test(credential-provider-node): add integ test for default credential chain (#5764)

* test(credential-provider-node): add integ test for default credential chain

* test: more scenarios

* test: additional testcases

Author: kuhe

packages/credential-provider-node/jest.config.integ.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: "ts-jest",
+  testMatch: ["**/*.integ.spec.ts"],
+};

packages/credential-provider-node/package.json

@@ -15,7 +15,8 @@
     "build:types": "tsc -p tsconfig.types.json",
     "build:types:downlevel": "downlevel-dts dist-types dist-types/ts3.4",
     "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo",
-    "test": "jest"
+    "test": "jest",
+    "test:integration": "jest -c jest.config.integ.js"
   },
   "keywords": [
     "aws",