sprint2

test.js
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			var tape = require('tape')
			var genfun = require('./')

			tape('generate add function', function(t) {
			var fn = genfun()
			('function add(n) {')
			('return n + %d', 42)
			('}')

			t.same(fn.toString(), 'function add(n) {\n return n + 42\n}', 'code is indented')
			t.same(fn.toFunction()(10), 52, 'function works')
			t.end()
			})

			tape('generate function + closed variables', function(t) {
			var fn = genfun()
			('function add(n) {')
			('return n + %d + number', 42)
			('}')

			var notGood = fn.toFunction()
			var good = fn.toFunction({number:10})

			try {
			notGood(10)
			t.ok(false, 'function should not work')
			} catch (err) {
			t.same(err.message, 'number is not defined', 'throws reference error')
			}

			t.same(good(11), 63, 'function with closed var works')
			t.end()
			})