tests for size scale

test/size.test.js

@@ -0,0 +1,40 @@
+define(function (require) {
+    var expect = require('chai').expect;
+    var assert = require('chai').assert;
+    var sizeScale = require('tau_modules/elements/size').sizeScale;
+
+    var check = function(sizeScale, samples) {
+        samples.forEach(function(s) {
+            var src = parseFloat(parseFloat(sizeScale(s[0])).toFixed(4));
+            expect(src).to.deep.equal(s[1]);
+        });
+    };
+
+    describe("size scale", function () {
+
+        it("should support positive domain", function () {
+            var samples = [
+                [100, 100],
+                [50, 58.9203],
+                [10, 26.0566],
+                [1, 18.6623],
+                [0, 17.8407]
+            ];
+
+            var scale = sizeScale([0, 100], 100);
+
+            check(scale, samples);
+        });
+
+        it("should support negative domain", function () {
+            var samples = [
+                [0, 100]
+                //[-100, 17.8407]
+            ];
+
+            var scale = sizeScale([-100, 0], 100);
+
+            check(scale, samples);
+        });
+    });
+});