Isolate all TS stuff in hello package

hello/jest.config.js

@@ -0,0 +1,13 @@
+module.exports = {
+  testEnvironment: 'node',
+  preset: "ts-jest",
+  globals: {
+    "ts-jest": {
+      diagnostics: {
+        ignoreCodes: [
+          151001 // see https://githubmemory.com/repo/kulshekhar/ts-jest/issues/2722
+        ]
+      }
+    }
+  }
+}

hello/package.json

@@ -2,6 +2,7 @@
   "name": "@capire/hello-world",
   "version": "1.0.0",
   "scripts": {
+    "test": "npx jest --silent",
     "watch": "cds serve world.cds",
     "watch:ts": "cds-ts serve world.cds"
   },

hello/test/hello-world-ts.test.ts

@@ -0,0 +1,15 @@
+process.env.CDS_TYPESCRIPT = 'true';
+import * as cds from '@sap/cds';
+
+//@ts-ignore
+const {GET} = cds.test.in(__dirname,'..').run('serve', 'world.cds');
+
+describe('Hello world!', () => {
+    afterAll(() => { delete process.env.CDS_TYPESCRIPT; });
+
+    it('should say hello with class impl from a typescript file', async () => {
+        const {data} = await GET`/say/hello(to='world')`
+        expect(data.value).toMatch(/Hello world.*typescript.*/i)
+    })
+
+})