指明要覆盖的方法

@covers 标注（参见 Table B.1, “用于指明测试覆盖哪些方法的标注”）可以用在测试代码中来指明测试方法想要对哪些方法进行测试。如果提供了这个信息，则只有指定方法的代码覆盖率信息会被统计。 Example 11.2, “在测试中指明欲覆盖哪些方法”展示了一个例子。

Example 11.2. 在测试中指明欲覆盖哪些方法

<?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 (BankAccountException $e) {
            $this->assertEquals(0, $this->ba->getBalance());

            return;
        }

        $this->fail();
    }

    /**
     * @covers BankAccount::depositMoney
     */
    public function testBalanceCannotBecomeNegative2()
    {
        try {
            $this->ba->depositMoney(-1);
        }

        catch (BankAccountException $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());
    }
}
?>

同时，可以用 @coversNothing 标注来指明一个测试不覆盖任何方法（参见the section called “@coversNothing”）。这可以在编写集成测试时用于确保代码覆盖全部来自单元测试。

Example 11.3. 指明测试不欲覆盖任何方法

<?php
class GuestbookIntegrationTest extends PHPUnit_Extensions_Database_TestCase
{
    /**
     * @coversNothing
     */
    public function testAddEntry()
    {
        $guestbook = new Guestbook();
        $guestbook->addEntry("suzy", "Hello world!");

        $queryTable = $this->getConnection()->createQueryTable(
            'guestbook', 'SELECT * FROM guestbook'
        );

        $expectedTable = $this->createFlatXmlDataSet("expectedBook.xml")
                              ->getTable("guestbook");

        $this->assertTablesEqual($expectedTable, $queryTable);
    }
}
?>