Testing with a Context object

[aantia]

There are a couple of issues requesting that the Context class be exported for writing tests that need a Context as input: #4195, #3988.

Here's a simple workaround:

const req = new Request('http://localhost/notarealpath');
let context: Context<Env, string, {}>;
const app = new Hono().get('*', (c) => {
	context = c;
	return c.body('Test');
});
await app.request(req);

Here's a fuller example (using the app factory pattern so that the type of my context matches the expected input of the function being tested):

it('should throw forbiddenError if user lacks permissions', async () => {
	const req = new Request('http://localhost/v1/accounts');
	let context: Context<RootEnv, string, {}>;
	const jwtPayload = {
		type: 'role_access',
		sub: 'role_id',
		iss: 'https://example.com',
		aud: 'my-api',
		iat: 1,
		exp: 2,
		jti: 'uuid',
		scope: Permission.MERCHANTS_READ,
		act: {
			sub: 'user_id',
		}
	};
	const app = factory.createApp().get('/v1/accounts', (c) => {
		c.set('jwtPayload', jwtPayload);
		context = c;
		return c.body('Test');
	});
	await app.request(req);

	const permissions = [Permission.ACCOUNTS_READ];
	assert.throws(() => checkJwtPermissions(context!, permissions), {
		status: 403,
	});
});