$ source assert.bash
$ assert "str_val" "str_val"     # string comparison
OK
$ assert "str_val" "str_val2"    # if assertion failure, show arguments.
ERR str_val str_val2
$ assert 2 -gt 1                 # numeric comparison
OK
$ assert 2 -lt 1
ERR 2 -lt 1
$ assert "str_val" match val$    # regexp
OK
$ assert "str_val" match ^val
ERR str_val match ^val
$ asseret -f exits.txt           # file exists
OK
$ asseret -d nothing/dir         # directory exists
ERR -d nothing/dir
$ assert same.txt cmp same.txt   # file contents equal
OK
$ assert same.txt cmp diff.txt
ERR same.txt cmp diff.txt
$ assert same.txt !cmp diff.txt  # file contents not equal
OK
$ assert same.txt !cmp same.txt
ERR same.txt cmp same.txt