test(cli): basic cli usage and exceptions

jest.config.ts

@@ -6,6 +6,7 @@ const jestConfig: JestConfigWithTsJest = {
   extensionsToTreatAsEsm: ['.ts'],
   moduleFileExtensions: ['ts', 'js', 'json', 'node'],
   moduleNameMapper: { '(.+)\\.js': '$1' },
+  modulePathIgnorePatterns: ['<rootDir>/dist/', '<rootDir>/public/', '<rootDir>/tmp/'],
   setupFiles: ['<rootDir>/jest.setup.ts'],
   transform: {
     '\\.[jt]s?$': ['ts-jest', { useESM: true }],

public/examples/invalid.yml

@@ -0,0 +1,2 @@
+colllections:
+  - name: noFields

src/cli.spec.ts

@@ -0,0 +1,32 @@
+import { exec as _exec } from 'node:child_process';
+import { promisify } from 'node:util';
+
+const exec = promisify(_exec);
+const cmd = 'node --loader ts-node/esm src/cli.ts';
+
+describe('cli', () => {
+  it('throws an error if no config path is provided', async () => {
+    const runsOrFails = () => exec(`${cmd} -t path/to/target`);
+    await expect(runsOrFails).rejects.toThrow('Missing required argument: --config.');
+  });
+
+  it('throws an error if no target path is provided', async () => {
+    const runsOrFails = () => exec(`${cmd} -c path/to/config.yml`);
+    await expect(runsOrFails).rejects.toThrow('Missing required argument: --target.');
+  });
+
+  it('throws an error if the config path is invalid', async () => {
+    const runsOrFails = () => exec(`${cmd} -c path/to/config.yml -t tmp`);
+    await expect(runsOrFails).rejects.toThrow('Error: File not found: path/to/config.yml');
+  });
+
+  it('does not throw if the config can not be parsed', async () => {
+    const runsOrFails = () => exec(`${cmd} -c public/examples/invalid.yml -t tmp`);
+    await expect(runsOrFails()).resolves.toEqual({ stdout: '', stderr: '' });
+  });
+
+  it('loads and transforms a given config', async () => {
+    const { stdout } = await exec(`${cmd} -c public/examples/blog.yml -t tmp`);
+    expect(stdout).toEqual(expect.stringContaining('> blog schema written to'));
+  });
+});

tsconfig.json

@@ -9,5 +9,10 @@
     "skipLibCheck": true,
     "strict": true,
     "target": "ESNext"
+  },
+  "ts-node": {
+    "experimentalSpecifierResolution": "node",
+    "transpileOnly": true,
+    "esm": true
   }
 }