Add unit tests for role middleware

node_modules/collect-v8-coverage/README.md

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+# collect-v8-coverage
+
+Use this module to start and stop the V8 inspector manually and collect precise coverage.
+
+```js
+const {CoverageInstrumenter} = require('collect-v8-coverage');
+
+const instrumenter = new CoverageInstrumenter();
+
+await instrumenter.startInstrumenting();
+
+// require some modules, run some code
+
+const coverage = await instrumenter.stopInstrumenting();
+```