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var test = require('tape');
var forEach = require('./index.js');
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.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 = {};
st.plan(1);
forEach([1], 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 = {};
st.plan(1);
forEach({ a: 1 }, 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');
});
t.end();
});
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