12345"), S("12345"));
+    test(S("abcde"), 0, 6, SV("1234567890"), S("1234567890"));
+    test(S("abcde"), 0, 6, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcde"), 1, 0, SV(""), S("abcde"));
+    test(S("abcde"), 1, 0, SV("12345"), S("a12345bcde"));
+    test(S("abcde"), 1, 0, SV("1234567890"), S("a1234567890bcde"));
+    test(S("abcde"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcde"));
+    test(S("abcde"), 1, 1, SV(""), S("acde"));
+    test(S("abcde"), 1, 1, SV("12345"), S("a12345cde"));
+    test(S("abcde"), 1, 1, SV("1234567890"), S("a1234567890cde"));
+    test(S("abcde"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cde"));
+    test(S("abcde"), 1, 2, SV(""), S("ade"));
+    test(S("abcde"), 1, 2, SV("12345"), S("a12345de"));
+    test(S("abcde"), 1, 2, SV("1234567890"), S("a1234567890de"));
+    test(S("abcde"), 1, 2, SV("12345678901234567890"), S("a12345678901234567890de"));
+    test(S("abcde"), 1, 3, SV(""), S("ae"));
+    test(S("abcde"), 1, 3, SV("12345"), S("a12345e"));
+    test(S("abcde"), 1, 3, SV("1234567890"), S("a1234567890e"));
+    test(S("abcde"), 1, 3, SV("12345678901234567890"), S("a12345678901234567890e"));
+    test(S("abcde"), 1, 4, SV(""), S("a"));
+    test(S("abcde"), 1, 4, SV("12345"), S("a12345"));
+    test(S("abcde"), 1, 4, SV("1234567890"), S("a1234567890"));
+    test(S("abcde"), 1, 4, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcde"), 1, 5, SV(""), S("a"));
+    test(S("abcde"), 1, 5, SV("12345"), S("a12345"));
+    test(S("abcde"), 1, 5, SV("1234567890"), S("a1234567890"));
+    test(S("abcde"), 1, 5, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcde"), 2, 0, SV(""), S("abcde"));
+    test(S("abcde"), 2, 0, SV("12345"), S("ab12345cde"));
+    test(S("abcde"), 2, 0, SV("1234567890"), S("ab1234567890cde"));
+    test(S("abcde"), 2, 0, SV("12345678901234567890"), S("ab12345678901234567890cde"));
+    test(S("abcde"), 2, 1, SV(""), S("abde"));
+    test(S("abcde"), 2, 1, SV("12345"), S("ab12345de"));
+    test(S("abcde"), 2, 1, SV("1234567890"), S("ab1234567890de"));
+    test(S("abcde"), 2, 1, SV("12345678901234567890"), S("ab12345678901234567890de"));
+    test(S("abcde"), 2, 2, SV(""), S("abe"));
+    test(S("abcde"), 2, 2, SV("12345"), S("ab12345e"));
+    test(S("abcde"), 2, 2, SV("1234567890"), S("ab1234567890e"));
+    test(S("abcde"), 2, 2, SV("12345678901234567890"), S("ab12345678901234567890e"));
+    test(S("abcde"), 2, 3, SV(""), S("ab"));
+    test(S("abcde"), 2, 3, SV("12345"), S("ab12345"));
+    test(S("abcde"), 2, 3, SV("1234567890"), S("ab1234567890"));
+    test(S("abcde"), 2, 3, SV("12345678901234567890"), S("ab12345678901234567890"));
+    test(S("abcde"), 2, 4, SV(""), S("ab"));
+    test(S("abcde"), 2, 4, SV("12345"), S("ab12345"));
+    test(S("abcde"), 2, 4, SV("1234567890"), S("ab1234567890"));
+    test(S("abcde"), 2, 4, SV("12345678901234567890"), S("ab12345678901234567890"));
+    test(S("abcde"), 4, 0, SV(""), S("abcde"));
+    test(S("abcde"), 4, 0, SV("12345"), S("abcd12345e"));
+    test(S("abcde"), 4, 0, SV("1234567890"), S("abcd1234567890e"));
+    test(S("abcde"), 4, 0, SV("12345678901234567890"), S("abcd12345678901234567890e"));
+    test(S("abcde"), 4, 1, SV(""), S("abcd"));
+    test(S("abcde"), 4, 1, SV("12345"), S("abcd12345"));
+    test(S("abcde"), 4, 1, SV("1234567890"), S("abcd1234567890"));
+    test(S("abcde"), 4, 1, SV("12345678901234567890"), S("abcd12345678901234567890"));
+    test(S("abcde"), 4, 2, SV(""), S("abcd"));
+    test(S("abcde"), 4, 2, SV("12345"), S("abcd12345"));
+    test(S("abcde"), 4, 2, SV("1234567890"), S("abcd1234567890"));
+    test(S("abcde"), 4, 2, SV("12345678901234567890"), S("abcd12345678901234567890"));
+    test(S("abcde"), 5, 0, SV(""), S("abcde"));
+    test(S("abcde"), 5, 0, SV("12345"), S("abcde12345"));
+    test(S("abcde"), 5, 0, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcde"), 5, 0, SV("12345678901234567890"), S("abcde12345678901234567890"));
+    test(S("abcde"), 5, 1, SV(""), S("abcde"));
+    test(S("abcde"), 5, 1, SV("12345"), S("abcde12345"));
+    test(S("abcde"), 5, 1, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcde"), 5, 1, SV("12345678901234567890"), S("abcde12345678901234567890"));
+}
+
+template <class S, class SV>
+void test1()
+{
+    test(S("abcde"), 6, 0, SV(""), S("can't happen"));
+    test(S("abcde"), 6, 0, SV("12345"), S("can't happen"));
+    test(S("abcde"), 6, 0, SV("1234567890"), S("can't happen"));
+    test(S("abcde"), 6, 0, SV("12345678901234567890"), S("can't happen"));
+    test(S("abcdefghij"), 0, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("12345"), S("12345abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("1234567890"), S("1234567890abcdefghij"));
+    test(S("abcdefghij"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV(""), S("bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("12345"), S("12345bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("1234567890"), S("1234567890bcdefghij"));
+    test(S("abcdefghij"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcdefghij"));
+    test(S("abcdefghij"), 0, 5, SV(""), S("fghij"));
+    test(S("abcdefghij"), 0, 5, SV("12345"), S("12345fghij"));
+    test(S("abcdefghij"), 0, 5, SV("1234567890"), S("1234567890fghij"));
+    test(S("abcdefghij"), 0, 5, SV("12345678901234567890"), S("12345678901234567890fghij"));
+    test(S("abcdefghij"), 0, 9, SV(""), S("j"));
+    test(S("abcdefghij"), 0, 9, SV("12345"), S("12345j"));
+    test(S("abcdefghij"), 0, 9, SV("1234567890"), S("1234567890j"));
+    test(S("abcdefghij"), 0, 9, SV("12345678901234567890"), S("12345678901234567890j"));
+    test(S("abcdefghij"), 0, 10, SV(""), S(""));
+    test(S("abcdefghij"), 0, 10, SV("12345"), S("12345"));
+    test(S("abcdefghij"), 0, 10, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghij"), 0, 10, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghij"), 0, 11, SV(""), S(""));
+    test(S("abcdefghij"), 0, 11, SV("12345"), S("12345"));
+    test(S("abcdefghij"), 0, 11, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghij"), 0, 11, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghij"), 1, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("12345"), S("a12345bcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("1234567890"), S("a1234567890bcdefghij"));
+    test(S("abcdefghij"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcdefghij"));
+    test(S("abcdefghij"), 1, 1, SV(""), S("acdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("12345"), S("a12345cdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("1234567890"), S("a1234567890cdefghij"));
+    test(S("abcdefghij"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cdefghij"));
+    test(S("abcdefghij"), 1, 4, SV(""), S("afghij"));
+    test(S("abcdefghij"), 1, 4, SV("12345"), S("a12345fghij"));
+    test(S("abcdefghij"), 1, 4, SV("1234567890"), S("a1234567890fghij"));
+    test(S("abcdefghij"), 1, 4, SV("12345678901234567890"), S("a12345678901234567890fghij"));
+    test(S("abcdefghij"), 1, 8, SV(""), S("aj"));
+    test(S("abcdefghij"), 1, 8, SV("12345"), S("a12345j"));
+    test(S("abcdefghij"), 1, 8, SV("1234567890"), S("a1234567890j"));
+    test(S("abcdefghij"), 1, 8, SV("12345678901234567890"), S("a12345678901234567890j"));
+    test(S("abcdefghij"), 1, 9, SV(""), S("a"));
+    test(S("abcdefghij"), 1, 9, SV("12345"), S("a12345"));
+    test(S("abcdefghij"), 1, 9, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghij"), 1, 9, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghij"), 1, 10, SV(""), S("a"));
+    test(S("abcdefghij"), 1, 10, SV("12345"), S("a12345"));
+    test(S("abcdefghij"), 1, 10, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghij"), 1, 10, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghij"), 5, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 5, 0, SV("12345"), S("abcde12345fghij"));
+    test(S("abcdefghij"), 5, 0, SV("1234567890"), S("abcde1234567890fghij"));
+    test(S("abcdefghij"), 5, 0, SV("12345678901234567890"), S("abcde12345678901234567890fghij"));
+    test(S("abcdefghij"), 5, 1, SV(""), S("abcdeghij"));
+    test(S("abcdefghij"), 5, 1, SV("12345"), S("abcde12345ghij"));
+    test(S("abcdefghij"), 5, 1, SV("1234567890"), S("abcde1234567890ghij"));
+    test(S("abcdefghij"), 5, 1, SV("12345678901234567890"), S("abcde12345678901234567890ghij"));
+    test(S("abcdefghij"), 5, 2, SV(""), S("abcdehij"));
+    test(S("abcdefghij"), 5, 2, SV("12345"), S("abcde12345hij"));
+    test(S("abcdefghij"), 5, 2, SV("1234567890"), S("abcde1234567890hij"));
+    test(S("abcdefghij"), 5, 2, SV("12345678901234567890"), S("abcde12345678901234567890hij"));
+    test(S("abcdefghij"), 5, 4, SV(""), S("abcdej"));
+    test(S("abcdefghij"), 5, 4, SV("12345"), S("abcde12345j"));
+    test(S("abcdefghij"), 5, 4, SV("1234567890"), S("abcde1234567890j"));
+    test(S("abcdefghij"), 5, 4, SV("12345678901234567890"), S("abcde12345678901234567890j"));
+    test(S("abcdefghij"), 5, 5, SV(""), S("abcde"));
+    test(S("abcdefghij"), 5, 5, SV("12345"), S("abcde12345"));
+    test(S("abcdefghij"), 5, 5, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcdefghij"), 5, 5, SV("12345678901234567890"), S("abcde12345678901234567890"));
+    test(S("abcdefghij"), 5, 6, SV(""), S("abcde"));
+    test(S("abcdefghij"), 5, 6, SV("12345"), S("abcde12345"));
+    test(S("abcdefghij"), 5, 6, SV("1234567890"), S("abcde1234567890"));
+    test(S("abcdefghij"), 5, 6, SV("12345678901234567890"), S("abcde12345678901234567890"));
+    test(S("abcdefghij"), 9, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 9, 0, SV("12345"), S("abcdefghi12345j"));
+    test(S("abcdefghij"), 9, 0, SV("1234567890"), S("abcdefghi1234567890j"));
+    test(S("abcdefghij"), 9, 0, SV("12345678901234567890"), S("abcdefghi12345678901234567890j"));
+    test(S("abcdefghij"), 9, 1, SV(""), S("abcdefghi"));
+    test(S("abcdefghij"), 9, 1, SV("12345"), S("abcdefghi12345"));
+    test(S("abcdefghij"), 9, 1, SV("1234567890"), S("abcdefghi1234567890"));
+    test(S("abcdefghij"), 9, 1, SV("12345678901234567890"), S("abcdefghi12345678901234567890"));
+    test(S("abcdefghij"), 9, 2, SV(""), S("abcdefghi"));
+    test(S("abcdefghij"), 9, 2, SV("12345"), S("abcdefghi12345"));
+    test(S("abcdefghij"), 9, 2, SV("1234567890"), S("abcdefghi1234567890"));
+    test(S("abcdefghij"), 9, 2, SV("12345678901234567890"), S("abcdefghi12345678901234567890"));
+    test(S("abcdefghij"), 10, 0, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 10, 0, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghij"), 10, 0, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghij"), 10, 0, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghij"), 10, 1, SV(""), S("abcdefghij"));
+    test(S("abcdefghij"), 10, 1, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghij"), 10, 1, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghij"), 10, 1, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghij"), 11, 0, SV(""), S("can't happen"));
+    test(S("abcdefghij"), 11, 0, SV("12345"), S("can't happen"));
+    test(S("abcdefghij"), 11, 0, SV("1234567890"), S("can't happen"));
+    test(S("abcdefghij"), 11, 0, SV("12345678901234567890"), S("can't happen"));
+}
+
+template <class S, class SV>
+void test2()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("12345"), S("12345abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("1234567890"), S("1234567890abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 0, SV("12345678901234567890"), S("12345678901234567890abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV(""), S("bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("12345"), S("12345bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("1234567890"), S("1234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 1, SV("12345678901234567890"), S("12345678901234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV(""), S("klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("12345"), S("12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("1234567890"), S("1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 10, SV("12345678901234567890"), S("12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV(""), S("t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("12345"), S("12345t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("1234567890"), S("1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 0, 19, SV("12345678901234567890"), S("12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV(""), S(""));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("12345"), S("12345"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghijklmnopqrst"), 0, 20, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 0, 21, SV(""), S(""));
+    test(S("abcdefghijklmnopqrst"), 0, 21, SV("12345"), S("12345"));
+    test(S("abcdefghijklmnopqrst"), 0, 21, SV("1234567890"), S("1234567890"));
+    test(S("abcdefghijklmnopqrst"), 0, 21, SV("12345678901234567890"), S("12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("12345"), S("a12345bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("1234567890"), S("a1234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 0, SV("12345678901234567890"), S("a12345678901234567890bcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV(""), S("acdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("12345"), S("a12345cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("1234567890"), S("a1234567890cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 1, SV("12345678901234567890"), S("a12345678901234567890cdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV(""), S("aklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("12345"), S("a12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("1234567890"), S("a1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 9, SV("12345678901234567890"), S("a12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV(""), S("at"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("12345"), S("a12345t"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("1234567890"), S("a1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 1, 18, SV("12345678901234567890"), S("a12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV(""), S("a"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("12345"), S("a12345"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 19, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 20, SV(""), S("a"));
+    test(S("abcdefghijklmnopqrst"), 1, 20, SV("12345"), S("a12345"));
+    test(S("abcdefghijklmnopqrst"), 1, 20, SV("1234567890"), S("a1234567890"));
+    test(S("abcdefghijklmnopqrst"), 1, 20, SV("12345678901234567890"), S("a12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("12345"), S("abcdefghij12345klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("1234567890"), S("abcdefghij1234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 0, SV("12345678901234567890"), S("abcdefghij12345678901234567890klmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV(""), S("abcdefghijlmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("12345"), S("abcdefghij12345lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("1234567890"), S("abcdefghij1234567890lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 1, SV("12345678901234567890"), S("abcdefghij12345678901234567890lmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV(""), S("abcdefghijpqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("12345"), S("abcdefghij12345pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("1234567890"), S("abcdefghij1234567890pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 5, SV("12345678901234567890"), S("abcdefghij12345678901234567890pqrst"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV(""), S("abcdefghijt"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("12345"), S("abcdefghij12345t"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("1234567890"), S("abcdefghij1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 10, 9, SV("12345678901234567890"), S("abcdefghij12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV(""), S("abcdefghij"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 10, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 11, SV(""), S("abcdefghij"));
+    test(S("abcdefghijklmnopqrst"), 10, 11, SV("12345"), S("abcdefghij12345"));
+    test(S("abcdefghijklmnopqrst"), 10, 11, SV("1234567890"), S("abcdefghij1234567890"));
+    test(S("abcdefghijklmnopqrst"), 10, 11, SV("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("12345"), S("abcdefghijklmnopqrs12345t"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("1234567890"), S("abcdefghijklmnopqrs1234567890t"));
+    test(S("abcdefghijklmnopqrst"), 19, 0, SV("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890t"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV(""), S("abcdefghijklmnopqrs"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("12345"), S("abcdefghijklmnopqrs12345"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("1234567890"), S("abcdefghijklmnopqrs1234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 1, SV("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 2, SV(""), S("abcdefghijklmnopqrs"));
+    test(S("abcdefghijklmnopqrst"), 19, 2, SV("12345"), S("abcdefghijklmnopqrs12345"));
+    test(S("abcdefghijklmnopqrst"), 19, 2, SV("1234567890"), S("abcdefghijklmnopqrs1234567890"));
+    test(S("abcdefghijklmnopqrst"), 19, 2, SV("12345678901234567890"), S("abcdefghijklmnopqrs12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("12345"), S("abcdefghijklmnopqrst12345"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 0, SV("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 1, SV(""), S("abcdefghijklmnopqrst"));
+    test(S("abcdefghijklmnopqrst"), 20, 1, SV("12345"), S("abcdefghijklmnopqrst12345"));
+    test(S("abcdefghijklmnopqrst"), 20, 1, SV("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test(S("abcdefghijklmnopqrst"), 20, 1, SV("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+    test(S("abcdefghijklmnopqrst"), 21, 0, SV(""), S("can't happen"));
+    test(S("abcdefghijklmnopqrst"), 21, 0, SV("12345"), S("can't happen"));
+    test(S("abcdefghijklmnopqrst"), 21, 0, SV("1234567890"), S("can't happen"));
+    test(S("abcdefghijklmnopqrst"), 21, 0, SV("12345678901234567890"), S("can't happen"));
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test0<S, SV>();
+    test1<S, SV>();
+    test2<S, SV>();
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::string_view SV;
+    test0<S, SV>();
+    test1<S, SV>();
+    test2<S, SV>();
+    }
+#endif
+}