test: add tests for get-used-version task

package.json

@@ -16,6 +16,7 @@
     "prepublishOnly": "npm ci && npm run build",
     "preversion": "npm run prepublishOnly",
     "push": "git push && git push origin \"v$npm_package_version\"",
+    "test": "nyc mocha --require ts-node/register --ui mocha-typescript 'test/**/*.spec.ts'",
     "tslint": "tslint -p tsconfig.json -c tslint.json 'src/**/*.ts'"
   },
   "author": "Karl-Philipp Wulfert <krlwlfrt@gmail.com>",
@@ -33,14 +34,24 @@
     "@types/glob": "7.1.1",
     "@types/mustache": "0.8.32",
     "@types/node": "10.14.12",
+    "@types/tmp": "0.1.0",
     "commander": "2.20.0",
     "glob": "7.1.4",
     "moment": "2.24.0",
-    "mustache": "3.0.1"
+    "mustache": "3.0.1",
+    "tmp": "0.1.0"
   },
   "devDependencies": {
     "@openstapps/configuration": "0.21.0",
+    "@types/chai": "4.1.7",
+    "@types/chai-as-promised": "7.1.0",
+    "@types/mocha": "5.2.7",
+    "chai": "4.2.0",
+    "chai-as-promised": "7.1.1",
     "conventional-changelog-cli": "2.0.21",
+    "mocha": "6.1.4",
+    "mocha-typescript": "1.1.17",
+    "nyc": "14.1.1",
     "prepend-file-cli": "1.0.6",
     "rimraf": "2.6.3",
     "ts-node": "8.3.0",
@@ -52,5 +63,27 @@
   "typings": "lib/common.d.ts",
   "bin": {
     "openstapps-projectmanagement": "lib/cli.js"
+  },
+  "nyc": {
+    "all": true,
+    "branches": 95,
+    "check-coverage": true,
+    "include": [
+      "src/tasks/get-used-version.ts"
+    ],
+    "extension": [
+      ".ts"
+    ],
+    "functions": 95,
+    "lines": 95,
+    "per-file": true,
+    "reporter": [
+      "html",
+      "text-summary"
+    ],
+    "require": [
+      "ts-node/register"
+    ],
+    "statements": 95
   }
 }