1var concatMap = require('../');
2var test = require('tape');
3
4test('empty or not', function (t) {
5    var xs = [ 1, 2, 3, 4, 5, 6 ];
6    var ixes = [];
7    var ys = concatMap(xs, function (x, ix) {
8        ixes.push(ix);
9        return x % 2 ? [ x - 0.1, x, x + 0.1 ] : [];
10    });
11    t.same(ys, [ 0.9, 1, 1.1, 2.9, 3, 3.1, 4.9, 5, 5.1 ]);
12    t.same(ixes, [ 0, 1, 2, 3, 4, 5 ]);
13    t.end();
14});
15
16test('always something', function (t) {
17    var xs = [ 'a', 'b', 'c', 'd' ];
18    var ys = concatMap(xs, function (x) {
19        return x === 'b' ? [ 'B', 'B', 'B' ] : [ x ];
20    });
21    t.same(ys, [ 'a', 'B', 'B', 'B', 'c', 'd' ]);
22    t.end();
23});
24
25test('scalars', function (t) {
26    var xs = [ 'a', 'b', 'c', 'd' ];
27    var ys = concatMap(xs, function (x) {
28        return x === 'b' ? [ 'B', 'B', 'B' ] : x;
29    });
30    t.same(ys, [ 'a', 'B', 'B', 'B', 'c', 'd' ]);
31    t.end();
32});
33
34test('undefs', function (t) {
35    var xs = [ 'a', 'b', 'c', 'd' ];
36    var ys = concatMap(xs, function () {});
37    t.same(ys, [ undefined, undefined, undefined, undefined ]);
38    t.end();
39});
40