Add in some functional tests, using Lerna to manage the dependencies …

…of each test 'repo'

.gitignore

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 node_modules
+lerna-debug.log

.npmignore

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+examples/
+.prettierrc
+__tests__/

__tests__/common/app.js

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+require("./constants");
+require("./styles.css");
+
+console.log("Some javascript", FOO);

__tests__/common/constants.js

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+const a = 1;

__tests__/common/smp.test.js

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+const SpeedMeasurePlugin = require("../../..");
+const webpack = require("webpack");
+const { readFileSync } = require("fs");
+const webpackConfig = require("./webpack.config");
+
+const genSmpWebpackConfig = smp =>
+  smp.wrap(
+    Object.assign({}, webpackConfig, {
+      output: {
+        path: webpackConfig.output.path + "/_smp_" + new Date().getTime(),
+      },
+    })
+  );
+
+const runWebpack = config =>
+  new Promise((resolve, reject) => {
+    webpack(config, (err, stats) => {
+      if (err || stats.hasErrors()) return reject(err || stats);
+      resolve(readFileSync(config.output.path + "/bundle.js").toString());
+    });
+  });
+
+describe("smp - " + __dirname.split("/").pop(), () => {
+  let distApp;
+  beforeAll(() => runWebpack(webpackConfig).then(file => (distApp = file)));
+
+  describe("vanilla config", () => {
+    let smpOutput;
+    let smpDistApp;
+    const smp = new SpeedMeasurePlugin({
+      outputTarget: output => (smpOutput = output),
+    });
+    const smpWebpackConfig = genSmpWebpackConfig(smp);
+
+    beforeAll(() =>
+      runWebpack(smpWebpackConfig).then(file => (smpDistApp = file))
+    );
+
+    it("should generate the same app.js content", () => {
+      expect(smpDistApp).toEqual(distApp);
+    });
+
+    it("should generate the same app.js content after 2 runs", () => {
+      const dupSmpWebpackConfig = genSmpWebpackConfig(smp);
+
+      return runWebpack(dupSmpWebpackConfig).then(dupSmpDistApp => {
+        expect(dupSmpDistApp).toEqual(smpDistApp);
+        expect(dupSmpDistApp).toEqual(distApp);
+      });
+    });
+
+    it("should state the time taken overall", () => {
+      expect(smpOutput).toMatch(
+        /General output time took .*([0-9]+ mins? )?[0-9]+(\.[0-9]+)? secs/
+      );
+    });
+
+    it("should state the time taken by the plugins", () => {
+      expect(smpOutput).toMatch(
+        /DefinePlugin.* took .*([0-9]+ mins? )?[0-9]+(\.[0-9]+)? secs/
+      );
+    });
+
+    it("should state the time taken by the loaders", () => {
+      expect(smpOutput).toMatch(
+        /babel-loader.* took .*([0-9]+ mins? )?[0-9]+(\.[0-9]+)? secs.*\n\s+module count\s+= [0-9]+/
+      );
+    });
+  });
+});

__tests__/common/styles.css

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+.a {
+  color: red;
+}

__tests__/setups/.gitignore

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+app.js
+constants.js
+styles.css
+smp.test.js
+dist

__tests__/setups/.prettierrc

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+{
+	"trailingComma": "es5"
+}