test: enforce 100% coverage on CI (#37)

Author: Thomas Lombart

jest.config.js

@@ -1,3 +1,11 @@
 module.exports = {
   testMatch: ['**/tests/**/*.js'],
+  coverageThreshold: {
+    global: {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
+  },
 };

package-lock.json

@@ -28,7 +28,9 @@
     "lint": "eslint ./",
     "lint:fix": "npm run lint -- --fix",
     "format": "prettier --write README.md {lib,docs,tests}/**/*.{js,md}",
-    "test": "jest",
+    "test:local": "jest",
+    "test:ci": "jest --coverage",
+    "test": "is-ci test:ci test:local",
     "semantic-release": "semantic-release"
   },
   "dependencies": {},
@@ -46,6 +48,7 @@
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
     "husky": "^3.0.5",
+    "is-ci-cli": "^2.0.0",
     "jest": "^24.9.0",
     "lint-staged": "^9.2.5",
     "prettier": "1.18.2",