Login flow working

tests/link_codes.test.ts

@@ -0,0 +1,47 @@
+import { InMemoryLinkCodes } from "../src/link_codes"
+
+describe("InMemoryLinkCodes", () => {
+  const linkCodes = new InMemoryLinkCodes()
+
+  describe('minting', () => {
+    it('should be able to mint unique codes', () => {
+      const code1 = linkCodes.mint()
+      const code2 = linkCodes.mint()
+      const code3 = linkCodes.mint()
+
+      expect(code1).not.toEqual(code2);
+      expect(code1).not.toEqual(code3);
+    });
+  });
+
+  describe("associating a code with a user", () => {
+    describe('when token is valid', () => {
+      it('should associate the token', () => {
+        const linkCode = linkCodes.mint();
+        const association = { authToken: "token123", nickname: "bob", userId: "1" };
+
+        linkCodes.associate(linkCode, association);
+
+        expect(linkCodes.associationFor(linkCode)).toEqual(association);
+      }); 
+    });
+
+    describe('when token is valid', () => {
+      it('should throw an error', () => {
+        const invalidLinkCode = "invalidLinkCode";
+        const association = { authToken: "token123", nickname: "bob", userId: "1" };
+
+        expect(() => linkCodes.associate(invalidLinkCode, association)).toThrow(`Invalid linkCode ${invalidLinkCode}`)
+      }); 
+    });
+  });
+
+  describe('fetching an association for a linkCode', () => {
+    describe('when the token doesnt exist', () => {
+      it('should return undefined', () => {
+        const missingLinkCode = 'someLinkCodeThatDoesntExist';
+        expect(linkCodes.associationFor(missingLinkCode)).toBeUndefined()
+      });
+    })
+  });
+})