Add tests

test/sourcemaps/samples/sourcemap-base-url/_config.js

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+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+module.exports = {
+	description: 'adds a sourcemap base url',
+	options: {
+		output: {
+			sourcemapBaseUrl: 'https://example.com'
+		}
+	},
+	test: (code, map, profile) => {
+		assert.equal(map.file, `bundle.${profile.format}.js`);
+		const bundlePath = path.join(__dirname, `_actual/bundle.${profile.format}.js`);
+		const bundledCode = fs.readFileSync(bundlePath, { encoding: 'utf8', flag: 'r' });
+		const sourceMappingURL = bundledCode.split('\n').slice(-2)[0];
+		assert.equal(
+			sourceMappingURL,
+			`//# sourceMappingURL=https://example.com/bundle.${profile.format}.js.map`
+		);
+	}
+};

test/sourcemaps/samples/sourcemap-base-url/main.js

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+console.log( 42 );