Workaround hexfloat inconsistency on windows (#2205)

Author: vitaut

test/format-test.cc

@@ -46,6 +46,7 @@ using fmt::wmemory_buffer;
 using fmt::wstring_view;
 using fmt::detail::max_value;
 
+using testing::Contains;
 using testing::Return;
 using testing::StrictMock;
 
@@ -224,7 +225,8 @@ TEST(BufferAppenderTest, BufferAppenderDefaultConstruct) {
   static_assert(
       std::is_default_constructible<
           std::back_insert_iterator<fmt::detail::buffer<char>>>::value ==
-      std::is_default_constructible<fmt::detail::buffer_appender<char>>::value,
+          std::is_default_constructible<
+              fmt::detail::buffer_appender<char>>::value,
       "");
 }
 
@@ -994,7 +996,8 @@ TEST(FormatterTest, Precision) {
       "012970999954193198940908041656332452475714786901472678015935523861155013"
       "480352649347201937902681071074917033322268447533357208324319361e-324",
       format("{:.494}", 4.9406564584124654E-324));
-  EXPECT_EQ(
+
+  std::string outputs[] = {
       "-0X1.41FE3FFE71C9E000000000000000000000000000000000000000000000000000000"
       "000000000000000000000000000000000000000000000000000000000000000000000000"
       "000000000000000000000000000000000000000000000000000000000000000000000000"
@@ -1007,7 +1010,20 @@ TEST(FormatterTest, Precision) {
       "000000000000000000000000000000000000000000000000000000000000000000000000"
       "000000000000000000000000000000000000000000000000000000000000000000000000"
       "000000000000000000000000000000000000000000000000000P+127",
-      format("{:.838A}", -2.14001164E+38));
+      "-0XA.0FF1FFF38E4F0000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000000000000000000000000"
+      "000000000000000000000000000000000000000000000000000P+124"};
+  EXPECT_THAT(outputs, Contains(format("{:.838A}", -2.14001164E+38)));
+
   EXPECT_EQ("123.", format("{:#.0f}", 123.0));
   EXPECT_EQ("1.23", format("{:.02f}", 1.234));
   EXPECT_EQ("0.001", format("{:.1g}", 0.001));