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Filename : BankAccountTest.php
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<?php
require_once 'BankAccount.php';

class BankAccountTest extends PHPUnit_Framework_TestCase
{
    protected $ba;

    protected function setUp()
    {
        $this->ba = new BankAccount;
    }

    /**
     * @covers BankAccount::getBalance
     */
    public function testBalanceIsInitiallyZero()
    {
        $this->assertEquals(0, $this->ba->getBalance());
    }

    /**
     * @covers BankAccount::withdrawMoney
     */
    public function testBalanceCannotBecomeNegative()
    {
        try {
            $this->ba->withdrawMoney(1);
        } catch (RuntimeException $e) {
            $this->assertEquals(0, $this->ba->getBalance());

            return;
        }

        $this->fail();
    }

    /**
     * @covers BankAccount::depositMoney
     */
    public function testBalanceCannotBecomeNegative2()
    {
        try {
            $this->ba->depositMoney(-1);
        } catch (RuntimeException $e) {
            $this->assertEquals(0, $this->ba->getBalance());

            return;
        }

        $this->fail();
    }

    /**
     * @covers BankAccount::getBalance
     * @covers BankAccount::depositMoney
     * @covers BankAccount::withdrawMoney
     */
    public function testDepositWithdrawMoney()
    {
        $this->assertEquals(0, $this->ba->getBalance());
        $this->ba->depositMoney(1);
        $this->assertEquals(1, $this->ba->getBalance());
        $this->ba->withdrawMoney(1);
        $this->assertEquals(0, $this->ba->getBalance());
    }
}