40 строки
1.4 KiB
JavaScript
40 строки
1.4 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.mean");
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suite.addBatch({
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"mean": {
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topic: load("arrays/mean").expression("d3.mean"),
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"returns the mean value for numbers": function(mean) {
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assert.equal(mean([1]), 1);
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assert.equal(mean([5, 1, 2, 3, 4]), 3);
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assert.equal(mean([20, 3]), 11.5);
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assert.equal(mean([3, 20]), 11.5);
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},
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"ignores null, undefined and NaN": function(mean) {
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assert.equal(mean([NaN, 1, 2, 3, 4, 5]), 3);
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assert.equal(mean([1, 2, 3, 4, 5, NaN]), 3);
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assert.equal(mean([10, null, 3, undefined, 5, NaN]), 6);
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},
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"can handle large numbers without overflowing": function(mean) {
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assert.equal(mean([Number.MAX_VALUE, Number.MAX_VALUE]), Number.MAX_VALUE);
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assert.equal(mean([-Number.MAX_VALUE, -Number.MAX_VALUE]), -Number.MAX_VALUE);
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},
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"returns undefined for empty array": function(mean) {
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assert.isUndefined(mean([]));
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assert.isUndefined(mean([null]));
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assert.isUndefined(mean([undefined]));
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assert.isUndefined(mean([NaN]));
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assert.isUndefined(mean([NaN, NaN]));
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},
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"applies the optional accessor function": function(mean) {
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assert.equal(mean([[1, 2, 3, 4, 5], [2, 4, 6, 8, 10]], function(d) { return mean(d); }), 4.5);
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assert.equal(mean([1, 2, 3, 4, 5], function(d, i) { return i; }), 2);
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}
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}
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});
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suite.export(module);
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