[test] Tests for 'block' and 'return' added. All tests passing. W00t!

test/test_chapter3-cont.coffee

@@ -0,0 +1,34 @@
+chai = require 'chai'
+chai.should()
+expect = chai.expect
+
+{cons} = require "cons-lists/lists"
+olisp = require '../chapter3/interpreter'
+{read, readForms} = require '../chapter1/reader'
+
+the_false_value = (cons "false", "boolean")
+
+lisp = (ast) ->
+  ret = undefined
+  olisp ast, (i) -> ret = i
+  return ret
+
+describe "Core interpreter #3: Blocks", ->
+  it "Should handle simple blocks", ->
+    expect(lisp read "(block foo 33)").to.equal(33)
+  it "Should handle the last blocks", ->
+    expect(lisp read "(block foo 1 2 3)").to.equal(3)
+  it "Should handle expressive blocks", ->
+    expect(lisp read "(block foo (+ 5 5))").to.equal(10)
+  it "Should handle basic returns blocks", ->
+    expect(lisp read "(block foo (+ 1 (return-from foo 2)))").to.equal(2)
+  it "Should handle complex returns blocks", ->
+    expect(lisp read "(block foo ((lambda (exit)(* 2 (block foo (* 3 (exit 5)) )) ) (lambda (x) (return-from foo x)) ) )").to.equal(5)
+  it "Expects an uninitialized return-from to fail", ->
+    expect(-> lisp read "(return-from foo 3)").to.throw("Unknown block label foo")
+  it "Expects to see an obsolete block when called late", ->
+    expect(-> lisp read "((block foo (lambda (x) (return-from foo x))) 3 )").to.throw("Obsolete continuation")
+  it "Expects to see an obsolete block when called late", ->
+    expect(-> lisp read "((block a  (* 2 (block b (return-from a (lambda (x) (return-from b x))))) )3 )").to.throw("Obsolete continuation")
+  it "Expects to see an obsolete block when called late", ->
+    expect(-> lisp read "((block a (* 2 (block b (return-from a (lambda (x) (return-from a x))))) ) 3 )").to.throw("Obsolete continuation")