42 строки
1.4 KiB
JavaScript
42 строки
1.4 KiB
JavaScript
require("../env");
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var vows = require("vows"),
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assert = require("assert");
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var suite = vows.describe("d3.first");
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suite.addBatch({
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"first": {
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topic: function() {
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return d3.first;
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},
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"compares using natural order by default": function(first) {
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assert.strictEqual(first([1, 0]), 0);
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assert.strictEqual(first(["1", 0]), 0);
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assert.strictEqual(first(["2", "10"]), "10");
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assert.strictEqual(first(["2", NaN, "10"]), "10");
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assert.strictEqual(first([2, NaN, 10]), 2);
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},
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"compares using optional comparator": function(first) {
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var i = 0, aa, bb, o = new Object();
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assert.strictEqual(first([1, o], function(a, b) { aa = a; bb = b; return ++i; }), o);
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assert.strictEqual(aa, 1);
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assert.strictEqual(bb, o);
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assert.strictEqual(first([1, 0], d3.descending), 1);
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assert.strictEqual(first(["1", 0], d3.descending), "1");
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assert.strictEqual(first(["2", "10"], d3.descending), "2");
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assert.strictEqual(first(["2", NaN, "10"], d3.descending), "2");
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assert.strictEqual(first([2, NaN, 10], d3.descending), 10);
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},
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"returns the first of equal values": function(last) {
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var a = new Object(), b = new Object(), c = new Object();
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assert.strictEqual(last([a, b, c], function() { return 0; }), a);
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},
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"returns undefined for an empty array": function(first) {
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assert.isUndefined(first([]));
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}
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}
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});
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suite.export(module);
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