setup

test true is a boolean
test not (true is not a boolean)

test false is a boolean
test "true" is a boolean
test "false" is a boolean

test "False" is a boolean
test "FALSE" is a boolean
test "fAlSe" is a boolean
test "tRuE" is a boolean

test "abc" is not a boolean
test 1 is not a boolean
test 1.23 is not a boolean

test empty is not a boolean

teardown
