Added a test for the new bin utilities module.

tests/testBins.js

@@ -0,0 +1,14 @@
+/* eslint-disable no-undef */
+import { expect } from "chai";
+import { describe } from "mocha";
+import { createUniAvgSel } from "../src/support/bins.js";
+
+describe("Bin utilities", function () {
+    describe("the function that generates a uniform average of the array values", function () {
+        it("returns 2 given [1, 2, 3]", function () {
+            const unifAvgFunc = createUniAvgSel();
+            const avg = unifAvgFunc([1, 2, 3]);
+            expect(avg).to.equal(2);
+        });
+    });
+});