Fix auth using header

modules/__tests__/_publicKey-test.js

@@ -0,0 +1,21 @@
+const request = require("supertest");
+
+const createServer = require("../createServer");
+
+describe("The /_publicKey endpoint", () => {
+  let server;
+  beforeEach(() => {
+    server = createServer();
+  });
+
+  describe("GET /_publicKey", () => {
+    it("echoes the public key", done => {
+      request(server)
+        .get("/_publicKey")
+        .end((err, res) => {
+          expect(res.text).toMatch(/PUBLIC KEY/);
+          done();
+        });
+    });
+  });
+});