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* Class Jetpack_Constants
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* Testing constants is hard. Once you define a constant, it's defined. Jetpack_Constants is an
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* abstraction layer so that unit tests can set "constants" for tests.
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* To test your code, you'll need to swap out `defined( 'CONSTANT' )` with `Jetpack_Constants::is_defined( 'CONSTANT' )`
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* and replace `CONSTANT` with `Jetpack_Constants::get_constant( 'CONSTANT' )`. Then in the unit test, you can set the
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* constant with `Jetpack::set_constant( 'CONSTANT', $value )` and then clean up after each test with something like
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* function tearDown() {
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* Jetpack_Constants::clear_constants();
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class Jetpack_Constants {
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static $set_constants = array();
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* Checks if a "constant" has been set in Jetpack_Constants, and if not,
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* checks if the constant was defined with define( 'name', 'value ).
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* @param $name string The name of the constant
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public static function is_defined( $name ) {
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return array_key_exists( $name, self::$set_constants )
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* Attempts to retrieve the "constant" from Jetpack_Constants, and if it hasn't been set,
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* then attempts to get the constant with the constant() function.
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* @return mixed null if the constant does not exist or the value of the constant.
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public static function get_constant( $name ) {
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if ( array_key_exists( $name, self::$set_constants ) ) {
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return self::$set_constants[ $name ];
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return defined( $name ) ? constant( $name ) : null;
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* Sets the value of the "constant" within Jetpack_Constants.
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* @param $name string The name of the "constant"
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* @param $value string The value of the "constant"
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public static function set_constant( $name, $value ) {
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self::$set_constants[ $name ] = $value;
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* Will unset a "constant" from Jetpack_Constants if the constant exists.
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* @param $name string The name of the "constant"
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* @return bool Whether the constant was removed.
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public static function clear_single_constant( $name ) {
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if ( ! array_key_exists( $name, self::$set_constants ) ) {
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unset( self::$set_constants[ $name ] );
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* Resets all of the constants within Jetpack_Constants.
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public static function clear_constants() {
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self::$set_constants = array();