From 2e3352fd051e791a452e93a3f85de2e734e11734 Mon Sep 17 00:00:00 2001
From: Paul Dreik <github@pauldreik.se>
Date: Sun, 28 Apr 2019 21:34:09 +0200
Subject: [PATCH] provoke assertion

fmt/include/fmt/core.h:246:
typename std::make_unsigned<_Tp>::type fmt::v5::internal::to_unsigned(Int)
[with Int = long int;
 typename std::make_unsigned<_Tp>::type = long unsigned int]:
Assertion `(value >= 0) && "negative value"' failed.
---
 test/chrono-test.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/chrono-test.cc b/test/chrono-test.cc
index 40d34235..76d93fbf 100644
--- a/test/chrono-test.cc
+++ b/test/chrono-test.cc
@@ -296,4 +296,13 @@ TEST(ChronoTest, FormatFullSpecsQq) {
   EXPECT_EQ("*1.2340 ms*", fmt::format("{:*^11.4%Q %q}", dms(1.234)));
 }
 
+TEST(ChronoTest, InvalidWidthId) {
+  EXPECT_THROW(fmt::format("{:{o}", std::chrono::seconds(0)),
+               fmt::format_error);
+}
+
+TEST(ChronoTest, InvalidColons) {
+  EXPECT_THROW(fmt::format("{0}=:{0::", std::chrono::seconds(0)),
+               fmt::format_error);
+}
 #endif  // FMT_STATIC_THOUSANDS_SEPARATOR