1 files changed, 120 insertions, 0 deletions
diff --git a/contrib/bmake/unit-tests/varmod-mtime.mk b/contrib/bmake/unit-tests/varmod-mtime.mk
new file mode 100644
index 000000000000..aed7024efd6b
--- /dev/null
+++ b/contrib/bmake/unit-tests/varmod-mtime.mk
@@ -0,0 +1,120 @@
+# $NetBSD: varmod-mtime.mk,v 1.17 2025/06/28 22:39:29 rillig Exp $
+#
+# Tests for the ':mtime' variable modifier, which maps each word of the
+# expression to that file's modification time.
+
+# Note: strftime() uses mktime() for %s and mktime() assumes localtime
+# so this should match time()
+start:=	${%s:L:localtime}	# see varmod-gmtime.mk, keyword '%s'
+
+
+# Ensure that this makefile exists and has a modification time.  If the file
+# didn't exist, the ':mtime' modifier would return the current time.
+.if ${MAKEFILE:mtime} >= ${start}
+.  error
+.endif
+
+
+# For a file that doesn't exist, the ':mtime' modifier returns the current
+# time, without an error or warning message.  The returned timestamp differs
+# from the 'now' that is used when updating the timestamps in archives or for
+# touching files using the '-t' option, which is taken once when make is
+# started.
+not_found_mtime:=	${no/such/file:L:mtime}
+.if ${not_found_mtime} < ${start}
+.  error
+.endif
+
+
+# The ':mtime' modifier accepts a timestamp in seconds as an optional
+# argument.  This timestamp is used as a fallback in case the file's time
+# cannot be determined, without any error or warning message.
+.if ${no/such/file:L:mtime=0} != "0"
+.  error
+.endif
+
+
+# The fallback timestamp must start with a digit, and it is interpreted as a
+# decimal integer.
+.if ${no/such/file:L:mtime=00042} != "42"
+.  error
+.endif
+
+
+# The fallback timestamp must only be an integer, without trailing characters.
+# expect+1: Invalid argument "123x" for modifier ":mtime"
+.if ${no/such/file:L:mtime=123x}
+.  error
+.else
+.  error
+.endif
+
+
+# The timestamp of a newly created file must be at least as great as the
+# timestamp when parsing of this makefile started.
+COOKIE=	${TMPDIR:U/tmp}/varmod-mtime.cookie
+_!=	touch ${COOKIE}
+.if ${COOKIE:mtime=0} < ${start}
+.   error ${COOKIE:mtime=0} < ${start}
+.endif
+_!=	rm -f ${COOKIE}
+
+
+# If the optional argument of the ':mtime' modifier is the word 'error', the
+# modifier fails with an error message, once for each affected file.
+#
+# expect+2: Cannot determine mtime for "no/such/file1": <ENOENT>
+# expect+1: Cannot determine mtime for "no/such/file2": <ENOENT>
+.if ${no/such/file1 no/such/file2:L:mtime=error}
+.  error
+.else
+.  error
+.endif
+
+
+# Only the word 'error' is a special argument to the ':mtime' modifier, all
+# other words result in a parse error.
+# expect+1: Invalid argument "errorhandler-no" for modifier ":mtime"
+.if ${MAKEFILE:mtime=errorhandler-no} > 0
+.else
+.  error
+.endif
+
+
+# Only the word 'error' can be used as a fallback argument to the modifier.
+# expect+1: Invalid argument "warn" for modifier ":mtime"
+.if ${MAKEFILE:mtime=warn} > 0
+.  error
+.else
+.  error
+.endif
+
+
+# Ensure that the fallback for a missing modification time is indeed the
+# current time, and not any later time.
+end:=	${%s:L:gmtime}
+.if ${not_found_mtime} > ${end}
+.  error
+.endif
+
+
+# If the expression is irrelevant, the ':mtime' modifier is only parsed, it
+# does not perform any filesystem operations.
+.if 0 && ${no/such/file:L:mtime=error}
+.  error
+.endif
+
+
+# If there is a typo in the modifier name, it does not match.
+# expect+1: Unknown modifier ":mtim"
+.if ${anything:L:mtim}
+.  error
+.else
+.  error
+.endif
+
+
+# An empty word list results in an empty mtime list.
+.if ${:U:mtime} != ""
+.  error
+.endif