Tests: Times: JS: Add test for yearday attribute.

tests/js/ttimes.nim

@@ -0,0 +1,13 @@
+# test times module with js
+discard """
+  action: run
+"""
+
+import times
+
+# $ date --date='@2147483647'
+# Tue 19 Jan 03:14:07 GMT 2038
+
+block yeardayTest:
+  # check if yearday attribute is properly set on TimeInfo creation
+  doAssert fromSeconds(2147483647).getGMTime().yearday == 0