test/time: add test for LocalTime(), GmTime()

test/time/TestConvert.cxx

+/*
+ * Copyright 2020 Max Kellermann <max.kellermann@gmail.com>
+ * All rights reserved.
+ *
+ * author: Max Kellermann <mk@cm4all.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "time/Convert.hxx"
+
+#include <gtest/gtest.h>
+
+static constexpr time_t times[] = {
+	1234567890,
+	1580566807,
+	1585750807,
+	1590934807,
+};
+
+TEST(Time, LocalTime)
+{
+	/* convert back and forth using local time zone */
+
+	for (const auto t : times) {
+		auto tp = std::chrono::system_clock::from_time_t(t);
+		auto tm = LocalTime(tp);
+		EXPECT_EQ(MakeTime(tm), tp);
+	}
+}
+
+TEST(Time, GmTime)
+{
+	/* convert back and forth using UTC */
+
+	for (const auto t : times) {
+		auto tp = std::chrono::system_clock::from_time_t(t);
+		auto tm = GmTime(tp);
+		EXPECT_EQ(std::chrono::system_clock::to_time_t(TimeGm(tm)),
+			  t);
+	}
+}

test/time/meson.build

 test_time_sources = [
+  'TestConvert.cxx',
   'TestISO8601.cxx',
 ]