From 2a7f8054a35fb6094830e985c5cc959c765cca55 Mon Sep 17 00:00:00 2001
From: toh <toh@ableton.com>
Date: Thu, 6 Mar 2025 11:43:00 +0100
Subject: [PATCH] Add test case for #3351 (wrong GMT offset in SunOS/Solaris
 fallback)

---
 tests/test_pattern_formatter.cpp | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tests/test_pattern_formatter.cpp b/tests/test_pattern_formatter.cpp
index d248e996..52b3baf3 100644
--- a/tests/test_pattern_formatter.cpp
+++ b/tests/test_pattern_formatter.cpp
@@ -1,6 +1,8 @@
 #include "includes.h"
 #include "test_sink.h"
 
+#include <chrono>
+
 using spdlog::memory_buf_t;
 using spdlog::details::to_string_view;
 
@@ -19,6 +21,21 @@ static std::string log_to_str(const std::string &msg, const Args &...args) {
     return oss.str();
 }
 
+// log to str and return it
+template <typename... Args>
+static std::string log_to_str(spdlog::log_clock::time_point log_time, const std::string &msg, const Args &...args) {
+    std::ostringstream oss;
+    auto oss_sink = std::make_shared<spdlog::sinks::ostream_sink_mt>(oss);
+    spdlog::logger oss_logger("pattern_tester", oss_sink);
+    oss_logger.set_level(spdlog::level::info);
+
+    oss_logger.set_formatter(
+        std::unique_ptr<spdlog::formatter>(new spdlog::pattern_formatter(args...)));
+
+    oss_logger.log(log_time, {}, spdlog::level::info, msg);
+    return oss.str();
+}
+
 TEST_CASE("custom eol", "[pattern_formatter]") {
     std::string msg = "Hello custom eol test";
     std::string eol = ";)";
@@ -58,6 +75,15 @@ TEST_CASE("date MM/DD/YY ", "[pattern_formatter]") {
             oss.str());
 }
 
+TEST_CASE("GMT offset ", "[pattern_formatter]") {
+    using namespace std::chrono_literals;
+    const auto now = std::chrono::system_clock::now();
+    const auto yesterday = now - 24h;
+
+    REQUIRE(log_to_str(yesterday, "Some message", "%z", spdlog::pattern_time_type::utc) ==
+            "+00:00\n");
+}
+
 TEST_CASE("color range test1", "[pattern_formatter]") {
     auto formatter = std::make_shared<spdlog::pattern_formatter>(
         "%^%v%$", spdlog::pattern_time_type::local, "\n");