Setup PHPUnit

package.json

@@ -45,6 +45,7 @@
 		"plugin-zip": "wp-scripts plugin-zip",
 		"start": "wp-scripts start --webpack-copy-php",
 		"start:hot": "wp-scripts start --hot",
+    "test:unit": "wp-env run tests-cli --env-cwd=wp-content/plugins/write-poetry ./vendor/bin/phpunit",
 		"wp-env": "wp-env",
 		"env:start": "wp-env start && (npm run start)",
 		"env:start:debug": "wp-env start --xdebug",

phpunit.xml.dist

@@ -1,3 +1,4 @@
+<?xml version="1.0"?>
 <phpunit
 	bootstrap="tests/bootstrap.php"
 	backupGlobals="false"
@@ -7,8 +8,9 @@
 	convertWarningsToExceptions="true"
 	>
 	<testsuites>
-		<testsuite>
+		<testsuite name="testing">
 			<directory prefix="test-" suffix=".php">./tests/</directory>
+			<exclude>./tests/test-sample.php</exclude>
 		</testsuite>
 	</testsuites>
 </phpunit>

tests/bootstrap.php

@@ -1,8 +1,8 @@
 <?php
 /**
- * PHPUnit bootstrap file
+ * PHPUnit bootstrap file.
  *
- * @package Sample_Plugin
+ * @package WritePoetry
  */
 
 $_tests_dir = getenv( 'WP_TESTS_DIR' );
@@ -11,21 +11,28 @@
 	$_tests_dir = rtrim( sys_get_temp_dir(), '/\\' ) . '/wordpress-tests-lib';
 }
 
-if ( ! file_exists( $_tests_dir . '/includes/functions.php' ) ) {
-	echo "Could not find $_tests_dir/includes/functions.php, have you run bin/install-wp-tests.sh ?";
+// Forward custom PHPUnit Polyfills configuration to PHPUnit bootstrap file.
+$_phpunit_polyfills_path = getenv( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' );
+if ( false !== $_phpunit_polyfills_path ) {
+	define( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH', $_phpunit_polyfills_path );
+}
+
+if ( ! file_exists( "{$_tests_dir}/includes/functions.php" ) ) {
+	echo "Could not find {$_tests_dir}/includes/functions.php, have you run bin/install-wp-tests.sh ?" . PHP_EOL; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 	exit( 1 );
 }
 
 // Give access to tests_add_filter() function.
-require_once $_tests_dir . '/includes/functions.php';
+require_once "{$_tests_dir}/includes/functions.php";
 
 /**
  * Manually load the plugin being tested.
  */
 function _manually_load_plugin() {
-	require dirname( __DIR__ ) . '/sample-plugin.php';
+	require dirname( dirname( __FILE__ ) ) . '/write-poetry.php';
 }
+
 tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
 
 // Start up the WP testing environment.
-require $_tests_dir . '/includes/bootstrap.php';
+require "{$_tests_dir}/includes/bootstrap.php";

tests/test-sample.php

@@ -2,7 +2,7 @@
 /**
  * Class SampleTest
  *
- * @package Sample_Plugin
+ * @package Write_Poetry
  */
 
 /**
@@ -13,7 +13,7 @@ class SampleTest extends WP_UnitTestCase {
 	/**
 	 * A single example test.
 	 */
-	function test_sample() {
+	public function test_sample() {
 		// Replace this with some actual testing code.
 		$this->assertTrue( true );
 	}