isNull() public static method

Returns a PHPUnit_Framework_Constraint_IsNull matcher object.
public static isNull ( ) : PHPUnit_Framework_Constraint_IsNull
return PHPUnit_Framework_Constraint_IsNull
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/**
 * Returns a PHPUnit_Framework_Constraint_IsNull matcher object.
 *
 * @return PHPUnit_Framework_Constraint_IsNull
 * @since  Method available since Release 3.3.0
 */
function isNull()
{
    return PHPUnit_Framework_Assert::isNull();
}
    /**
     * @covers PHPUnit_Framework_Constraint_IsNull
     * @covers PHPUnit_Framework_Constraint_Not
     * @covers PHPUnit_Framework_Assert::isNull
     * @covers PHPUnit_Framework_Assert::logicalNot
     * @covers PHPUnit_Framework_TestFailure::exceptionToString
     */
    public function testConstraintIsNotNull2()
    {
        $constraint = PHPUnit_Framework_Assert::logicalNot(PHPUnit_Framework_Assert::isNull());
        try {
            $constraint->evaluate(null, 'custom message');
        } catch (PHPUnit_Framework_ExpectationFailedException $e) {
            $this->assertEquals(<<<EOF
custom message
Failed asserting that null is not null.

EOF
, PHPUnit_Framework_TestFailure::exceptionToString($e));
            return;
        }
        $this->fail();
    }