expectation.php

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<?php
    /**
     *    base include file for SimpleTest
     *    @package    SimpleTest
     *    @subpackage    UnitTester
     *    @version    $Id: expectation.php 163 2008-01-14 04:40:16Z matt $
     */

    /**#@+
     *    include other SimpleTest class files
     */
    require_once(dirname(__FILE__) . '/dumper.php');
    require_once(dirname(__FILE__) . '/compatibility.php');
    /**#@-*/

    /**
     *    Assertion that can display failure information.
     *    Also includes various helper methods.
     *    @package SimpleTest
     *    @subpackage UnitTester
     *    @abstract
     */
    class SimpleExpectation {
        var $_dumper = false;
        var $_message;

        /**
         *    Creates a dumper for displaying values and sets
         *    the test message.
         *    @param string $message    Customised message on failure.
         */
        function SimpleExpectation($message = '%s') {
            $this->_message = $message;
        }

        /**
         *    Tests the expectation. True if correct.
         *    @param mixed $compare        Comparison value.
         *    @return boolean              True if correct.
         *    @access public
         *    @abstract
         */
        function test($compare) {
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         *    @abstract
         */
        function testMessage($compare) {
        }

        /**
         *    Overlays the generated message onto the stored user
         *    message. An additional message can be interjected.
         *    @param mixed $compare        Comparison value.
         *    @param SimpleDumper $dumper  For formatting the results.
         *    @return string               Description of success
         *                                 or failure.
         *    @access public
         */
        function overlayMessage($compare, $dumper) {
            $this->_dumper = $dumper;
            return sprintf($this->_message, $this->testMessage($compare));
        }

        /**
         *    Accessor for the dumper.
         *    @return SimpleDumper    Current value dumper.
         *    @access protected
         */
        function &_getDumper() {
            if (! $this->_dumper) {
                $dumper = &new SimpleDumper();
                return $dumper;
            }
            return $this->_dumper;
        }

        /**
         *    Test to see if a value is an expectation object.
         *    A useful utility method.
         *    @param mixed $expectation    Hopefully an Epectation
         *                                 class.
         *    @return boolean              True if descended from
         *                                 this class.
         *    @access public
         *    @static
         */
        function isExpectation($expectation) {
            return is_object($expectation) &&
                    SimpleTestCompatibility::isA($expectation, 'SimpleExpectation');
        }
    }

    /**
     *    A wildcard expectation always matches.
     *    @package SimpleTest
     *    @subpackage MockObjects
     */
    class AnythingExpectation extends SimpleExpectation {

        /**
         *    Tests the expectation. Always true.
         *    @param mixed $compare  Ignored.
         *    @return boolean        True.
         *    @access public
         */
        function test($compare) {
            return true;
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            $dumper = &$this->_getDumper();
            return 'Anything always matches [' . $dumper->describeValue($compare) . ']';
        }
    }

    /**
     *    An expectation that never matches.
     *    @package SimpleTest
     *    @subpackage MockObjects
     */
    class FailedExpectation extends SimpleExpectation {

        /**
         *    Tests the expectation. Always false.
         *    @param mixed $compare  Ignored.
         *    @return boolean        True.
         *    @access public
         */
        function test($compare) {
            return false;
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of failure.
         *    @access public
         */
        function testMessage($compare) {
            $dumper = &$this->_getDumper();
            return 'Failed expectation never matches [' . $dumper->describeValue($compare) . ']';
        }
    }

    /**
     *    An expectation that passes on boolean true.
     *    @package SimpleTest
     *    @subpackage MockObjects
     */
    class TrueExpectation extends SimpleExpectation {

        /**
         *    Tests the expectation.
         *    @param mixed $compare  Should be true.
         *    @return boolean        True on match.
         *    @access public
         */
        function test($compare) {
            return (boolean)$compare;
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            $dumper = &$this->_getDumper();
            return 'Expected true, got [' . $dumper->describeValue($compare) . ']';
        }
    }

    /**
     *    An expectation that passes on boolean false.
     *    @package SimpleTest
     *    @subpackage MockObjects
     */
    class FalseExpectation extends SimpleExpectation {

        /**
         *    Tests the expectation.
         *    @param mixed $compare  Should be false.
         *    @return boolean        True on match.
         *    @access public
         */
        function test($compare) {
            return ! (boolean)$compare;
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            $dumper = &$this->_getDumper();
            return 'Expected false, got [' . $dumper->describeValue($compare) . ']';
        }
    }

    /**
     *    Test for equality.
     *    @package SimpleTest
     *    @subpackage UnitTester
     */
    class EqualExpectation extends SimpleExpectation {
        var $_value;

        /**
         *    Sets the value to compare against.
         *    @param mixed $value        Test value to match.
         *    @param string $message     Customised message on failure.
         *    @access public
         */
        function EqualExpectation($value, $message = '%s') {
            $this->SimpleExpectation($message);
            $this->_value = $value;
        }

        /**
         *    Tests the expectation. True if it matches the
         *    held value.
         *    @param mixed $compare        Comparison value.
         *    @return boolean              True if correct.
         *    @access public
         */
        function test($compare) {
            return (($this->_value == $compare) && ($compare == $this->_value));
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            if ($this->test($compare)) {
                return "Equal expectation [" . $this->_dumper->describeValue($this->_value) . "]";
            } else {
                return "Equal expectation fails " .
                        $this->_dumper->describeDifference($this->_value, $compare);
            }
        }

        /**
         *    Accessor for comparison value.
         *    @return mixed       Held value to compare with.
         *    @access protected
         */
        function _getValue() {
            return $this->_value;
        }
    }

    /**
     *    Test for inequality.
     *    @package SimpleTest
     *    @subpackage UnitTester
     */
    class NotEqualExpectation extends EqualExpectation {

        /**
         *    Sets the value to compare against.
         *    @param mixed $value       Test value to match.
         *    @param string $message    Customised message on failure.
         *    @access public
         */
        function NotEqualExpectation($value, $message = '%s') {
            $this->EqualExpectation($value, $message);
        }

        /**
         *    Tests the expectation. True if it differs from the
         *    held value.
         *    @param mixed $compare        Comparison value.
         *    @return boolean              True if correct.
         *    @access public
         */
        function test($compare) {
            return ! parent::test($compare);
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            $dumper = &$this->_getDumper();
            if ($this->test($compare)) {
                return "Not equal expectation passes " .
                        $dumper->describeDifference($this->_getValue(), $compare);
            } else {
                return "Not equal expectation fails [" .
                        $dumper->describeValue($this->_getValue()) .
                        "] matches";
            }
        }
    }

    /**
     *    Test for being within a range.
     *    @package SimpleTest
     *    @subpackage UnitTester
     */
    class WithinMarginExpectation extends SimpleExpectation {
        var $_upper;
        var $_lower;

        /**
         *    Sets the value to compare against and the fuzziness of
         *    the match. Used for comparing floating point values.
         *    @param mixed $value        Test value to match.
         *    @param mixed $margin       Fuzziness of match.
         *    @param string $message     Customised message on failure.
         *    @access public
         */
        function WithinMarginExpectation($value, $margin, $message = '%s') {
            $this->SimpleExpectation($message);
            $this->_upper = $value + $margin;
            $this->_lower = $value - $margin;
        }

        /**
         *    Tests the expectation. True if it matches the
         *    held value.
         *    @param mixed $compare        Comparison value.
         *    @return boolean              True if correct.
         *    @access public
         */
        function test($compare) {
            return (($compare <= $this->_upper) && ($compare >= $this->_lower));
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            if ($this->test($compare)) {
                return $this->_withinMessage($compare);
            } else {
                return $this->_outsideMessage($compare);
            }
        }

        /**
         *    Creates a the message for being within the range.
         *    @param mixed $compare        Value being tested.
         *    @access private
         */
        function _withinMessage($compare) {
            return "Within expectation [" . $this->_dumper->describeValue($this->_lower) . "] and [" .
                    $this->_dumper->describeValue($this->_upper) . "]";
        }

        /**
         *    Creates a the message for being within the range.
         *    @param mixed $compare        Value being tested.
         *    @access private
         */
        function _outsideMessage($compare) {
            if ($compare > $this->_upper) {
                return "Outside expectation " .
                        $this->_dumper->describeDifference($compare, $this->_upper);
            } else {
                return "Outside expectation " .
                        $this->_dumper->describeDifference($compare, $this->_lower);
            }
        }
    }

    /**
     *    Test for being outside of a range.
     *    @package SimpleTest
     *    @subpackage UnitTester
     */
    class OutsideMarginExpectation extends WithinMarginExpectation {

        /**
         *    Sets the value to compare against and the fuzziness of
         *    the match. Used for comparing floating point values.
         *    @param mixed $value        Test value to not match.
         *    @param mixed $margin       Fuzziness of match.
         *    @param string $message     Customised message on failure.
         *    @access public
         */
        function OutsideMarginExpectation($value, $margin, $message = '%s') {
            $this->WithinMarginExpectation($value, $margin, $message);
        }

        /**
         *    Tests the expectation. True if it matches the
         *    held value.
         *    @param mixed $compare        Comparison value.
         *    @return boolean              True if correct.
         *    @access public
         */
        function test($compare) {
            return ! parent::test($compare);
        }

        /**
         *    Returns a human readable test message.
         *    @param mixed $compare      Comparison value.
         *    @return string             Description of success
         *                               or failure.
         *    @access public
         */
        function testMessage($compare) {
            if (! $this->test($compare)) {
                return $this->_withinMessage($compare);
            } else {
                return $this->_outsideMessage($compare);
            }
        }
    }

    /**
     *    Test for reference.
     *    @package SimpleTest
     *    @subpackage UnitTester
     */