49 lines
2.0 KiB
CoffeeScript
49 lines
2.0 KiB
CoffeeScript
chai = require 'chai'
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chai.should()
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expect = chai.expect
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{cons} = require "cons-lists/lists"
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lisp = require '../chapter1/interpreter'
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{read, readForms} = require '../chapter1/reader'
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the_false_value = (cons "false", "boolean")
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describe "Core interpreter #1", ->
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it "Should handle true statements", ->
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expect(lisp read "(begin (if (lt 0 1) #t #f))").to.equal(true)
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it "Should handle false statements", ->
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expect(lisp read "(begin (if (lt 1 0) #t #f))").to.deep.equal(the_false_value)
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it "Should handle return strings", ->
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expect(lisp read '(begin (if (lt 0 1) "y" "n"))').to.equal("y")
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it "Should handle return strings when false", ->
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expect(lisp read '(begin (if (lt 1 0) "y" "n"))').to.equal("n")
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it "Should handle equivalent objects that are not intrinsically truthy", ->
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expect(lisp read '(begin (if (eq? "y" "y") "y" "n"))').to.equal("y")
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it "Should handle inequivalent objects that are not intrinsically truthy", ->
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expect(lisp read '(begin (if (eq? "y" "x") "y" "n"))').to.equal("n")
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it "Should handle basic arithmetic", ->
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expect(lisp read '(begin (+ 5 5))').to.equal(10)
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expect(lisp read '(begin (* 5 5))').to.equal(25)
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expect(lisp read '(begin (/ 5 5))').to.equal(1)
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expect(lisp read '(begin (- 9 5))').to.equal(4)
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it "Should handle some algebra", ->
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expect(lisp read '(begin (* (+ 5 5) (* 2 3)))').to.equal(60)
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it "Should handle a basic setting", ->
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expect(lisp read '(begin (set! fact 4) fact)').to.equal(4)
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it "Should handle a zero arity thunk", ->
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expect(lisp read '(begin (set! fact (lambda () (+ 5 5))) (fact))').to.equal(10)
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it "Should handle a two arity thunk", ->
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expect(lisp read '(begin (set! fact (lambda (a b) (+ a b))) (fact 4 6))').to.equal(10)
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it "Should handle a recursive function", ->
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expect(lisp read '(begin (set! fact (lambda (x) (if (eq? x 0) 1 (* x (fact (- x 1)))))) (fact 5))').to.equal(120)
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it "Should handle an IIFE", ->
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expect(lisp read '(begin ((lambda () (+ 5 5))))').to.equal(10)
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