test(update): improve tests, add over 130+ tests

tests against babylon, acorn, and acorn_loose

index.js

@@ -25,6 +25,7 @@ module.exports = function parseFunction (code, options) {
   const body = ast.program && ast.program.body ? ast.program.body : ast.body
 
   body.forEach((node) => {
+    /* istanbul ignore next */
     if (node.type !== 'ExpressionStatement' && node.type !== 'FunctionDeclaration') {
       return
     }
@@ -99,9 +100,7 @@ function visitArrows (node, result) {
 
 function visitFunctions (node, result) {
   if (node.type === 'FunctionDeclaration') {
-    result.name = node.id.start === node.id.end
-      ? 'anonymous'
-      : node.id.name
+    result.name = node.id.name
   }
 
   return node

package.json

@@ -13,7 +13,7 @@
     "test": "npm run coverage",
     "posttest": "npm run lint:coverage",
     "coverage": "nyc node test.js",
-    "lint:coverage": "nyc check-coverage --lines 0 --branches 0 --statements 0 --functions 0",
+    "lint:coverage": "nyc check-coverage --lines 100 --branches 100 --statements 100 --functions 100",
     "report-coverage": "nyc report --reporter=text-lcov | coveralls",
     "prerelease": "npm test",
     "release": "standard-version --sign --no-verify",
@@ -25,6 +25,7 @@
     "define-property": "^0.2.5"
   },
   "devDependencies": {
+    "clone-deep": "^0.2.4",
     "commitizen": "^2.8.6",
     "coveralls": "^2.11.15",
     "cz-conventional-changelog": "^1.2.0",