Implement basic benchmarks

Pre 2.0.0 instance methods vs >2.0.0 static methods

Author: cblanc

benchmark.js

@@ -0,0 +1,44 @@
+"use strict";
+const inv = require("install-npm-version");
+const benchmarkVersion = "1.0.1";
+const benchmarkLib = `postcode@${benchmarkVersion}`;
+
+const message = `
+	Benchmarking master against ${benchmarkLib}
+
+`;
+
+inv
+  .Install(benchmarkLib, { Verbosity: "debug" })
+  .then(() => runBenchmarks())
+  .catch(error => {
+    console.log(error);
+    process.exit(1);
+  });
+
+const runBenchmarks = () => {
+  const { Suite } = require("benchmark");
+  const suite = new Suite();
+
+  const Postcode = require("./dist/index");
+  const PreviousPostcode = require(benchmarkLib);
+
+  const extractInputs = ({ tests }) => tests.map(({ base }) => base);
+
+  const validation = extractInputs(require("./test/data/validation.json"));
+  suite
+    .add(`(version: ${benchmarkVersion}) Postcode#valid`, () => {
+      validation.forEach(postcode => {
+        const result = new PreviousPostcode(postcode).valid();
+      });
+    })
+    .add("(version: master) Postcode.isValid", () => {
+      validation.forEach(postcode => {
+        const result = Postcode.isValid(postcode);
+      });
+    })
+    .on("cycle", event => {
+      console.log(String(event.target));
+    })
+    .run({});
+};