A great starting point.

.gitignore

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+.DS_Store

assets/css/index.php

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+<?php

assets/js/index.php

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+<?php

includes/README.md

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+# Add a new App class
+
+To add a new class, simply create your file in this directory,
+e.g. `class-something.php` and now when you attach it to `App` it will
+be auto-loaded.

includes/class-app.php

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+<?php
+/**
+ * Main Application Instance.
+ *
+ * @since Unknown
+ * @package  Company/Package
+ */
+
+namespace Company\Package;
+use Exception;
+
+/**
+ * Application Loader.
+ *
+ * Everything starts here. If you create a new class,
+ * attach it to this class.
+ *
+ * @author Unknown
+ * @since Unknown
+ */
+class App {
+
+	/**
+	 * Plugin basename.
+	 *
+	 * @author Unknown
+	 * @var    string
+	 * @since Unknown
+	 */
+	protected $basename = '';
+
+	/**
+	 * URL of plugin directory.
+	 *
+	 * @author Unknown
+	 * @var    string
+	 * @since Unknown
+	 */
+	protected $url = '';
+
+	/**
+	 * Path of plugin directory.
+	 *
+	 * @author Unknown
+	 * @var    string
+	 * @since Unknown
+	 */
+	protected $path = '';
+
+	/**
+	 * Construct.
+	 *
+	 * @author Unknown
+	 * @since Unknown
+	 *
+	 * @param string $plugin_file The plugin file, usually __FILE__ of the base plugin.
+	 *
+	 * @throws Exception If $plugin_file parameter is invalid (prevents plugin from loading).
+	 */
+	public function __construct( $plugin_file ) {
+
+		// Check input validity.
+		if ( empty( $plugin_file ) || ! stream_resolve_include_path( $plugin_file ) ) {
+
+			// Translators: Displays a message if a plugin file is not passed.
+			throw new Exception( sprintf( esc_html__( 'Invalid plugin file %1$s supplied to %2$s', 'company-package' ), $plugin_file, __METHOD__ ) );
+		}
+
+		// Plugin setup.
+		$this->basename = plugin_basename( $plugin_file );
+		$this->url      = plugin_dir_url( $plugin_file );
+		$this->path     = plugin_dir_path( $plugin_file );
+
+		// Loaders.
+		$this->auto_loader();
+		$this->attach();
+	}
+
+	/**
+	 * Register the autoloader.
+	 *
+	 * @since Unknown
+	 * @author Unknown
+	 */
+	private function auto_loader() {
+
+		// Register our autoloader.
+		spl_autoload_register( array( $this, 'autoload' ) );
+	}
+
+	/**
+	 * Require classes.
+	 *
+	 * @author Unknown
+	 * @since Unknown
+	 *
+	 * @param string $class_name Fully qualified name of class to try and load.
+	 *
+	 * @return  void Early exit if we can't load the class.
+	 */
+	public function autoload( $class_name ) {
+
+		// If our class doesn't have our namespace, don't load it.
+		if ( 0 !== strpos( $class_name, 'Company\\Package\\' ) ) {
+			return;
+		}
+
+		$parts = explode( '\\', $class_name );
+
+		// Include our file.
+		$includes_dir = trailingslashit( $this->path ) . 'includes/';
+		$file         = 'class-' . strtolower( end( $parts ) ) . '.php';
+
+		if ( stream_resolve_include_path( $includes_dir . $file ) ) {
+			require_once $includes_dir . $file;
+		}
+	}
+
+	/**
+	 * Load and attach app elements to the app class.
+	 *
+	 * Make your classes/element small and do only one thing. If you
+	 * need to pass $this to it so you can access other classes
+	 * functionality.
+	 *
+	 * When you add something that gets attached
+	 *
+	 * @author Unknown
+	 * @since Unknown
+	 */
+	private function attach() {
+		$this->shared = new Shared();
+	}
+
+	/**
+	 * This plugin's url.
+	 *
+	 * @author Unknown
+	 * @since Unknown
+	 *
+	 * @param  string $path (Optional) appended path.
+	 * @return string       URL and path.
+	 */
+	public function url( $path = '' ) {
+		return is_string( $path ) && ! empty( $path ) ?
+			trailingslashit( $this->url ) . $path :
+			trailingslashit( $this->url );
+	}
+
+	/**
+	 * Re-attribute user content to site author.
+	 *
+	 * @author Unknown
+	 * @author Unknown
+	 *
+	 * @since Unknown
+	 */
+	public function deactivate_plugin() {
+	}
+}

includes/class-shared.php

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+<?php
+/**
+ * Shared functionality.
+ *
+ * @since Unknown
+ * @package  Company/Package
+ */
+
+namespace Company\Package;
+
+/**
+ * Shared functionality between several areas.
+ *
+ * @author Unknown
+ * @since Unknown
+ */
+class Shared {
+}

includes/index.php

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+<?php

index.php

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+<?php

plugin-name.php

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+<?php
+/**
+ * Plugin Name:
+ * Plugin URI:
+ * Description:
+ * Version:
+ * Author:
+ * Author URI:
+ * License:
+ * License URI:
+ * Text Domain:
+ * Network:
+ *
+ * @since Unknown
+ * @package  Company/Package
+ */
+
+// Our namespace.
+namespace Company\Package;
+
+// Classes outside our namespace.
+use Exception;
+
+// Require the App class.
+require_once 'includes/class-app.php';
+
+/**
+ * Helper function to access the application instance for the Client Plugin.
+ *
+ * @author Unknown
+ * @since Unknown
+ *
+ * @return App|null App if success, null if exception caught (error will be logged).
+ */
+function app() {
+	static $app;
+
+	if ( ! $app instanceof App ) {
+
+		// Start the app.
+		try {
+			$app = new App( __FILE__ );
+		} catch ( Exception $e ) {
+
+			// Catch any errors and log them if debugging is enabled.
+			if ( defined( 'WP_DEBUG' ) && true === WP_DEBUG ) {
+
+				// @codingStandardsIgnoreLine Conditionally debug.
+				error_log( $e->getMessage() );
+			}
+
+			// Return null so no further action can take place.
+			return null;
+		}
+	}
+
+	return $app;
+}
+app(); // Initialize the app.
+
+// When we deactivate this plugin...
+register_deactivation_hook( __FILE__, array( app(), 'deactivate_plugin' ) );

tests/README.md

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+# BEFORE TESTS EXECUTION
+Run this command:
+`bash tests/install-wp-tests.sh wordpress_test root '' localhost latest`
+
+Replace `root` with the username of your database and replace '' with the database password. Also replace `localhost` with the hostname of your database. You can find all three of these values in your wp-config.php file.
+
+You can now type `phpunit` into the command line and the unit tests will run.
+
+Please note, you also might need to modify the path(s) in bootstrap.php with correct path for your WordPress location, it's a known phpunit issue related to git mirroring.
+
+# HOW TO RUN TESTS
+1. Go to plugin folder and execute `phpunit` command. It should start unit testing process and run SampleTest which would return true.

tests/bootstrap.php

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+<?php
+/**
+ * PHPUnit bootstrap file
+ *
+ * @package Company\Package
+ */
+
+$_tests_dir = getenv( 'WP_TESTS_DIR' );
+if ( ! $_tests_dir ) {
+	$_tests_dir = '/tmp/wordpress-tests-lib';
+}
+
+// Give access to tests_add_filter() function.
+require_once $_tests_dir . '/includes/functions.php';
+
+/**
+ * Manually load the plugin being tested.
+ */
+function _manually_load_plugin() {
+	require dirname( dirname( __FILE__ ) ) . '/plugin-name.php';
+}
+tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
+
+// Start up the WP testing environment.
+require $_tests_dir . '/includes/bootstrap.php';

tests/index.php

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+<?php