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Stored size: 1.43 KB
Contents
var vows = require("vows"),
load = require("../load"),
assert = require("../assert");
var suite = vows.describe("d3.mean");
suite.addBatch({
"mean": {
topic: load("arrays/mean").expression("d3.mean"),
"returns the mean value for numbers": function(mean) {
assert.equal(mean([1]), 1);
assert.equal(mean([5, 1, 2, 3, 4]), 3);
assert.equal(mean([20, 3]), 11.5);
assert.equal(mean([3, 20]), 11.5);
},
"ignores null, undefined and NaN": function(mean) {
assert.equal(mean([NaN, 1, 2, 3, 4, 5]), 3);
assert.equal(mean([1, 2, 3, 4, 5, NaN]), 3);
assert.equal(mean([10, null, 3, undefined, 5, NaN]), 6);
},
"can handle large numbers without overflowing": function(mean) {
assert.equal(mean([Number.MAX_VALUE, Number.MAX_VALUE]), Number.MAX_VALUE);
assert.equal(mean([-Number.MAX_VALUE, -Number.MAX_VALUE]), -Number.MAX_VALUE);
},
"returns undefined for empty array": function(mean) {
assert.isUndefined(mean([]));
assert.isUndefined(mean([null]));
assert.isUndefined(mean([undefined]));
assert.isUndefined(mean([NaN]));
assert.isUndefined(mean([NaN, NaN]));
},
"applies the optional accessor function": function(mean) {
assert.equal(mean([[1, 2, 3, 4, 5], [2, 4, 6, 8, 10]], function(d) { return mean(d); }), 4.5);
assert.equal(mean([1, 2, 3, 4, 5], function(d, i) { return i; }), 2);
}
}
});
suite.export(module);
Version data entries
4 entries across 4 versions & 2 rubygems