Setup for L0 Testcases (#6)

* SetUp for L0 TestCases

* Issue Fix

* Issue Fix

* Issue Fix

* Issue Fix

* Issue Fix

* Issue Fix

* Review comments fix: run npm install only with our build, npm install only dev for releases

* Running code covrage only on PR of master and releases

package.json

@@ -4,7 +4,9 @@
     "private": true,
     "main": "lib/run.js",
     "scripts": {
-        "build": "tsc --outDir .\\lib\\ --rootDir .\\src\\"
+        "build": "tsc --outDir .\\lib\\ --rootDir .\\src\\",
+        "test": "jest",
+        "test-coverage": "jest --coverage"
     },
     "keywords": [
         "actions",
@@ -19,6 +21,10 @@
         "@actions/tool-cache": "^1.0.0"
     },
     "devDependencies": {
-        "@types/node": "^12.0.4"
+        "@types/node": "^12.0.4",
+        "jest": "^26.0.1",
+        "@types/jest": "^25.2.2",
+        "ts-jest": "^25.5.1",
+        "typescript": "3.9.2"
     }
 }