refactor: refactored retryer logic & handled invalid tokens

tests/retryer.test.js

@@ -0,0 +1,50 @@
+require("@testing-library/jest-dom");
+const retryer = require("../src/retryer");
+
+const fetcher = jest.fn((variables, token) => {
+  console.log(variables, token);
+  return new Promise((res, rej) => res({ data: "ok" }));
+});
+
+const fetcherFail = jest.fn(() => {
+  return new Promise((res, rej) =>
+    res({ data: { errors: [{ type: "RATE_LIMITED" }] } })
+  );
+});
+
+const fetcherFailOnSecondTry = jest.fn((_vars, _token, retries) => {
+  return new Promise((res, rej) => {
+    // faking rate limit
+    if (retries < 1) {
+      return res({ data: { errors: [{ type: "RATE_LIMITED" }] } });
+    }
+    return res({ data: "ok" });
+  });
+});
+
+describe("Test Retryer", () => {
+  it("retryer should return value and have zero retries on first try", async () => {
+    let res = await retryer(fetcher, {});
+
+    expect(fetcher).toBeCalledTimes(1);
+    expect(res).toStrictEqual({ data: "ok" });
+  });
+
+  it("retryer should return value and have 2 retries", async () => {
+    let res = await retryer(fetcherFailOnSecondTry, {});
+
+    expect(fetcherFailOnSecondTry).toBeCalledTimes(2);
+    expect(res).toStrictEqual({ data: "ok" });
+  });
+
+  it("retryer should throw error if maximum retries reached", async () => {
+    let res;
+
+    try {
+      res = await retryer(fetcherFail, {});
+    } catch (err) {
+      expect(fetcherFail).toBeCalledTimes(8);
+      expect(err.message).toBe("Maximum retries exceeded");
+    }
+  });
+});