diff --git a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_fr_FR.pass.cpp
@@ -28,6 +28,7 @@
 #include <cassert>
 #include "test_iterators.h"
 
+#include "locale_helpers.h"
 #include "platform_support.h" // locale name macros
 #include "test_macros.h"
 
@@ -52,36 +53,8 @@
         : Fw(refs) {}
 };
 
-// GLIBC 2.27 and newer use U+202F NARROW NO-BREAK SPACE as a thousands separator.
-// This function converts the spaces in string inputs to U+202F if need
-// be. FreeBSD's locale data also uses U+202F, since 2018.
-// Windows uses U+00A0 NO-BREAK SPACE.
 static std::wstring convert_thousands_sep(std::wstring const& in) {
-#if defined(_CS_GNU_LIBC_VERSION) || defined(__FreeBSD__) || defined(_WIN32)
-#if defined(_CS_GNU_LIBC_VERSION)
-  if (glibc_version_less_than("2.27"))
-    return in;
-#endif
-  std::wstring out;
-  unsigned I = 0;
-  bool seen_decimal = false;
-  for (; I < in.size(); ++I) {
-    if (seen_decimal || in[I] != L' ') {
-      seen_decimal |= in[I] == L',';
-      out.push_back(in[I]);
-      continue;
-    }
-    assert(in[I] == L' ');
-#if defined(_WIN32)
-    out.push_back(L'\u00A0');
-#else
-    out.push_back(L'\u202F');
-#endif
-  }
-  return out;
-#else
-  return in;
-#endif
+  return LocaleHelpers::convert_thousands_sep_fr_FR(in);
 }
 #endif // TEST_HAS_NO_WIDE_CHARACTERS
 
diff --git a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
@@ -9,14 +9,6 @@
 // NetBSD does not support LC_MONETARY at the moment
 // XFAIL: netbsd
 
-// Failure related to GLIBC's use of U00A0 as mon_thousands_sep
-// and U002E as mon_decimal_point.
-// TODO: U00A0 should be investigated.
-// Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16006
-// XFAIL: linux
-
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // REQUIRES: locale.ru_RU.UTF-8
 
 // <locale>
@@ -33,6 +25,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
+#include "locale_helpers.h"
 #include "platform_support.h" // locale name macros
 
 typedef std::money_get<char, cpp17_input_iterator<const char*> > Fn;
@@ -55,7 +48,11 @@
     explicit my_facetw(std::size_t refs = 0)
         : Fw(refs) {}
 };
-#endif
+
+static std::wstring convert_thousands_sep(std::wstring const& in) {
+  return LocaleHelpers::convert_thousands_sep_ru_RU(in);
+}
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
 
 int main(int, char**)
 {
@@ -71,6 +68,7 @@
     ios.imbue(std::locale(ios.getloc(),
                           new std::moneypunct_byname<wchar_t, true>(loc_name)));
 #endif
+    std::string symbol = LocaleHelpers::currency_symbol_ru_RU();
     {
         const my_facet f(1);
         // char, national
@@ -130,7 +128,7 @@
             assert(ex == -123456789);
         }
         {   // zero, showbase
-            std::string v = "0,00 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "0,00 " + symbol;
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -141,7 +139,7 @@
             assert(ex == 0);
         }
         {   // zero, showbase
-            std::string v = "0,00 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "0,00 " + symbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
@@ -154,7 +152,7 @@
             std::noshowbase(ios);
         }
         {   // negative one, showbase
-            std::string v = "-0,01 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "-0,01 " + symbol;
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -165,7 +163,7 @@
             assert(ex == -1);
         }
         {   // negative one, showbase
-            std::string v = "-0,01 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "-0,01 " + symbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
@@ -178,7 +176,7 @@
             std::noshowbase(ios);
         }
         {   // positive, showbase
-            std::string v = "1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "1 234 567,89 " + symbol;
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -189,7 +187,7 @@
             assert(ex == 123456789);
         }
         {   // positive, showbase
-            std::string v = "1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "1 234 567,89 " + symbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
@@ -202,7 +200,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::string v = "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "-1 234 567,89 " + symbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
@@ -382,7 +380,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::string v = "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "-1 234 567,89 " + symbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
@@ -394,7 +392,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::string v = "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".";
+            std::string v = "-1 234 567,89 " + symbol;
             typedef cpp17_input_iterator<const char*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -406,6 +404,7 @@
         }
     }
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
+    std::wstring wsymbol = LocaleHelpers::currency_wsymbol_ru_RU();
     {
         const my_facetw f(1);
         // wchar_t, national
@@ -432,7 +431,7 @@
             assert(ex == -1);
         }
         {   // positive
-            std::wstring v = L"1 234 567,89 ";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 ");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -443,7 +442,7 @@
             assert(ex == 123456789);
         }
         {   // negative
-            std::wstring v = L"-1 234 567,89 ";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 ");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -465,7 +464,7 @@
             assert(ex == -123456789);
         }
         {   // zero, showbase
-            std::wstring v = L"0,00 \x440\x443\x431"".";
+            std::wstring v = L"0,00 " + wsymbol;
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -476,7 +475,7 @@
             assert(ex == 0);
         }
         {   // zero, showbase
-            std::wstring v = L"0,00 \x440\x443\x431"".";
+            std::wstring v = L"0,00 " + wsymbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -489,7 +488,7 @@
             std::noshowbase(ios);
         }
         {   // negative one, showbase
-            std::wstring v = L"-0,01 \x440\x443\x431"".";
+            std::wstring v = L"-0,01 " + wsymbol;
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -500,7 +499,7 @@
             assert(ex == -1);
         }
         {   // negative one, showbase
-            std::wstring v = L"-0,01 \x440\x443\x431"".";
+            std::wstring v = L"-0,01 " + wsymbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -513,7 +512,7 @@
             std::noshowbase(ios);
         }
         {   // positive, showbase
-            std::wstring v = L"1 234 567,89 \x440\x443\x431"".";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 ") + wsymbol;
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -524,7 +523,7 @@
             assert(ex == 123456789);
         }
         {   // positive, showbase
-            std::wstring v = L"1 234 567,89 \x440\x443\x431"".";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 ") + wsymbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -537,7 +536,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 \x440\x443\x431"".";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 ") + wsymbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -550,7 +549,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 RUB";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 RUB");
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -562,7 +561,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 RUB";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 RUB");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -599,7 +598,7 @@
             assert(ex == -1);
         }
         {   // positive
-            std::wstring v = L"1 234 567,89 ";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 ");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -610,7 +609,7 @@
             assert(ex == 123456789);
         }
         {   // negative
-            std::wstring v = L"-1 234 567,89 ";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 ");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -680,7 +679,7 @@
             std::noshowbase(ios);
         }
         {   // positive, showbase
-            std::wstring v = L"1 234 567,89 RUB";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 RUB");
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
@@ -691,7 +690,7 @@
             assert(ex == 123456789);
         }
         {   // positive, showbase
-            std::wstring v = L"1 234 567,89 RUB";
+            std::wstring v = convert_thousands_sep(L"1 234 567,89 RUB");
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -704,7 +703,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 RUB";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 RUB");
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -717,7 +716,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 \x440\x443\x431"".";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 ") + wsymbol;
             std::showbase(ios);
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
@@ -729,7 +728,7 @@
             std::noshowbase(ios);
         }
         {   // negative, showbase
-            std::wstring v = L"-1 234 567,89 \x440\x443\x431"".";
+            std::wstring v = convert_thousands_sep(L"-1 234 567,89 ") + wsymbol;
             typedef cpp17_input_iterator<const wchar_t*> I;
             long double ex;
             std::ios_base::iostate err = std::ios_base::goodbit;
diff --git a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_fr_FR.pass.cpp
@@ -28,6 +28,7 @@
 #include <cassert>
 #include "test_iterators.h"
 
+#include "locale_helpers.h"
 #include "platform_support.h" // locale name macros
 #include "test_macros.h"
 
@@ -52,38 +53,8 @@
         : Fw(refs) {}
 };
 
-// GLIBC 2.27 and newer use U+202F NARROW NO-BREAK SPACE as a thousands separator.
-// This function converts the spaces in string inputs to U+202F if need
-// be. FreeBSD's locale data also uses U+202F, since 2018.
-// Windows uses U+00A0 NO-BREAK SPACE.
 static std::wstring convert_thousands_sep(std::wstring const& in) {
-#if defined(_CS_GNU_LIBC_VERSION) || defined(__FreeBSD__) || defined(_WIN32)
-#if defined(_CS_GNU_LIBC_VERSION)
-  if (glibc_version_less_than("2.27"))
-    return in;
-#endif
-  std::wstring out;
-  unsigned I = 0;
-  bool seen_num_start = false;
-  bool seen_decimal = false;
-  for (; I < in.size(); ++I) {
-    seen_decimal |= in[I] == L',';
-    seen_num_start |= in[I] == '-' || std::iswdigit(in[I]);
-    if (seen_decimal || !seen_num_start || in[I] != L' ') {
-      out.push_back(in[I]);
-      continue;
-    }
-    assert(in[I] == L' ');
-#if defined(_WIN32)
-    out.push_back(L'\u00A0');
-#else
-    out.push_back(L'\u202F');
-#endif
-  }
-  return out;
-#else
-  return in;
-#endif
+  return LocaleHelpers::convert_thousands_sep_fr_FR(in);
 }
 #endif // TEST_HAS_NO_WIDE_CHARACTERS
 
diff --git a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
@@ -9,14 +9,6 @@
 // NetBSD does not support LC_MONETARY at the moment
 // XFAIL: netbsd
 
-// Failure related to GLIBC's use of U00A0 as mon_thousands_sep
-// and U002E as mon_decimal_point.
-// TODO: U00A0 should be investigated.
-// Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16006
-// XFAIL: linux
-
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // REQUIRES: locale.ru_RU.UTF-8
 
 // <locale>
@@ -33,6 +25,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 
+#include "locale_helpers.h"
 #include "platform_support.h" // locale name macros
 
 typedef std::money_put<char, cpp17_output_iterator<char*> > Fn;
@@ -55,7 +48,11 @@
     explicit my_facetw(std::size_t refs = 0)
         : Fw(refs) {}
 };
-#endif
+
+static std::wstring convert_thousands_sep(std::wstring const& in) {
+  return LocaleHelpers::convert_thousands_sep_ru_RU(in);
+}
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
 
 int main(int, char**)
 {
@@ -72,6 +69,7 @@
                           new std::moneypunct_byname<wchar_t, true>(loc_name)));
 #endif
 {
+    std::string symbol = LocaleHelpers::currency_symbol_ru_RU();
     const my_facet f(1);
     // char, national
     {   // zero
@@ -108,7 +106,7 @@
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, '*', v);
         std::string ex(str, iter.base());
-        assert(ex == "0,00 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "0,00 " + symbol);
     }
     {   // negative one, showbase
         long double v = -1;
@@ -116,7 +114,7 @@
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, '*', v);
         std::string ex(str, iter.base());
-        assert(ex == "-0,01 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "-0,01 " + symbol);
     }
     {   // positive, showbase
         long double v = 123456789;
@@ -124,7 +122,7 @@
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, '*', v);
         std::string ex(str, iter.base());
-        assert(ex == "1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "1 234 567,89 " + symbol);
     }
     {   // negative, showbase
         long double v = -123456789;
@@ -132,39 +130,39 @@
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, '*', v);
         std::string ex(str, iter.base());
-        assert(ex == "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "-1 234 567,89 " + symbol);
     }
     {   // negative, showbase, left
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::left(ios);
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, ' ', v);
         std::string ex(str, iter.base());
-        assert(ex == "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "-1 234 567,89 " + symbol);
         assert(ios.width() == 0);
     }
     {   // negative, showbase, internal
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::internal(ios);
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, ' ', v);
         std::string ex(str, iter.base());
-        assert(ex == "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "-1 234 567,89 " + symbol);
         assert(ios.width() == 0);
     }
     {   // negative, showbase, right
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::right(ios);
         char str[100];
         cpp17_output_iterator<char*> iter = f.put(cpp17_output_iterator<char*>(str), false, ios, ' ', v);
         std::string ex(str, iter.base());
-        assert(ex == "-1 234 567,89 \xD1\x80\xD1\x83\xD0\xB1"".");
+        assert(ex == "-1 234 567,89 " + symbol);
         assert(ios.width() == 0);
     }
 
@@ -267,6 +265,7 @@
 }
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 {
+    std::wstring symbol = LocaleHelpers::currency_wsymbol_ru_RU();
     const my_facetw f(1);
     // wchar_t, national
     std::noshowbase(ios);
@@ -290,14 +289,14 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"1 234 567,89");
+        assert(ex == convert_thousands_sep(L"1 234 567,89"));
     }
     {   // negative
         long double v = -123456789;
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89"));
     }
     {   // zero, showbase
         long double v = 0;
@@ -305,7 +304,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"0,00 \x440\x443\x431"".");
+        assert(ex == L"0,00 " + symbol);
     }
     {   // negative one, showbase
         long double v = -1;
@@ -313,7 +312,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-0,01 \x440\x443\x431"".");
+        assert(ex == L"-0,01 " + symbol);
     }
     {   // positive, showbase
         long double v = 123456789;
@@ -321,7 +320,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"1 234 567,89 \x440\x443\x431"".");
+        assert(ex == convert_thousands_sep(L"1 234 567,89 ") + symbol);
     }
     {   // negative, showbase
         long double v = -123456789;
@@ -329,39 +328,39 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89 \x440\x443\x431"".");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 ") + symbol);
     }
     {   // negative, showbase, left
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::left(ios);
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89 \x440\x443\x431"".  ");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 ") + symbol);
         assert(ios.width() == 0);
     }
     {   // negative, showbase, internal
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::internal(ios);
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89   \x440\x443\x431"".");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 ") + symbol);
         assert(ios.width() == 0);
     }
     {   // negative, showbase, right
         long double v = -123456789;
         std::showbase(ios);
-        ios.width(20);
+        ios.width(15);
         std::right(ios);
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), false, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"  -1 234 567,89 \x440\x443\x431"".");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 ") + symbol);
         assert(ios.width() == 0);
     }
 
@@ -387,14 +386,14 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"1 234 567,89");
+        assert(ex == convert_thousands_sep(L"1 234 567,89"));
     }
     {   // negative
         long double v = -123456789;
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89"));
     }
     {   // zero, showbase
         long double v = 0;
@@ -418,7 +417,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"1 234 567,89 RUB");
+        assert(ex == convert_thousands_sep(L"1 234 567,89 RUB"));
     }
     {   // negative, showbase
         long double v = -123456789;
@@ -426,7 +425,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, '*', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89 RUB");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 RUB"));
     }
     {   // negative, showbase, left
         long double v = -123456789;
@@ -436,7 +435,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89 RUB   ");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89 RUB   "));
         assert(ios.width() == 0);
     }
     {   // negative, showbase, internal
@@ -447,7 +446,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"-1 234 567,89    RUB");
+        assert(ex == convert_thousands_sep(L"-1 234 567,89    RUB"));
         assert(ios.width() == 0);
     }
     {   // negative, showbase, right
@@ -458,7 +457,7 @@
         wchar_t str[100];
         cpp17_output_iterator<wchar_t*> iter = f.put(cpp17_output_iterator<wchar_t*>(str), true, ios, ' ', v);
         std::wstring ex(str, iter.base());
-        assert(ex == L"   -1 234 567,89 RUB");
+        assert(ex == convert_thousands_sep(L"   -1 234 567,89 RUB"));
         assert(ios.width() == 0);
     }
 }
diff --git a/libcxx/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp b/libcxx/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.monetary/locale.moneypunct.byname/curr_symbol.pass.cpp
@@ -25,6 +25,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "locale_helpers.h"
 #include "platform_support.h" // locale name macros
 
 class Fnf
@@ -140,19 +141,7 @@
 
     {
         Fnf f(LOCALE_ru_RU_UTF_8, 1);
-#if defined(_CS_GNU_LIBC_VERSION)
-        // GLIBC <= 2.23 uses currency_symbol="<U0440><U0443><U0431>"
-        // GLIBC >= 2.24 uses currency_symbol="<U20BD>"
-        // See also: http://www.fileformat.info/info/unicode/char/20bd/index.htm
-        if (!glibc_version_less_than("2.24"))
-          assert(f.curr_symbol() == " \xE2\x82\xBD"); // \u20BD
-        else
-          assert(f.curr_symbol() == " \xD1\x80\xD1\x83\xD0\xB1"); // \u0440\u0443\u0431
-#elif defined(_WIN32) || defined(__FreeBSD__)
-        assert(f.curr_symbol() == " \xE2\x82\xBD"); // \u20BD
-#else
-        assert(f.curr_symbol() == " \xD1\x80\xD1\x83\xD0\xB1."); // \u0440\u0443\u0431.
-#endif
+        assert(f.curr_symbol() == " " + LocaleHelpers::currency_symbol_ru_RU());
     }
     {
         Fnt f(LOCALE_ru_RU_UTF_8, 1);
@@ -161,16 +150,7 @@
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
     {
         Fwf f(LOCALE_ru_RU_UTF_8, 1);
-#if defined(_CS_GNU_LIBC_VERSION)
-        if (!glibc_version_less_than("2.24"))
-          assert(f.curr_symbol() == L" \u20BD");
-        else
-          assert(f.curr_symbol() == L" \u0440\u0443\u0431");
-#elif defined(_WIN32) || defined(__FreeBSD__)
-        assert(f.curr_symbol() == L" \u20BD");
-#else
-        assert(f.curr_symbol() == L" \u0440\u0443\u0431.");
-#endif
+        assert(f.curr_symbol() == L" " + LocaleHelpers::currency_wsymbol_ru_RU());
     }
 
     {
diff --git a/libcxx/test/support/locale_helpers.h b/libcxx/test/support/locale_helpers.h
new file mode 100644
--- /dev/null
+++ b/libcxx/test/support/locale_helpers.h
@@ -0,0 +1,112 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LIBCXX_TEST_SUPPORT_LOCALE_HELPERS_H
+#define LIBCXX_TEST_SUPPORT_LOCALE_HELPERS_H
+
+#include <string>
+#include "platform_support.h"
+#include "test_macros.h"
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+
+#include <cwctype>
+
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
+
+namespace LocaleHelpers {
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+
+std::wstring convert_thousands_sep(std::wstring const& in, wchar_t sep) {
+  std::wstring out;
+  bool seen_num_start = false;
+  bool seen_decimal = false;
+  for (unsigned i = 0; i < in.size(); ++i) {
+    seen_decimal |= in[i] == L',';
+    seen_num_start |= in[i] == L'-' || std::iswdigit(in[i]);
+    if (seen_decimal || !seen_num_start || in[i] != L' ') {
+      out.push_back(in[i]);
+      continue;
+    }
+    assert(in[i] == L' ');
+    out.push_back(sep);
+  }
+  return out;
+}
+
+// GLIBC 2.27 and newer use U+202F NARROW NO-BREAK SPACE as a thousands separator.
+// This function converts the spaces in string inputs to U+202F if need
+// be. FreeBSD's locale data also uses U+202F, since 2018.
+// Windows uses U+00A0 NO-BREAK SPACE.
+std::wstring convert_thousands_sep_fr_FR(std::wstring const& in) {
+#if defined(_CS_GNU_LIBC_VERSION) || defined(__FreeBSD__)
+#if defined(_CS_GNU_LIBC_VERSION)
+  if (glibc_version_less_than("2.27"))
+    return in;
+#endif
+  return convert_thousands_sep(in, L'\u202F');
+#elif defined(_WIN32)
+  return convert_thousands_sep(in, L'\u00A0');
+#else
+  return in;
+#endif
+}
+
+// GLIBC 2.27 uses U+202F NARROW NO-BREAK SPACE as a thousands separator.
+// FreeBSD and Windows use U+00A0 NO-BREAK SPACE.
+std::wstring convert_thousands_sep_ru_RU(std::wstring const& in) {
+#if defined(TEST_HAS_GLIBC)
+  return convert_thousands_sep(in, L'\u202F');
+#elif defined(__FreeBSD__) || defined(_WIN32)
+  return convert_thousands_sep(in, L'\u00A0');
+#else
+  return in;
+#endif
+}
+
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
+
+std::string currency_symbol_ru_RU() {
+#if defined(_CS_GNU_LIBC_VERSION)
+  // GLIBC <= 2.23 uses currency_symbol="<U0440><U0443><U0431>"
+  // GLIBC >= 2.24 uses currency_symbol="<U20BD>"
+  // See also: http://www.fileformat.info/info/unicode/char/20bd/index.htm
+  if (!glibc_version_less_than("2.24"))
+    return "\u20BD";
+  else
+    return "\u0440\u0443\u0431";
+#elif defined(_WIN32) || defined(__FreeBSD__)
+  return "\u20BD";
+#else
+  return "\u0440\u0443\u0431.";
+#endif
+}
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+
+std::wstring currency_wsymbol_ru_RU() {
+#if defined(_CS_GNU_LIBC_VERSION)
+  // GLIBC <= 2.23 uses currency_symbol="<U0440><U0443><U0431>"
+  // GLIBC >= 2.24 uses currency_symbol="<U20BD>"
+  // See also: http://www.fileformat.info/info/unicode/char/20bd/index.htm
+  if (!glibc_version_less_than("2.24"))
+    return L"\u20BD";
+  else
+    return L"\u0440\u0443\u0431";
+#elif defined(_WIN32) || defined(__FreeBSD__)
+  return L"\u20BD";
+#else
+  return L"\u0440\u0443\u0431.";
+#endif
+}
+
+#endif // TEST_HAS_NO_WIDE_CHARACTERS
+
+} // namespace LocaleHelpers
+
+#endif // LIBCXX_TEST_SUPPORT_LOCALE_HELPERS_H