Add test scaffolding for generated SDK

[sweep-ai[bot]]

Description

This PR adds test scaffolding for the generated SDK in the fern-typescript repository. The goal is to provide a basic set of tests for each generated module, making it easier for developers to write tests for their specific use cases.

Summary

• Added a Jest configuration file (jest.config.js) at the root of the project to define the testing environment for the SDK.
• Modified the SdkGeneratorCli.ts file to automatically generate a test file for each generated module. The test file is placed in a corresponding __tests__ directory within the module directory.
• Created a base test file (sdk-basic-auth.test.ts) in the __tests__ directory of the fern/basic-auth module. This file serves as a template for all generated tests and contains a basic test that checks if the module exports are defined.
• Added a test case in the generate.test.ts file to verify that a test file is created for each generated module and that the test file has the correct structure.

Please review and merge this PR to enable test scaffolding for the generated SDK in fern-typescript.

Fixes #1.

To checkout this PR branch, run the following command in your terminal:

git checkout sweep/feature/test-scaffolding

[wwzeng1]

src/SdkGeneratorCli.ts:113:52 - error TS2339: Property 'getModules' does not exist on type 'PersistedTypescriptProject'.

113 const modules = persistedTypescriptProject.getModules();

src/SdkGeneratorCli.ts:115:29 - error TS2304: Cannot find name 'path'.

115             const testDir = path.join(module.getDirectory(), '__tests__');

src/SdkGeneratorCli.ts:116:18 - error TS2304: Cannot find name 'fs'.

116 if (!fs.existsSync(testDir)){ ~~

src/SdkGeneratorCli.ts:117:17 - error TS2304: Cannot find name 'fs'.

117 fs.mkdirSync(testDir); ~~

src/SdkGeneratorCli.ts:119:30 - error TS2304: Cannot find name 'path'.

119 const testFile = path.join(testDir, ${module.getName()}.test.ts);

src/SdkGeneratorCli.ts:120:13 - error TS2304: Cannot find name 'fs'.

120             fs.writeFileSync(testFile, 'import { expect } from "chai";\n\n// TODO: Add tests for the module');
                ~~

src/__test__/generate.test.ts:325:30 - error TS2339: Property 'isDirectory' does not exist on type 'FileOrDirectory'.
  Property 'isDirectory' does not exist on type 'File'.

325                     if (item.isDirectory) {

src/test/fixtures/fern/basic-auth/sdk-basic-auth.test.ts:1:27 - error TS2307: Cannot find module '../src' or its corresponding type declarations.

1 import { BasicAuth } from '../src';

[wwzeng1]

src/SdkGeneratorCli.ts:116:52 - error TS2339: Property 'getModules' does not exist on type 'PersistedTypescriptProject'.

116 const modules = persistedTypescriptProject.getModules();

src/__test__/generate.test.ts:326:30 - error TS2339: Property 'isDirectory' does not exist on type 'FileOrDirectory'.
  Property 'isDirectory' does not exist on type 'File'.

326                     if (item.isDirectory) {

src/test/fixtures/fern/basic-auth/sdk-basic-auth.test.ts:1:27 - error TS2307: Cannot find module '../../src' or its corresponding type declarations.

1 import { BasicAuth } from '../../src';

Found 3 errors.

Exited with code exit status 2