test: mock api endpoints and let unit tests use those endpoints

jest.config.ts

@@ -76,19 +76,12 @@ export default {
   // ],
 
   // An array of file extensions your modules use
-  // moduleFileExtensions: [
-  //   "js",
-  //   "mjs",
-  //   "cjs",
-  //   "jsx",
-  //   "ts",
-  //   "tsx",
-  //   "json",
-  //   "node"
-  // ],
+  // moduleFileExtensions: ["js", "ts", "cjs", "json"],
 
   // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
-  // moduleNameMapper: {},
+  moduleNameMapper: {
+    "^@/(.*)$": "<rootDir>/src/$1",
+  },
 
   // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
   // modulePathIgnorePatterns: [],
@@ -135,7 +128,7 @@ export default {
   // setupFiles: [],
 
   // A list of paths to modules that run some code to configure or set up the testing framework before each test
-  // setupFilesAfterEnv: [],
+  setupFilesAfterEnv: ["<rootDir>/jest.setup.ts"],
 
   // The number of seconds after which a test is considered as slow and reported as such in the results.
   // slowTestThreshold: 5,
@@ -168,7 +161,9 @@ export default {
   // testRunner: "jest-circus/runner",
 
   // A map from regular expressions to paths to transformers
-  // transform: undefined,
+  // transform: {
+  //   "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/ts-jest",
+  // },
 
   // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
   transformIgnorePatterns: ["/node_modules/", "\\.pnp\\.[^\\/]+$"],

jest.setup.ts

@@ -0,0 +1,19 @@
+import { server } from "@/api/mocks/server";
+
+beforeAll(() => {
+  // Establish API mocking before all tests.
+  server.listen();
+});
+
+afterEach(() => {
+  // Reset any MSW request handlers that we may add during the tests,
+  // so they don't affect other tests.
+  server.resetHandlers();
+
+  jest.clearAllMocks();
+});
+
+afterAll(() => {
+  // Clean up after the tests are finished.
+  server.close();
+});