UndoStackTest.php
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	<?php

	namespace AuthGrove\Tests\Undo;

	use AuthGrove\Undo\UndoStack;
	use AuthGrove\Undo\UndoStore;
	use AuthGrove\Tests\TestCase;

	/**
	* Tests for the UndoStack class
	*/
	class UndoStackTest extends TestCase {

	/**
	* The stack to test
	* @var AuthGrove\Undo\UndoStack
	*/
	protected $stack;

	/**
	* An array of three operations to store
	* @var AuthGrove\Undo\UndoStore[]
	*/
	protected $stores = [];

	///
	/// Test preparation
	///

	public function setUp () {
	$this->stack = new UndoStack;

	parent::setUp();
	}

	/**
	* Mocks some undoable operations, stores them,
	* fills the stack with the stores.
	*
	* @param int $amount The amoutn of store to stack
	*/
	public function fillStack ($amount = 3) {
	for ($i = 0 ; $i < $amount ; $i++) {
	$store = static::getUndoStore($i);
	$this->stack->push($store);
	}
	}

	/**
	* Mocks an undoable object and stores it.
	*
	* @param int $id The undoable object's value of the id property
	* @return \AuthGrove\Undo\UndoStore
	*/
	protected static function getUndoStore ($id = 0) {
	return new UndoStore(new UndoableMock($id));
	}

	///
	/// Tests
	///

	public function testUndoLastEmptiesTheStack () {
	$this->fillStack();
	for ($i = 0 ; $i < 3 ; $i++) {
	$this->stack->undoLast();
	}
	$this->assertEquals(0, $this->stack->count());
	}

	/**
	* @expectedException \OutOfBoundsException
	*/
	public function testUndoLastOnAnEmptyStackThrowsException () {
	$this->stack->undoLast();
	}

	/**
	* @expectedException \InvalidArgumentException
	*/
	public function testCorruptedUndoStackThrowsException () {
	$this->stack->push(1); // uh oh, this is an integer, not an UndoStore item!
	$this->stack->undoLast();
	}

	public function testStackIsLIFO () {
	$this->fillStack(); // Stored instance id is 0, 1, 2

	$i = 2; // Should be 2, 1 0
	foreach ($this->stack as $store) {
	$this->assertEquals($i--, $store->getInstance()->id);
	}
	}

	public function testUndo () {
	$store = static::getUndoStore();
	$store->getInstance()->delete();
	$hash = $store->getControlHash();

	$this->stack->push($store);
	$this->stack->undo($hash);

	$this->assertEquals(true, $store->getInstance()->enabled);
	}

	/**
	* @expectedException \OutOfBoundsException
	*/
	public function testUndoThrowsExceptionWhenHashIsInvalid () {
	$this->stack->undo("invalidhash");
	}

	/**
	* @expectedException \OutOfBoundsException
	*/
	public function testUndoThrowsExceptionWhenHashIsNull () {
	$this->stack->undo(null);
	}

	}

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