test: add missing test config

Author: merceyz

Diff for: .vscode/launch.json

@@ -0,0 +1,15 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Debug test",
+      "program": "${workspaceRoot}/node_modules/jest/bin/jest.js",
+      "args": ["test/index.test.ts"]
+    }
+  ]
+}

Diff for: jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

Diff for: test/index.test.ts

@@ -0,0 +1,10 @@
+import * as ttp from '../src';
+import path from 'path';
+
+it('runs', () => {
+  const tsconfig = ttp.loadConfig(path.resolve(__dirname, '../tsconfig.json'));
+
+  const parsed = ttp.parseFile(path.resolve(__dirname, 'testFile.d.ts'), tsconfig);
+
+  expect(parsed).toMatchSnapshot();
+});

Diff for: test/testFile.d.ts

@@ -0,0 +1,7 @@
+import * as React from 'react';
+
+type FooProps = {
+  bar: string;
+};
+
+export default function Foo(props: FooProps): JSX.Element;