Tests: Setup PHPUnit and PHPUnit Watcher.

plugins/wporg-5ftf/.gitignore

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+vendor

plugins/wporg-5ftf/composer.json

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+{
+	"name"        : "wordpress/five-for-the-future",
+	"description" : "Five for the Future plugin",
+	"license"     : "GPL-2.0-or-later",
+
+	"authors" : [
+		{
+			"name"  : "WordPress",
+			"email" : "support@wordcamp.org"
+		}
+	],
+
+	"config" : {
+		"_comment": "Work around `test:watch` timeout, see https://github.com/spatie/phpunit-watcher/issues/63#issuecomment-545633709",
+		"process-timeout": 0
+	},
+
+	"require"     : { },
+	"require-dev" : {
+		"phpunit/phpunit"        : "^7",
+		"spatie/phpunit-watcher" : "^1.12"
+	},
+
+	"scripts" : {
+		"test"       : "vendor/bin/phpunit",
+		"test:watch" : "vendor/bin/phpunit-watcher watch"
+	}
+}

plugins/wporg-5ftf/phpunit-watcher.yml.dist

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+watch:
+  directories:
+    # By default only the `tests/` folder is watched, but the empty value below represents the current directory,
+    # so that tests will also re-run when the files-under-test are changed.
+    -
+  fileMask: '*.php'
+
+notifications:
+  passingTests: false
+  failingTests: false
+
+phpunit:
+  binaryPath: vendor/bin/phpunit

plugins/wporg-5ftf/phpunit.xml.dist

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+<phpunit
+	bootstrap="tests/bootstrap.php"
+	backupGlobals="false"
+	colors="true"
+	convertErrorsToExceptions="true"
+	convertNoticesToExceptions="true"
+	convertWarningsToExceptions="true"
+	>
+
+	<testsuites>
+		<testsuite name="Five for the Future plugin">
+			<directory prefix="test-" suffix=".php">
+				./tests/
+			</directory>
+		</testsuite>
+	</testsuites>
+</phpunit>

plugins/wporg-5ftf/tests/bootstrap.php

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+<?php
+
+namespace WordPressDotOrg\FiveForTheFuture\Tests;
+
+if ( 'cli' !== php_sapi_name() ) {
+	return;
+}
+
+
+define( 'WP_PLUGIN_DIR', dirname( dirname( __DIR__ ) ) );
+
+
+$core_tests_directory = getenv( 'WP_TESTS_DIR' );
+
+if ( ! $core_tests_directory ) {
+	echo "\nPlease set the WP_TESTS_DIR environment variable to the folder where WordPress' PHPUnit tests live --";
+	echo "\ne.g., export WP_TESTS_DIR=/srv/www/wordpress-develop/tests/phpunit\n";
+
+	return;
+}
+
+require_once( $core_tests_directory . '/includes/functions.php' );
+require_once( dirname( dirname( $core_tests_directory ) ) . '/build/wp-admin/includes/plugin.php' );
+
+tests_add_filter( 'muplugins_loaded', function() {
+	require_once( dirname( __DIR__ )  . '/index.php' );
+} );
+
+require_once( $core_tests_directory . '/includes/bootstrap.php' );