Mock HTTP requests in unit tests

babel.config.js

@@ -0,0 +1,6 @@
+export default {
+    presets: [
+        ['@babel/preset-env', {targets: {node: 'current'}}],
+        '@babel/preset-typescript',
+    ],
+};

package.json

@@ -13,9 +13,13 @@
 		"format": "prettier --write .",
 		"lint": "prettier --check . && eslint .",
 		"storybook": "storybook dev -p 6006",
-		"build-storybook": "storybook build"
+		"build-storybook": "storybook build",
+		"test": "jest"
 	},
 	"devDependencies": {
+		"@babel/core": "^7.28.5",
+		"@babel/preset-env": "^7.28.5",
+		"@babel/preset-typescript": "^7.28.5",
 		"@chromatic-com/storybook": "^4.1.2",
 		"@eslint/compat": "^1.4.0",
 		"@eslint/js": "^9.38.0",
@@ -33,6 +37,7 @@
 		"@tailwindcss/vite": "^4.1.14",
 		"@types/node": "^24",
 		"axios-mock-adapter": "^2.1.0",
+		"babel-jest": "^30.2.0",
 		"eslint": "^9.38.0",
 		"eslint-config-prettier": "^10.1.8",
 		"eslint-plugin-storybook": "^10.0.5",

src/lib/api.test.ts

@@ -1,20 +1,27 @@
-import { Axios } from 'axios';
+import axios from 'axios';
 import MockAdapter from 'axios-mock-adapter';
 import { HeaptraderAPI } from './api';
 import { expect, jest, test } from '@jest/globals';
 
-let mock: MockAdapter;
-
 class HeaptraderAPITest extends HeaptraderAPI
 {
+    public _mock: MockAdapter;
+
     constructor()
     {
         super("");
-        mock = new MockAdapter(this._axios);
+        this._mock = new MockAdapter(axios);
+        this.setupMockResponses();
+    }
+
+    setupMockResponses(): void
+    {
+        this._mock.onGet("/up").reply(200, {});
     }
 }
 
 test('check uptime', async () => {
-    const api = new HeaptraderAPI();
-    await api.heartbeat();
+    const api = new HeaptraderAPITest();
+    const success = await api.heartbeat();
+    expect(success).toBe(true);
 });