thedesk/app/node_modules/for-each/test/test.js

var test = require("tape")
    , forEach = require("..")

test("forEach calls each iterator", function (t) {
    var count = 0
    t.plan(4)
    forEach({ a: 1, b: 2 }, function (value, key) {
        if (count === 0) {
            t.equal(value, 1)
            t.equal(key, "a")
        } else {
            t.equal(value, 2)
            t.equal(key, "b")
        }
        count++
    })
})

test("forEach calls iterator with correct this value", function (t) {
    var thisValue = {}

    t.plan(1)

    forEach([0], function () {
        t.equal(this, thisValue)
    }, thisValue)
})

test('second argument: iterator', function (t) {
    var arr = []
    t.throws(function () { forEach(arr) }, TypeError, 'undefined is not a function')
    t.throws(function () { forEach(arr, null) }, TypeError, 'null is not a function')
    t.throws(function () { forEach(arr, '') }, TypeError, 'string is not a function')
    t.throws(function () { forEach(arr, /a/) }, TypeError, 'regex is not a function')
    t.throws(function () { forEach(arr, true) }, TypeError, 'true is not a function')
    t.throws(function () { forEach(arr, false) }, TypeError, 'false is not a function')
    t.throws(function () { forEach(arr, NaN) }, TypeError, 'NaN is not a function')
    t.throws(function () { forEach(arr, 42) }, TypeError, '42 is not a function')
    t.doesNotThrow(function () { forEach(arr, function () {}) }, 'function is a function')
    t.doesNotThrow(function () { forEach(arr, setTimeout) }, 'setTimeout is a function')
    if (typeof window !== 'undefined') {
        t.doesNotThrow(function () { forEach(arr, window.alert) }, 'alert is a function')
    }
    t.end()
})

test('array', function (t) {
    var arr = [1, 2, 3]

    t.test('iterates over every item', function (st) {
        var index = 0
        forEach(arr, function () { index += 1 })
        st.equal(index, arr.length, 'iterates ' + arr.length + ' times')
        st.end()
    })

    t.test('first iterator argument', function (st) {
        var index = 0
        st.plan(arr.length)
        forEach(arr, function (item) {
            st.equal(arr[index], item, 'item ' + index + ' is passed as first argument')
            index += 1
        })
        st.end();
    })

    t.test('second iterator argument', function (st) {
        var counter = 0
        st.plan(arr.length)
        forEach(arr, function (item, index) {
            st.equal(counter, index, 'index ' + index + ' is passed as second argument')
            counter += 1
        })
        st.end();
    })

    t.test('third iterator argument', function (st) {
        st.plan(arr.length)
        forEach(arr, function (item, index, array) {
            st.deepEqual(arr, array, 'array is passed as third argument')
        })
        st.end();
    })

    t.test('context argument', function (st) {
        var context = {}
        forEach([], function () {
            st.equal(this, context, '"this" is the passed context')
        }, context)
        st.end()
    })

    t.end()
})

test('object', function (t) {
    var obj = {
        a: 1,
        b: 2,
        c: 3
    }
    var keys = ['a', 'b', 'c']

    var F = function () {
        this.a = 1
        this.b = 2
    }
    F.prototype.c = 3
    var fKeys = ['a', 'b']

    t.test('iterates over every object literal key', function (st) {
        var counter = 0
        forEach(obj, function () { counter += 1 })
        st.equal(counter, keys.length, 'iterated ' + counter + ' times')
        st.end()
    })

    t.test('iterates only over own keys', function (st) {
        var counter = 0
        forEach(new F(), function () { counter += 1 })
        st.equal(counter, fKeys.length, 'iterated ' + fKeys.length + ' times')
        st.end()
    })

    t.test('first iterator argument', function (st) {
        var index = 0
        st.plan(keys.length)
        forEach(obj, function (item) {
            st.equal(obj[keys[index]], item, 'item at key ' + keys[index] + ' is passed as first argument')
            index += 1
        })
        st.end()
    })

    t.test('second iterator argument', function (st) {
        var counter = 0
        st.plan(keys.length)
        forEach(obj, function (item, key) {
            st.equal(keys[counter], key, 'key ' + key + ' is passed as second argument')
            counter += 1
        })
        st.end()
    })

    t.test('third iterator argument', function (st) {
        st.plan(keys.length)
        forEach(obj, function (item, key, object) {
            st.deepEqual(obj, object, 'object is passed as third argument')
        })
        st.end()
    })

    t.test('context argument', function (st) {
        var context = {}
        forEach({}, function () {
            st.equal(this, context, '"this" is the passed context')
        }, context)
        st.end()
    })

    t.end()
})


test('string', function (t) {
    var str = 'str'
    t.test('second iterator argument', function (st) {
        var counter = 0
        st.plan(str.length * 2 + 1)
        forEach(str, function (item, index) {
            st.equal(counter, index, 'index ' + index + ' is passed as second argument')
            st.equal(str.charAt(index), item)
            counter += 1
        })
        st.equal(counter, str.length, 'iterates ' + str.length + ' times')
        st.end()
    })
    t.end()
})