Postfix test files with _test

package.json

@@ -15,7 +15,7 @@
     "build:commonjs": "tsc; copyfiles -u 2 ./src/artifacts/*.json ./../0x.js/lib/src/artifacts;",
     "build": "npm run clean && run-p build:*",
     "lint": "tslint src/ts/**/*",
-    "test": "run-s clean build:commonjs && mocha lib/test/**/*.js",
+    "test": "run-s clean build:commonjs && mocha lib/test/**/*_test.js",
     "test:coverage": "nyc npm run test --all",
     "docs:json": "typedoc --json docs/index.json .",
     "docs:generate": "typedoc --out docs .",