chore: import stainless tests.

PiperOrigin-RevId: 911391884

Author: MarkDaoust

.github/workflows/test.yml

@@ -26,6 +26,7 @@ jobs:
     - run: USE_LOCAL_BUILD=true npm ci
     - run: npm run build
     - run: npm run unit-test
+    - run: npm run test:interactions
     - run: npm run test-server-tests
     - run: |
         cd sdk-samples

jest.config.cjs

@@ -0,0 +1,5 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testMatch: ['**/test/unit/interactions/**/*.test.ts'],
+};