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import TestPilot from require 'spec.test_setup'
import T, Struct, Array, Constant from require 'alv'
describe "function", ->
COPILOT = TestPilot!
it "returns constant results when constant", ->
rt = COPILOT\eval_once '
(import* math)
(defn my-plus [a b]
(+ a b))
(my-plus 2 3)'
assert.is.true rt\is_const!
assert.is.equal (Constant.num 5), rt.result
it "can have empty arguments", ->
rt = COPILOT\eval_once '
(import* math)
(defn my-plus []
(+ 1 2))
(my-plus)'
assert.is.equal (Constant.num 3), rt.result
it "checks argument arity when invoked", ->
err = assert.has.error -> COPILOT\eval_once '
([1]import* math)
([2]defn my-plus [a b]
([4]+ a b))
([3]my-plus 2)'
assert.matches "argument error: expected 2 arguments, found 1", err
assert.matches "while invoking function 'my%-plus' at %[3%]", err
err = assert.has.error -> COPILOT\eval_once '
([1]import* math)
([2]defn my-plus [a b]
([4]+ a b))
([3]my-plus 2 3 4)'
assert.matches "argument error: expected 2 arguments, found 3", err
assert.matches "while invoking function 'my%-plus' at %[3%]", err
it "can be anonymously invoked", ->
rt = COPILOT\eval_once '
([1]
([2]fn [a b] b)
3 4)'
assert.is.equal (Constant.num 4), rt\const!
err = assert.has.error -> COPILOT\eval_once '
([1]
([2]fn [a b] b)
3)'
assert.matches "argument error: expected 2 arguments, found 1", err
assert.matches "while invoking function %(unnamed%) at %[1%]", err
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