add tests

.gitignore

@@ -0,0 +1 @@
+node_modules

examples/one.ts

@@ -0,0 +1,23 @@
+const obj = {
+  one: 1,
+  two: 2,
+  three: 3,
+}
+
+;('this config avoids semicolons at the end of statements and uses single quotes for strings')
+
+async function heresAFunctionWhichSpansMulitpleLinesAnd(
+  that,
+  includes,
+  many,
+  args,
+  to,
+  demonstrait,
+  trailing,
+  func,
+  commas
+) {
+  return obj
+}
+
+const arrowFunctions = avoidParens => 1

package-lock.json

@@ -7,7 +7,33 @@
     "": {
       "name": "@github/prettier-config",
       "version": "0.0.4",
-      "license": "MIT"
+      "license": "MIT",
+      "devDependencies": {
+        "prettier": "^2.8.0"
+      }
+    },
+    "node_modules/prettier": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.0.tgz",
+      "integrity": "sha512-9Lmg8hTFZKG0Asr/kW9Bp8tJjRVluO8EJQVfY2T7FMw9T5jy4I/Uvx0Rca/XWf50QQ1/SS48+6IJWnrb+2yemA==",
+      "dev": true,
+      "bin": {
+        "prettier": "bin-prettier.js"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    }
+  },
+  "dependencies": {
+    "prettier": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.0.tgz",
+      "integrity": "sha512-9Lmg8hTFZKG0Asr/kW9Bp8tJjRVluO8EJQVfY2T7FMw9T5jy4I/Uvx0Rca/XWf50QQ1/SS48+6IJWnrb+2yemA==",
+      "dev": true
     }
   }
 }

package.json

@@ -13,6 +13,11 @@
   "author": "GitHub Inc.",
   "main": "index.js",
   "scripts": {
+    "test:update": "prettier --config ./index.js --write examples/",
+    "test": "prettier --config ./index.js --check examples/",
     "postpublish": "npm publish --ignore-scripts --@github:registry='https://npm.pkg.github.com'"
+  },
+  "devDependencies": {
+    "prettier": "^2.8.0"
   }
 }