251 lines
8.7 KiB
JavaScript
251 lines
8.7 KiB
JavaScript
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var test = require('tape');
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var functionBind = require('../implementation');
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var getCurrentContext = function () { return this; };
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test('functionBind is a function', function (t) {
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t.equal(typeof functionBind, 'function');
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t.end();
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});
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test('non-functions', function (t) {
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var nonFunctions = [true, false, [], {}, 42, 'foo', NaN, /a/g];
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t.plan(nonFunctions.length);
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for (var i = 0; i < nonFunctions.length; ++i) {
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try { functionBind.call(nonFunctions[i]); } catch (ex) {
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t.ok(ex instanceof TypeError, 'throws when given ' + String(nonFunctions[i]));
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}
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}
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t.end();
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});
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test('without a context', function (t) {
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t.test('binds properly', function (st) {
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var args, context;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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context = this;
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})
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};
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namespace.func(1, 2, 3);
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st.deepEqual(args, [1, 2, 3]);
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st.equal(context, getCurrentContext.call());
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st.end();
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});
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t.test('binds properly, and still supplies bound arguments', function (st) {
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var args, context;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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context = this;
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}, undefined, 1, 2, 3)
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};
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namespace.func(4, 5, 6);
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st.deepEqual(args, [1, 2, 3, 4, 5, 6]);
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st.equal(context, getCurrentContext.call());
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st.end();
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});
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t.test('returns properly', function (st) {
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var args;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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return this;
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}, null)
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};
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var context = namespace.func(1, 2, 3);
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st.equal(context, getCurrentContext.call(), 'returned context is namespaced context');
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st.deepEqual(args, [1, 2, 3], 'passed arguments are correct');
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st.end();
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});
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t.test('returns properly with bound arguments', function (st) {
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var args;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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return this;
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}, null, 1, 2, 3)
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};
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var context = namespace.func(4, 5, 6);
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st.equal(context, getCurrentContext.call(), 'returned context is namespaced context');
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st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'passed arguments are correct');
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st.end();
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});
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t.test('called as a constructor', function (st) {
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var thunkify = function (value) {
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return function () { return value; };
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};
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st.test('returns object value', function (sst) {
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var expectedReturnValue = [1, 2, 3];
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var Constructor = functionBind.call(thunkify(expectedReturnValue), null);
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var result = new Constructor();
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sst.equal(result, expectedReturnValue);
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sst.end();
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});
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st.test('does not return primitive value', function (sst) {
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var Constructor = functionBind.call(thunkify(42), null);
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var result = new Constructor();
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sst.notEqual(result, 42);
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sst.end();
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});
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st.test('object from bound constructor is instance of original and bound constructor', function (sst) {
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var A = function (x) {
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this.name = x || 'A';
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};
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var B = functionBind.call(A, null, 'B');
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var result = new B();
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sst.ok(result instanceof B, 'result is instance of bound constructor');
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sst.ok(result instanceof A, 'result is instance of original constructor');
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sst.end();
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});
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st.end();
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});
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t.end();
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});
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test('with a context', function (t) {
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t.test('with no bound arguments', function (st) {
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var args, context;
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var boundContext = {};
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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context = this;
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}, boundContext)
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};
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namespace.func(1, 2, 3);
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st.equal(context, boundContext, 'binds a context properly');
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st.deepEqual(args, [1, 2, 3], 'supplies passed arguments');
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st.end();
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});
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t.test('with bound arguments', function (st) {
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var args, context;
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var boundContext = {};
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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context = this;
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}, boundContext, 1, 2, 3)
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};
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namespace.func(4, 5, 6);
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st.equal(context, boundContext, 'binds a context properly');
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st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'supplies bound and passed arguments');
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st.end();
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});
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t.test('returns properly', function (st) {
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var boundContext = {};
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var args;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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return this;
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}, boundContext)
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};
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var context = namespace.func(1, 2, 3);
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st.equal(context, boundContext, 'returned context is bound context');
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st.notEqual(context, getCurrentContext.call(), 'returned context is not lexical context');
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st.deepEqual(args, [1, 2, 3], 'passed arguments are correct');
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st.end();
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});
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t.test('returns properly with bound arguments', function (st) {
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var boundContext = {};
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var args;
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var namespace = {
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func: functionBind.call(function () {
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args = Array.prototype.slice.call(arguments);
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return this;
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}, boundContext, 1, 2, 3)
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};
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var context = namespace.func(4, 5, 6);
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st.equal(context, boundContext, 'returned context is bound context');
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st.notEqual(context, getCurrentContext.call(), 'returned context is not lexical context');
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st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'passed arguments are correct');
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st.end();
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});
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t.test('passes the correct arguments when called as a constructor', function (st) {
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var expected = { name: 'Correct' };
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var namespace = {
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Func: functionBind.call(function (arg) {
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return arg;
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}, { name: 'Incorrect' })
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};
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var returned = new namespace.Func(expected);
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st.equal(returned, expected, 'returns the right arg when called as a constructor');
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st.end();
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});
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t.test('has the new instance\'s context when called as a constructor', function (st) {
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var actualContext;
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var expectedContext = { foo: 'bar' };
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var namespace = {
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Func: functionBind.call(function () {
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actualContext = this;
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}, expectedContext)
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};
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var result = new namespace.Func();
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st.equal(result instanceof namespace.Func, true);
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st.notEqual(actualContext, expectedContext);
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st.end();
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});
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t.end();
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});
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test('bound function length', function (t) {
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t.test('sets a correct length without thisArg', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; });
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st.equal(subject.length, 3);
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st.equal(subject(1, 2, 3), 6);
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st.end();
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});
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t.test('sets a correct length with thisArg', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {});
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st.equal(subject.length, 3);
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st.equal(subject(1, 2, 3), 6);
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st.end();
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});
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t.test('sets a correct length without thisArg and first argument', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; }, undefined, 1);
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st.equal(subject.length, 2);
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st.equal(subject(2, 3), 6);
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st.end();
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});
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t.test('sets a correct length with thisArg and first argument', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {}, 1);
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st.equal(subject.length, 2);
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st.equal(subject(2, 3), 6);
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st.end();
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});
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t.test('sets a correct length without thisArg and too many arguments', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; }, undefined, 1, 2, 3, 4);
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st.equal(subject.length, 0);
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st.equal(subject(), 6);
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st.end();
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});
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t.test('sets a correct length with thisArg and too many arguments', function (st) {
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var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {}, 1, 2, 3, 4);
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st.equal(subject.length, 0);
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st.equal(subject(), 6);
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st.end();
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});
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});
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