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# $NetBSD: varmod-order-shuffle.mk,v 1.8 2023/02/26 06:08:06 rillig Exp $
#
# Tests for the :Ox variable modifier, which returns the words of the
# variable, shuffled.
#
# The variable modifier :Ox is available since 2005-06-01.
#
# As of 2020-08-16, make uses random(3) seeded by the current time in seconds.
# This makes the random numbers completely predictable since the only other
# part of make that uses random numbers is the 'randomize-targets' mode, which
# is off by default.
#
# Tags: probabilistic
WORDS= one two three four five six seven eight nine ten
# Note that 1 in every 10! trials two independently generated
# randomized orderings will be the same. The test framework doesn't
# support checking probabilistic output, so we accept that each of the
# 3 :Ox tests will incorrectly fail with probability 2.756E-7, which
# lets the whole test fail once in 1.209.600 runs, on average.
# Create two shuffles using the := assignment operator.
shuffled1:= ${WORDS:Ox}
shuffled2:= ${WORDS:Ox}
.if ${shuffled1} == ${shuffled2}
. error ${shuffled1} == ${shuffled2}
.endif
# Sorting the list before shuffling it has no effect.
shuffled1:= ${WORDS:O:Ox}
shuffled2:= ${WORDS:O:Ox}
.if ${shuffled1} == ${shuffled2}
. error ${shuffled1} == ${shuffled2}
.endif
# Sorting after shuffling must produce the original numbers.
sorted:= ${WORDS:Ox:O}
.if ${sorted} != ${WORDS:O}
. error ${sorted} != ${WORDS:O}
.endif
all:
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