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BITFIELD: overflow wrap behavior fuzz tester.

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This commit is contained in:
antirez 2016-03-02 17:22:42 +01:00
parent ae7317e8e9
commit 28c291c55c
1 changed files with 51 additions and 0 deletions
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51
tests/unit/bitfield.tcl
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@ -97,6 +97,7 @@ start_server {tags {"bitops"}} {
set type "u$bits" set type "u$bits"
} }
set max [expr {$min+$range-1}] set max [expr {$min+$range-1}]
# Compare Tcl vs Redis # Compare Tcl vs Redis
set range2 [expr {$range*2}] set range2 [expr {$range*2}]
set value [expr {($min*2)+[randomInt $range2]}] set value [expr {($min*2)+[randomInt $range2]}]
@ -133,4 +134,54 @@ start_server {tags {"bitops"}} {
} }
} }
} }
test {BITFIELD overflow wrap fuzzing} {
for {set j 0} {$j < 1000} {incr j} {
set bits [expr {[randomInt 64]+1}]
set sign [randomInt 2]
set range [expr {2**$bits}]
if {$bits == 64} {set sign 1} ; # u64 is not supported by BITFIELD.
if {$sign} {
set min [expr {-($range/2)}]
set type "i$bits"
} else {
set min 0
set type "u$bits"
}
set max [expr {$min+$range-1}]
# Compare Tcl vs Redis
set range2 [expr {$range*2}]
set value [expr {($min*2)+[randomInt $range2]}]
set increment [expr {($min*2)+[randomInt $range2]}]
if {$value > 9223372036854775807} {
set value 9223372036854775807
}
if {$value < -9223372036854775808} {
set value -9223372036854775808
}
if {$increment > 9223372036854775807} {
set increment 9223372036854775807
}
if {$increment < -9223372036854775808} {
set increment -9223372036854775808
}
r del bits
r bitfield bits overflow wrap set $type 0 $value
r bitfield bits overflow wrap incrby $type 0 $increment
set res [lindex [r bitfield bits get $type 0] 0]
set expected 0
if {$sign} {incr expected [expr {$max+1}]}
incr expected $value
incr expected $increment
set expected [expr {$expected % $range}]
if {$sign} {incr expected $min}
if {$res != $expected} {
fail "WRAP error: $type $value+$increment = $res, should be $expected"
}
}
}
} }