Add test coverage with nyc

.eslintignore

@@ -1 +1,2 @@
 lib/testpilot/*.js
+coverage

.gitignore

@@ -12,3 +12,7 @@ src/web-ext-artifacts/*
 
 # JetBrains IDE files
 .idea
+
+# IstanbulJS
+.nyc_output
+coverage

package.json

@@ -19,6 +19,7 @@
     "json": "^9.0.6",
     "mocha": "^6.2.2",
     "npm-run-all": "^4.0.0",
+    "nyc": "^14.1.1",
     "sinon": "^7.5.0",
     "sinon-chai": "^3.3.0",
     "stylelint": "^7.9.0",
@@ -42,7 +43,8 @@
     "lint:html": "htmllint *.html",
     "lint:js": "eslint .",
     "package": "rm -rf src/web-ext-artifacts && npm run build && mv src/web-ext-artifacts/firefox_multi-account_containers-*.zip addon.xpi",
-    "test": "npm run lint && mocha ./test/setup.js test/**/*.test.js",
+    "test": "npm run lint && npm run coverage",
-    "test-watch": "mocha ./test/setup.js test/**/*.test.js --watch"
+    "test-watch": "mocha ./test/setup.js test/**/*.test.js --watch",
+    "coverage": "nyc --reporter=html --reporter=text mocha ./test/setup.js test/**/*.test.js --timeout 60000"
   }
 }