Add tests

Author: giuseppeg

test/cases/insert-function/expected/main.css

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+body {
+  background: red;
+}
+

test/cases/insert-function/index.js

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+import './style.css';

test/cases/insert-function/insert-function.test.js

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+/* globals document, getComputedStyle */
+
+import path from 'path';
+
+import webpack from 'webpack';
+
+import config from './webpack.config';
+
+describe('options.insert as a function', () => {
+  it('inserts the bundle on the page', (done) => {
+    const outputPath = path.resolve(__dirname, 'expected/index.js');
+    webpack({
+      ...config,
+      output: {
+        path: outputPath,
+        libraryTarget: 'umd',
+        library: 'mini',
+      },
+    }).run(() => {
+      let computedValue = getComputedStyle(document.body).backgroundColor;
+      expect(computedValue).toBe('');
+
+      const script = document.createElement('script');
+      script.src = outputPath;
+      document.head.appendChild(script);
+
+      computedValue = getComputedStyle(document.body).backgroundColor;
+      expect(computedValue).toBe('rgba(0, 0, 0, 0)');
+
+      done();
+    });
+  });
+});

test/cases/insert-function/style.css

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+body {
+  background: red;
+}

test/cases/insert-function/webpack.config.js

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+/* globals document */
+import Self from '../../../src';
+
+module.exports = {
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  plugins: [
+    new Self({
+      filename: '[name].css',
+      insert: function insert(linkTag) {
+        document.head.appendChild(linkTag);
+      },
+    }),
+  ],
+};

test/cases/insert-string/expected/main.css

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+body {
+  background: red;
+}
+

test/cases/insert-string/index.js

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+import './style.css';

test/cases/insert-string/style.css

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+body {
+  background: red;
+}

test/cases/insert-string/webpack.config.js

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+import Self from '../../../src';
+
+module.exports = {
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [Self.loader, 'css-loader'],
+      },
+    ],
+  },
+  plugins: [
+    new Self({
+      filename: '[name].css',
+      insert: 'head',
+    }),
+  ],
+};