add tests for getExtension

Author: mathieudutour

test/specs/util/url.spec.js

@@ -0,0 +1,24 @@
+"use strict";
+
+const chai = require("chai");
+const chaiSubset = require("chai-subset");
+chai.use(chaiSubset);
+const { expect } = chai;
+const $url = require("../../../lib/util/url");
+
+describe("Return the extension of a URL", () => {
+  it("should return an empty string if there isn't any extension", async () => {
+    const extension = $url.getExtension("/file");
+    expect(extension).to.equal("");
+  });
+
+  it("should return the extension in lowercase", async () => {
+    const extension = $url.getExtension("/file.YML");
+    expect(extension).to.equal(".yml");
+  });
+
+  it("should return the extension without the query", async () => {
+    const extension = $url.getExtension("/file.yml?foo=bar");
+    expect(extension).to.equal(".yml");
+  });
+});