Add test coverage report (#2449)

.gitignore

@@ -20,3 +20,6 @@ typings/.basedir.ts
 
 docs/_data/rules.json
 docs/rules/*/index.html
+
+/coverage/
+/.nyc_output

.npmignore

@@ -19,3 +19,5 @@ yarn.lock
 /src/
 /test/
 tscommand*.txt
+/coverage/
+/.nyc_output

.nycrc

@@ -0,0 +1,17 @@
+{
+    "include": [
+        "build/**/*.js"
+    ],
+    "extension": [
+        ".js"
+    ],
+    "exclude": [
+        "build/test"
+    ],
+    "reporter": [
+        "text-summary",
+        "html"
+    ],
+    "sourceMap": true,
+    "all": true
+}

package.json

@@ -32,7 +32,8 @@
     "test:pre": "cd ./test/config && npm install",
     "test:mocha": "mocha --reporter spec --colors \"build/test/**/*Tests.js\"",
     "test:rules": "node ./build/test/ruleTestRunner.js",
-    "verify": "npm-run-all clean compile lint test docs"
+    "verify": "npm-run-all clean compile lint test docs",
+    "coverage": "rimraf coverage .nyc_output && nyc npm test"
   },
   "dependencies": {
     "babel-code-frame": "^6.22.0",
@@ -67,6 +68,7 @@
     "js-yaml": "^3.7.0",
     "mocha": "^3.2.0",
     "npm-run-all": "^3.1.0",
+    "nyc": "^10.2.0",
     "rimraf": "^2.5.4",
     "tslint": "latest",
     "tslint-test-config-non-relative": "file:test/external/tslint-test-config-non-relative",