procps/testsuite/free.test/free.exp

#
# Testsuite for free program
#

set free "${topdir}free"
set meminfo [ exec cat /proc/meminfo ]
regexp "MemTotal:\\s+\(\\d+\)" $meminfo -> memtotal_kb
regexp "SwapTotal:\\s+\(\\d+\)" $meminfo -> swaptotal_kb

set free_header "\\s+total\\s+used\\s+free\\s+shared\\s+buff\\/cache\\s+available\\s*"

set test "free with no arguments"
spawn $free
expect_pass "$test" "^${free_header}Mem:\\s+${memtotal_kb}\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s*Swap:\\s+${swaptotal_kb}\\s+\\d+\\s+\\d+\\s*"

set test "free with -b argument"
set memtotal [ expr { $memtotal_kb * 1024 } ]
set swaptotal [ expr { $swaptotal_kb * 1024 } ]
spawn $free -b
expect_pass "$test" "^${free_header}Mem:\\s+${memtotal}\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s*Swap:\\s+${swaptotal}\\s+\\d+\\s+\\d+\\s*"

foreach {arg divisor } {-k 1 -m 1024 -g 1048576 } {
    set test "free with $arg argument"
    set memtotal [ expr { $memtotal_kb / $divisor } ]
    set swaptotal [ expr { $swaptotal_kb / $divisor } ]
    spawn $free $arg
    expect_pass "$test"  "^${free_header}Mem:\\s+$memtotal\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s*Swap:\\s+${swaptotal}\\s+\\d+\\s+\\d+\\s*"
}

#set test "free with human readable output"
#spawn $free -h
#expect_pass "$test" "${free_header}Mem:\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s*-\\/\\+ buffers\\/cache:\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s*Swap:\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s+\[0-9.\]+\[BKMGT\]\\s*"

set test "free with lo and hi memory statistics"
spawn $free -l
expect_pass "$test" "^${free_header}Mem:\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s*Low:\\s+\\d+\\s+\\d+\\s+\\d+\\s*High:\\s+\\d+\\s+\\d+\\s+\\d+\\s*Swap:\\s+\\d+\\s+\\d+\\s+\\d+"

set test "free with total"
spawn $free -t
expect_pass "$test" "^${free_header}Mem:\\s+${memtotal_kb}\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s+\\d+\\s*Swap:\\s+${swaptotal_kb}\\s+\\d+\\s+\\d+\\s*Total:\\s+\\d+\\s+\\d+\\s+\\d+\\s*"

set test "free with negative repeat count"
spawn $free -c -2
expect_pass "$test" "\(lt-\)\?free: failed to parse count argument: '-2': Numerical result out of range"

set test "free with zero repeat count"
spawn $free -c 0
expect_pass "$test" "\(lt-\)\?free: failed to parse count argument: '0': Numerical result out of range"

set test "free with positive repeat count"
spawn $free -c 2
expect_continue "$test" "^${free_header}"
expect_pass "$test" "${free_header}"