diff options
Diffstat (limited to 'absl/strings/internal/str_format/convert_test.cc')
| -rw-r--r-- | absl/strings/internal/str_format/convert_test.cc | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/absl/strings/internal/str_format/convert_test.cc b/absl/strings/internal/str_format/convert_test.cc index dd167f76e68f..20c6229fcb37 100644 --- a/absl/strings/internal/str_format/convert_test.cc +++ b/absl/strings/internal/str_format/convert_test.cc @@ -704,6 +704,31 @@ TEST_F(FormatConvertTest, FloatRound) { "1837869002408041296803276054561138153076171875"); } +// We don't actually store the results. This is just to exercise the rest of the +// machinery. +struct NullSink { + friend void AbslFormatFlush(NullSink *sink, string_view str) {} +}; + +template <typename... T> +bool FormatWithNullSink(absl::string_view fmt, const T &... a) { + NullSink sink; + FormatArgImpl args[] = {FormatArgImpl(a)...}; + return FormatUntyped(&sink, UntypedFormatSpecImpl(fmt), absl::MakeSpan(args)); +} + +TEST_F(FormatConvertTest, ExtremeWidthPrecision) { + for (const char *fmt : {"f"}) { + for (double d : {1e-100, 1.0, 1e100}) { + constexpr int max = std::numeric_limits<int>::max(); + EXPECT_TRUE(FormatWithNullSink(std::string("%.*") + fmt, max, d)); + EXPECT_TRUE(FormatWithNullSink(std::string("%1.*") + fmt, max, d)); + EXPECT_TRUE(FormatWithNullSink(std::string("%*") + fmt, max, d)); + EXPECT_TRUE(FormatWithNullSink(std::string("%*.*") + fmt, max, max, d)); + } + } +} + TEST_F(FormatConvertTest, LongDouble) { #ifdef _MSC_VER // MSVC has a different rounding policy than us so we can't test our |