Add roundtrip and more tests to ParseISO8601DateTime and FormatISO8601DateTime

Author: elichai

src/test/util_tests.cpp

@@ -145,9 +145,17 @@ BOOST_AUTO_TEST_CASE(util_Join)
     BOOST_CHECK_EQUAL(Join<std::string>({"foo", "bar"}, ", ", op_upper), "FOO, BAR");
 }
 
-BOOST_AUTO_TEST_CASE(util_FormatISO8601DateTime)
+BOOST_AUTO_TEST_CASE(util_FormatParseISO8601DateTime)
 {
     BOOST_CHECK_EQUAL(FormatISO8601DateTime(1317425777), "2011-09-30T23:36:17Z");
+    BOOST_CHECK_EQUAL(FormatISO8601DateTime(0), "1970-01-01T00:00:00Z");
+
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1970-01-01T00:00:00Z"), 0);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1960-01-01T00:00:00Z"), 0);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("2011-09-30T23:36:17Z"), 1317425777);
+
+    auto time = GetSystemTimeInSeconds();
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime(FormatISO8601DateTime(time)), time);
 }
 
 BOOST_AUTO_TEST_CASE(util_FormatISO8601Date)