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import TestPilot from require 'spec.test_setup'
import T, Struct, Array, Constant from require 'alv'
describe "do", ->
COPILOT = TestPilot ''
it "can be empty", ->
rt = COPILOT\eval_once '(do)'
assert.is.true rt\is_const!
assert.is.nil rt.result
it "returns the last result, if any", ->
rt = COPILOT\eval_once '(do 1 2 3)'
assert.is.true rt\is_const!
assert.is.equal (Constant.num 3), rt.result
rt = COPILOT\eval_once '(do 1 2 (trace 3))'
assert.is.true rt\is_const!
assert.is.nil rt.result
it "passes through side-effects", ->
rt = COPILOT\eval_once '
(import* time)
(do
(every 0.5 "bang! side-effect")
3)'
assert.is.false rt\is_const!
assert.is.equal (Constant.num 3), rt.result
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