Extra tests / wpdb

tests/phpunit/tests/db/magicmethods.php

@@ -43,6 +43,65 @@ private function get_clean_wpdb() {
 		return $mock_obj;
 	}
 
+	/**
+	 * Verify that public properties are not affected by the changes made in the magic methods.
+	 *
+	 * @ticket 56034
+	 *
+	 * @coversNothing
+	 *
+	 * @dataProvider data_public_properties_are_not_affected_by_changes_in_magic_methods
+	 *
+	 * @param string $name    Property name.
+	 * @param mixed  $default Default value for the property.
+	 */
+	public function test_public_properties_are_not_affected_by_changes_in_magic_methods( $name, $default = null ) {
+		$obj = $this->get_clean_wpdb();
+
+		// Verify initial state.
+		if ( null !== $default ) {
+			$this->assertTrue( isset( $obj->$name ), 'Unexpected initial state' );
+			$this->assertSame( $default, $obj->$name, 'Initial value does not match expectations' );
+		} else {
+			$this->assertFalse( isset( $obj->$name ), 'Unexpected initial state' );
+			$this->assertNull( $obj->$name, 'Initial value does not match expectations' );
+		}
+
+		// Overwrite the property value and verify the new state.
+		$obj->$name = self::TEST_VALUE_1;
+		$this->assertTrue( isset( $obj->$name ), 'Setting the property failed [1]' );
+		$this->assertSame( self::TEST_VALUE_1, $obj->$name, 'Property has not been assigned the first value' );
+
+		// Unset the property and verify the new state.
+		unset( $obj->$name );
+		$this->assertFalse( isset( $obj->$name ), 'Unsetting the property failed' );
+
+		// Set the property again and verify the updated state.
+		$obj->$name = self::TEST_VALUE_2;
+		$this->assertTrue( isset( $obj->$name ), 'Setting the property failed [2]' );
+		$this->assertSame( self::TEST_VALUE_2, $obj->$name, 'Property has not been assigned the second value' );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array
+	 */
+	public function data_public_properties_are_not_affected_by_changes_in_magic_methods() {
+		return array(
+			'Declared public property: $show_errors (has default value)'   => array(
+				'name'    => 'show_errors',
+				'default' => false,
+			),
+			'Declared public property: $charset (no default value)' => array(
+				'name' => 'charset',
+			),
+			'Declared public property: $is_mysql (has default value: null)' => array(
+				'name' => 'is_mysql',
+			),
+		);
+	}
+
 	/**
 	 * @ticket 18510
 	 */