70 строки
2.3 KiB
JavaScript
70 строки
2.3 KiB
JavaScript
require("../env");
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require("../../d3");
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var vows = require("vows"),
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assert = require("assert");
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var suite = vows.describe("d3.scale.quantize");
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suite.addBatch({
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"quantize": {
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topic: function() {
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return d3.scale.quantize;
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},
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"has the default domain [0, 1]": function(quantize) {
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var x = quantize();
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assert.deepEqual(x.domain(), [0, 1]);
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assert.equal(x(.25), 0);
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},
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"has the default range [0, 1]": function(quantize) {
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var x = quantize();
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assert.deepEqual(x.range(), [0, 1]);
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assert.equal(x(.75), 1);
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},
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"maps a number to a discrete value in the range": function(quantize) {
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var x = quantize().range([0, 1, 2]);
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assert.equal(x(0), 0);
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assert.equal(x(.2), 0);
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assert.equal(x(.4), 1);
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assert.equal(x(.6), 1);
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assert.equal(x(.8), 2);
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assert.equal(x(1), 2);
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},
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"coerces domain to numbers": function(quantize) {
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var x = quantize().domain(["0", "100"]);
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assert.strictEqual(x.domain()[0], 0);
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assert.strictEqual(x.domain()[1], 100);
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},
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"only considers the extent of the domain": function(quantize) {
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var x = quantize().domain([-1, 0, 100]);
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assert.deepEqual(x.domain(), [-1, 100]);
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},
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"clamps input values to the domain": function(quantize) {
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var a = {}, b = {}, c = {}, x = quantize().range([a, b, c]);
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assert.equal(x(-.5), a);
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assert.equal(x(1.5), c);
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},
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"range cardinality determines the degree of quantization": function(quantize) {
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var x = quantize();
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assert.inDelta(x.range(d3.range(0, 1.001, .001))(1/3), .333, 1e-6);
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assert.inDelta(x.range(d3.range(0, 1.01, .01))(1/3), .33, 1e-6);
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assert.inDelta(x.range(d3.range(0, 1.1, .1))(1/3), .3, 1e-6);
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assert.inDelta(x.range(d3.range(0, 1.2, .2))(1/3), .4, 1e-6);
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assert.inDelta(x.range(d3.range(0, 1.25, .25))(1/3), .25, 1e-6);
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assert.inDelta(x.range(d3.range(0, 1.5, .5))(1/3), .5, 1e-6);
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assert.inDelta(x.range(d3.range(1))(1/3), 0, 1e-6);
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},
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"range values are arbitrary": function(quantize) {
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var a = {}, b = {}, c = {}, x = quantize().range([a, b, c]);
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assert.equal(x(0), a);
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assert.equal(x(.2), a);
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assert.equal(x(.4), b);
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assert.equal(x(.6), b);
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assert.equal(x(.8), c);
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assert.equal(x(1), c);
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}
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}
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});
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suite.export(module);
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