Add initial PHPUnit test infrastructure. (#60)

Signed-off-by: costdev <79332690+costdev@users.noreply.github.com>

wp-tests-config-sample.php

@@ -0,0 +1,43 @@
+<?php
+
+/* Path to the WordPress Core codebase. */
+if ( file_exists( dirname( __DIR__, 2 ) . '/wp-load.php' ) ) {
+	define( 'ABSPATH', dirname( __DIR__, 2 ) . '/');
+} elseif ( file_exists( dirname( __DIR__, 3 ) . '/wp-load.php' ) ) {
+	define( 'ABSPATH', dirname( __DIR__, 3 ) . '/');
+}
+
+// Test with multisite enabled: (previously -m)
+// define( 'WP_TESTS_MULTISITE', true );
+
+// Force known bugs: (previously -f)
+// define( 'WP_TESTS_FORCE_KNOWN_BUGS', true );
+
+// Test with WordPress debug mode on (previously -d)
+// define( 'WP_DEBUG', true );
+
+// ** MySQL settings ** //
+
+// This configuration file will be used by the copy of WordPress being tested.
+// wordpress/wp-config.php will be ignored.
+
+// WARNING WARNING WARNING!
+// These tests will DROP ALL TABLES in the database with the prefix named below.
+// DO NOT use a production database or one that is shared with something else.
+
+define( 'DB_NAME', 'tests-wordpress' );
+define( 'DB_USER', 'root' );
+define( 'DB_PASSWORD', 'password' );
+define( 'DB_HOST', 'tests-mysql' );
+define( 'DB_CHARSET', 'utf8' );
+define( 'DB_COLLATE', '' );
+
+$table_prefix  = 'wptests_';   // Only numbers, letters, and underscores please!
+
+define( 'WP_TESTS_DOMAIN', 'example.org' );
+define( 'WP_TESTS_EMAIL', 'admin@example.org' );
+define( 'WP_TESTS_TITLE', 'Test Blog' );
+
+define( 'WP_PHP_BINARY', 'php' );
+
+define( 'WPLANG', '' );