File: index.js

package info (click to toggle)
node-function-bind 1.1.1+ds-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 232 kB
  • sloc: makefile: 49; sh: 26
file content (252 lines) | stat: -rw-r--r-- 8,991 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
// jscs:disable requireUseStrict

var test = require('tape');

var functionBind = require('../implementation');
var getCurrentContext = function () { return this; };

test('functionBind is a function', function (t) {
    t.equal(typeof functionBind, 'function');
    t.end();
});

test('non-functions', function (t) {
    var nonFunctions = [true, false, [], {}, 42, 'foo', NaN, /a/g];
    t.plan(nonFunctions.length);
    for (var i = 0; i < nonFunctions.length; ++i) {
        try { functionBind.call(nonFunctions[i]); } catch (ex) {
            t.ok(ex instanceof TypeError, 'throws when given ' + String(nonFunctions[i]));
        }
    }
    t.end();
});

test('without a context', function (t) {
    t.test('binds properly', function (st) {
        var args, context;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                context = this;
            })
        };
        namespace.func(1, 2, 3);
        st.deepEqual(args, [1, 2, 3]);
        st.equal(context, getCurrentContext.call());
        st.end();
    });

    t.test('binds properly, and still supplies bound arguments', function (st) {
        var args, context;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                context = this;
            }, undefined, 1, 2, 3)
        };
        namespace.func(4, 5, 6);
        st.deepEqual(args, [1, 2, 3, 4, 5, 6]);
        st.equal(context, getCurrentContext.call());
        st.end();
    });

    t.test('returns properly', function (st) {
        var args;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                return this;
            }, null)
        };
        var context = namespace.func(1, 2, 3);
        st.equal(context, getCurrentContext.call(), 'returned context is namespaced context');
        st.deepEqual(args, [1, 2, 3], 'passed arguments are correct');
        st.end();
    });

    t.test('returns properly with bound arguments', function (st) {
        var args;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                return this;
            }, null, 1, 2, 3)
        };
        var context = namespace.func(4, 5, 6);
        st.equal(context, getCurrentContext.call(), 'returned context is namespaced context');
        st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'passed arguments are correct');
        st.end();
    });

    t.test('called as a constructor', function (st) {
        var thunkify = function (value) {
            return function () { return value; };
        };
        st.test('returns object value', function (sst) {
            var expectedReturnValue = [1, 2, 3];
            var Constructor = functionBind.call(thunkify(expectedReturnValue), null);
            var result = new Constructor();
            sst.equal(result, expectedReturnValue);
            sst.end();
        });

        st.test('does not return primitive value', function (sst) {
            var Constructor = functionBind.call(thunkify(42), null);
            var result = new Constructor();
            sst.notEqual(result, 42);
            sst.end();
        });

        st.test('object from bound constructor is instance of original and bound constructor', function (sst) {
            var A = function (x) {
                this.name = x || 'A';
            };
            var B = functionBind.call(A, null, 'B');

            var result = new B();
            sst.ok(result instanceof B, 'result is instance of bound constructor');
            sst.ok(result instanceof A, 'result is instance of original constructor');
            sst.end();
        });

        st.end();
    });

    t.end();
});

test('with a context', function (t) {
    t.test('with no bound arguments', function (st) {
        var args, context;
        var boundContext = {};
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                context = this;
            }, boundContext)
        };
        namespace.func(1, 2, 3);
        st.equal(context, boundContext, 'binds a context properly');
        st.deepEqual(args, [1, 2, 3], 'supplies passed arguments');
        st.end();
    });

    t.test('with bound arguments', function (st) {
        var args, context;
        var boundContext = {};
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                context = this;
            }, boundContext, 1, 2, 3)
        };
        namespace.func(4, 5, 6);
        st.equal(context, boundContext, 'binds a context properly');
        st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'supplies bound and passed arguments');
        st.end();
    });

    t.test('returns properly', function (st) {
        var boundContext = {};
        var args;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                return this;
            }, boundContext)
        };
        var context = namespace.func(1, 2, 3);
        st.equal(context, boundContext, 'returned context is bound context');
        st.notEqual(context, getCurrentContext.call(), 'returned context is not lexical context');
        st.deepEqual(args, [1, 2, 3], 'passed arguments are correct');
        st.end();
    });

    t.test('returns properly with bound arguments', function (st) {
        var boundContext = {};
        var args;
        var namespace = {
            func: functionBind.call(function () {
                args = Array.prototype.slice.call(arguments);
                return this;
            }, boundContext, 1, 2, 3)
        };
        var context = namespace.func(4, 5, 6);
        st.equal(context, boundContext, 'returned context is bound context');
        st.notEqual(context, getCurrentContext.call(), 'returned context is not lexical context');
        st.deepEqual(args, [1, 2, 3, 4, 5, 6], 'passed arguments are correct');
        st.end();
    });

    t.test('passes the correct arguments when called as a constructor', function (st) {
        var expected = { name: 'Correct' };
        var namespace = {
            Func: functionBind.call(function (arg) {
                return arg;
            }, { name: 'Incorrect' })
        };
        var returned = new namespace.Func(expected);
        st.equal(returned, expected, 'returns the right arg when called as a constructor');
        st.end();
    });

    t.test('has the new instance\'s context when called as a constructor', function (st) {
        var actualContext;
        var expectedContext = { foo: 'bar' };
        var namespace = {
            Func: functionBind.call(function () {
                actualContext = this;
            }, expectedContext)
        };
        var result = new namespace.Func();
        st.equal(result instanceof namespace.Func, true);
        st.notEqual(actualContext, expectedContext);
        st.end();
    });

    t.end();
});

test('bound function length', function (t) {
    t.test('sets a correct length without thisArg', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; });
        st.equal(subject.length, 3);
        st.equal(subject(1, 2, 3), 6);
        st.end();
    });

    t.test('sets a correct length with thisArg', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {});
        st.equal(subject.length, 3);
        st.equal(subject(1, 2, 3), 6);
        st.end();
    });

    t.test('sets a correct length without thisArg and first argument', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; }, undefined, 1);
        st.equal(subject.length, 2);
        st.equal(subject(2, 3), 6);
        st.end();
    });

    t.test('sets a correct length with thisArg and first argument', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {}, 1);
        st.equal(subject.length, 2);
        st.equal(subject(2, 3), 6);
        st.end();
    });

    t.test('sets a correct length without thisArg and too many arguments', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; }, undefined, 1, 2, 3, 4);
        st.equal(subject.length, 0);
        st.equal(subject(), 6);
        st.end();
    });

    t.test('sets a correct length with thisArg and too many arguments', function (st) {
        var subject = functionBind.call(function (a, b, c) { return a + b + c; }, {}, 1, 2, 3, 4);
        st.equal(subject.length, 0);
        st.equal(subject(), 6);
        st.end();
    });
});