test/interpolate/rgb-test.js

var vows = require("vows"),
    load = require("../load"),
    assert = require("../assert");

var suite = vows.describe("d3.interpolateRgb");

suite.addBatch({
  "interpolateRgb": {
    topic: load("interpolate/rgb"), // beware instanceof d3_Color
    "parses string input": function(d3) {
      assert.strictEqual(d3.interpolateRgb("steelblue", "#f00")(.2), "#6b6890");
      assert.strictEqual(d3.interpolateRgb("steelblue", "#f00")(.6), "#b53448");
    },
    "parses d3.rgb input": function(d3) {
      assert.strictEqual(d3.interpolateRgb(d3.rgb("steelblue"), "#f00")(.2), "#6b6890");
      assert.strictEqual(d3.interpolateRgb("steelblue", d3.rgb(255, 0, 0))(.6), "#b53448");
    },
    "parses d3.hsl input": function(d3) {
      assert.strictEqual(d3.interpolateRgb(d3.hsl("steelblue"), "#f00")(.2), "#6b6890");
      assert.strictEqual(d3.interpolateRgb("steelblue", d3.hsl(0, 1, .5))(.6), "#b53448");
    },
    "interpolates in RGB color space": function(d3) {
      assert.strictEqual(d3.interpolateRgb("steelblue", "#f00")(.2), "#6b6890");
    },
    "outputs an RGB string": function(d3) {
      assert.strictEqual(d3.interpolateRgb("steelblue", "#f00")(.2), "#6b6890");
    }
  }
});

suite.export(module);