patch 8.1.1567: localtime_r() does not respond to $TZ changes
Problem: Localtime_r() does not respond to $TZ changes.
Solution: If $TZ changes then call tzset(). (Tom Ryder)
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index a2e4da6..f71717f 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -187,6 +187,30 @@
call assert_fails('call strftime([])', 'E730:')
call assert_fails('call strftime("%Y", [])', 'E745:')
+
+ " Check that the time changes after we change the timezone
+ " Save previous timezone value, if any
+ if exists('$TZ')
+ let tz = $TZ
+ endif
+
+ " Force EST and then UTC, save the current hour (24-hour clock) for each
+ let $TZ = 'EST' | let est = strftime('%H')
+ let $TZ = 'UTC' | let utc = strftime('%H')
+
+ " Those hours should be two bytes long, and should not be the same; if they
+ " are, a tzset(3) call may have failed somewhere
+ call assert_equal(strlen(est), 2)
+ call assert_equal(strlen(utc), 2)
+ call assert_notequal(est, utc)
+
+ " If we cached a timezone value, put it back, otherwise clear it
+ if exists('tz')
+ let $TZ = tz
+ else
+ unlet $TZ
+ endif
+
endfunc
func Test_resolve_unix()