test(utils): add tests for utility functions in utils folder

test/utils/retryAxios.test.js

@@ -0,0 +1,75 @@
+import { expect } from 'chai';
+import nock from 'nock';
+import sinon from 'sinon';
+import esmock from 'esmock';
+
+describe('retryAxios', () => {
+  let axiosInstance, axios, axiosRetry;
+
+  beforeEach(async () => {
+    axios = {
+      create: sinon.stub().returnsThis(),
+      interceptors: {
+        response: {
+          use: sinon.stub()
+        }
+      }
+    };
+
+    axiosRetry = sinon.stub();
+
+    axiosInstance = await esmock('../../src/utils/retryAxios.js', {
+      'axios': axios,
+      'axios-retry': axiosRetry
+    });
+  });
+
+  it('should create an axios instance and configure retry policy', async () => {
+    expect(axios.create.calledOnce).to.be.true;
+    expect(axiosRetry.calledOnce).to.be.true;
+
+    const [instance, config] = axiosRetry.firstCall.args;
+    expect(instance).to.equal(axiosInstance);
+    expect(config.retries).to.equal(3);
+    expect(config.retryDelay(1)).to.equal(2000);
+    expect(config.retryDelay(2)).to.equal(4000);
+    expect(config.retryCondition({ response: { status: 429 }})).to.be.true;
+    expect(config.retryCondition({ response: { status: 500 }})).to.be.true;
+    expect(config.retryCondition({ response: { status: 400 }})).to.be.false;
+  });
+
+  it('should retry 3 times before failing for 500 status code', async () => {
+    nock('https://api.example.com')
+      .get('/resource')
+      .reply(500)
+      .persist();
+
+    let error;
+    try {
+      await axiosInstance.get('https://api.example.com/resource');
+    } catch (err) {
+      error = err;
+    }
+    expect(error).to.exist;
+
+    nock.cleanAll();
+  });
+
+  it('should not retry for 400 status code', async () => {
+    nock('https://api.example.com')
+      .get('/resource')
+      .reply(400);
+
+    let error;
+    try {
+      await axiosInstance.get('https://api.example.com/resource');
+    } catch (err) {
+      error = err;
+    }
+
+    expect(error).to.exist;
+
+    nock.cleanAll();
+  });
+});
+