Sort keys in createSearch + add tests

server/utils/__tests__/createSearch-test.js

@@ -0,0 +1,15 @@
+const createSearch = require("../createSearch");
+
+describe("createSearch", () => {
+  it("omits the trailing = for empty string values", () => {
+    expect(createSearch({ a: "a", b: "" })).toEqual("?a=a&b");
+  });
+
+  it("sorts keys", () => {
+    expect(createSearch({ b: "b", a: "a", c: "c" })).toEqual("?a=a&b=b&c=c");
+  });
+
+  it("returns an empty string when there are no params", () => {
+    expect(createSearch({})).toEqual("");
+  });
+});