50 строки
1.8 KiB
JavaScript
50 строки
1.8 KiB
JavaScript
var vows = require("vows"),
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load = require("../load"),
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assert = require("../assert");
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var suite = vows.describe("d3.permute");
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suite.addBatch({
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"permute": {
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topic: load("arrays/permute").expression("d3.permute"),
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"permutes according to the specified index": function(permute) {
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assert.deepEqual(permute([3, 4, 5], [2, 1, 0]), [5, 4, 3]);
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assert.deepEqual(permute([3, 4, 5], [2, 0, 1]), [5, 3, 4]);
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assert.deepEqual(permute([3, 4, 5], [0, 1, 2]), [3, 4, 5]);
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},
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"does not modify the input array": function(permute) {
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var input = [3, 4, 5];
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permute(input, [2, 1, 0]);
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assert.deepEqual(input, [3, 4, 5]);
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},
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"can duplicate input values": function(permute) {
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assert.deepEqual(permute([3, 4, 5], [0, 1, 0]), [3, 4, 3]);
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assert.deepEqual(permute([3, 4, 5], [2, 2, 2]), [5, 5, 5]);
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assert.deepEqual(permute([3, 4, 5], [0, 1, 1]), [3, 4, 4]);
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},
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"can return more elements": function(permute) {
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assert.deepEqual(permute([3, 4, 5], [0, 0, 1, 2]), [3, 3, 4, 5]);
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assert.deepEqual(permute([3, 4, 5], [0, 1, 1, 1]), [3, 4, 4, 4]);
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},
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"can return fewer elements": function(permute) {
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assert.deepEqual(permute([3, 4, 5], [0]), [3]);
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assert.deepEqual(permute([3, 4, 5], [1, 2]), [4, 5]);
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assert.deepEqual(permute([3, 4, 5], []), []);
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},
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"can return undefined elements": function(permute) {
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var v1 = permute([3, 4, 5], [10]);
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assert.equal(v1.length, 1);
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assert.isUndefined(v1[0]);
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var v2 = permute([3, 4, 5], [-1]);
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assert.equal(v2.length, 1);
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assert.isUndefined(v2[0]);
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var v3 = permute([3, 4, 5], [0, -1]);
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assert.equal(v3.length, 2);
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assert.equal(v3[0], 3);
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assert.isUndefined(v3[1]);
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}
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}
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});
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suite.export(module);
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