Graph/tests/logarithmical_axis_test.php - zetacomponents - Git at Google

 <?php
 /**
  * ezcGraphLogarithmicalAxisTest
  *
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  *
  * @package Graph
  * @version //autogen//
  * @subpackage Tests
  * @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved.
  * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
  */

 require_once dirname( __FILE__ ) . '/test_case.php';

 /**
  * Tests for ezcGraph class.
  *
  * @package Graph
  * @subpackage Tests
  */
 class ezcGraphLogarithmicalAxisTest extends ezcGraphTestCase
 {
     protected $basePath;

     protected $tempDir;

 	public static function suite()
 	{
 		return new PHPUnit_Framework_TestSuite( "ezcGraphLogarithmicalAxisTest" );
 	}

     protected function setUp()
     {
         static $i = 0;
         $this->tempDir = $this->createTempDir( __CLASS__ . sprintf( '_%03d_', ++$i ) ) . '/';
         $this->basePath = dirname( __FILE__ ) . '/data/';
     }

     protected function tearDown()
     {
         if ( !$this->hasFailed() )
         {
             $this->removeTempDir();
         }
     }

     public function testChartElementLogarithmicalAxisPropertyMin()
     {
         $options = new ezcGraphChartElementLogarithmicalAxis();

         $this->assertSame(
             null,
             $options->min,
             'Wrong default value for property min in class ezcGraphChartElementLogarithmicalAxis'
         );

         $options->min = 1;
         $this->assertSame(
             1.,
             $options->min,
             'Setting property value did not work for property min in class ezcGraphChartElementLogarithmicalAxis'
         );

         try
         {
             $options->min = false;
         }
         catch ( ezcBaseValueException $e )
         {
             return true;
         }

         $this->fail( 'Expected ezcBaseValueException.' );
     }

     public function testChartElementLogarithmicalAxisPropertyMax()
     {
         $options = new ezcGraphChartElementLogarithmicalAxis();

         $this->assertSame(
             null,
             $options->max,
             'Wrong default value for property max in class ezcGraphChartElementLogarithmicalAxis'
         );

         $options->max = 1;
         $this->assertSame(
             1.,
             $options->max,
             'Setting property value did not work for property max in class ezcGraphChartElementLogarithmicalAxis'
         );

         try
         {
             $options->max = false;
         }
         catch ( ezcBaseValueException $e )
         {
             return true;
         }

         $this->fail( 'Expected ezcBaseValueException.' );
     }

     public function testChartElementLogarithmicalAxisPropertyBase()
     {
         $options = new ezcGraphChartElementLogarithmicalAxis();

         $this->assertSame(
             10,
             $options->base,
             'Wrong default value for property base in class ezcGraphChartElementLogarithmicalAxis'
         );

         $options->base = M_E;
         $this->assertSame(
             M_E,
             $options->base,
             'Setting property value did not work for property base in class ezcGraphChartElementLogarithmicalAxis'
         );

         try
         {
             $options->base = false;
         }
         catch ( ezcBaseValueException $e )
         {
             return true;
         }

         $this->fail( 'Expected ezcBaseValueException.' );
     }

     public function testChartElementLogarithmicalAxisPropertyFormatString()
     {
         $options = new ezcGraphChartElementLogarithmicalAxis();

         $this->assertSame(
             '%1$d^%2$d',
             $options->logarithmicalFormatString,
             'Wrong default value for property logarithmicalFormatString in class ezcGraphChartElementLogarithmicalAxis'
         );

         $options->logarithmicalFormatString = '%2$.2f^%1$d';
         $this->assertSame(
             '%2$.2f^%1$d',
             $options->logarithmicalFormatString,
             'Setting property value did not work for property logarithmicalFormatString in class ezcGraphChartElementLogarithmicalAxis'
         );
     }

     public function testManualScaling()
     {
         $chart = new ezcGraphLineChart();
         $chart->yAxis->min = -5;
         $chart->yAxis->max = 5;
         $chart->yAxis->majorStep = 2;
         $chart->yAxis->minorStep = 1;

         $this->assertEquals(
             -5.,
             $chart->yAxis->min
         );

         $this->assertEquals(
             5.,
             $chart->yAxis->max
         );

         $this->assertEquals(
             2.,
             $chart->yAxis->majorStep
         );

         $this->assertEquals(
             1.,
             $chart->yAxis->minorStep
         );
     }

     public function testAutomagicScalingMultiple()
     {
         $chart = new ezcGraphLineChart();
         $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
         $chart->data['sample'] = new ezcGraphArrayDataSet( array( .003, 12, 43, 1023, .02, 1.5 ) );
         $chart->render( 500, 300 );

         $this->assertEquals(
             -3,
             $chart->yAxis->min,
             'As value for: min; '
         );

         $this->assertEquals(
             4,
             $chart->yAxis->max,
             'As value for: max; '
         );

         $this->assertEquals(
             1,
             $chart->yAxis->majorStep,
             'As value for: majorStep; '
         );

         $this->assertEquals(
             1,
             $chart->yAxis->minorStep,
             'As value for: minorStep; '
         );
     }

     public function testAutomagicScalingException()
     {
         $chart = new ezcGraphLineChart();
         $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();

         try
         {
             $chart->data['sample'] = new ezcGraphArrayDataSet( array( .003, 12, 43, 1023, .02, -1.5 ) );
             $chart->render( 500, 300 );
         }
         catch ( ezcGraphOutOfLogithmicalBoundingsException $e )
         {
             return true;
         }

         $this->fail( 'Expect ezcGraphOutOfLogithmicalBoundingsException.' );
     }

     public function testAutomagicScalingValues()
     {
         $chart = new ezcGraphLineChart();
         $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();

         $chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );
         $chart->render( 500, 300 );

         $this->assertEquals(
             -2,
             $chart->yAxis->min,
             'As value for: min; '
         );

         $this->assertEquals(
             4,
             $chart->yAxis->max,
             'As value for: max; '
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( .01 ),
             1,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( .1 ),
             .833,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 1 ),
             .667,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 10 ),
             .5,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 100 ),
             .333,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 1000 ),
             .167,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 10000 ),
             0,
             'Wrong value calculated on logarithmical axis.',
             .001
         );
     }

     public function testAutomagicScalingValuesBase2()
     {
         $chart = new ezcGraphLineChart();
         $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
         $chart->yAxis->base = 2;

         $chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 3823 ) );
         $chart->render( 500, 300 );

         $this->assertEquals(
             -6,
             $chart->yAxis->min,
             'As value for: min; '
         );

         $this->assertEquals(
             12,
             $chart->yAxis->max,
             'As value for: max; '
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( .015625 ),
             1,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( .125 ),
             .833,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 1 ),
             .667,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 8 ),
             .5,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 64 ),
             .333,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 512 ),
             .167,
             'Wrong value calculated on logarithmical axis.',
             .001
         );

         $this->assertEquals(
             $chart->yAxis->getCoordinate( 4096 ),
             0,
             'Wrong value calculated on logarithmical axis.',
             .001
         );
     }

     public function testRenderCompleteImage()
     {
         $filename = $this->tempDir . __FUNCTION__ . '.svg';

         $chart = new ezcGraphLineChart();
         $chart->palette = new ezcGraphPaletteEz();
         $chart->title = 'Function x^2 with logarithmical axis scaling';
         $chart->legend = false;

         $chart->xAxis = new ezcGraphChartElementNumericAxis();

         $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
         $chart->yAxis->logarithmicalFormatString = '^%2$d';
         $chart->yAxis->label = 'Base 10';

         $values = array();
         for ( $x = -50; $x <= 50; $x += 1 )
         {
             $values[$x] = $x * $x + .01;
         }

         $chart->data['x^2'] = new ezcGraphArrayDataSet( $values );
         $chart->data['x^2']->symbol = ezcGraph::NO_SYMBOL;

         $chart->render( 400, 200, $filename );

         $this->compare(
             $filename,
             $this->basePath . 'compare/' . __CLASS__ . '_' . __FUNCTION__ . '.svg'
         );
     }

     public function testRenderedLabels()
     {
         try
         {
             $chart = new ezcGraphLineChart();
             $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
             $chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );
             $chart->render( 500, 200 );
         }
         catch ( ezcGraphFontRenderingException $e )
         {
             // Ignore
         }

         $steps = $chart->yAxis->getSteps();

         $expectedLabels = array(
             '10^-2', '10^-1', '10^0', '10^1', '10^2', '10^3', '10^4',
         );

         foreach ( $steps as $nr => $step )
         {
             $this->assertSame(
                 $step->label,
                 $expectedLabels[$nr],
                 'Label not as expected'
             );
         }
     }

     public function testRenderedLabelsWithLabelFormattingCallback()
     {
         try
         {
             $chart = new ezcGraphLineChart();

             $chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
             $chart->yAxis->labelCallback = create_function(
                 '$label',
                 'return "*$label*";'
             );

             $chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );

             $chart->render( 500, 200 );
         }
         catch ( ezcGraphFontRenderingException $e )
         {
             // Ignore
         }

         $steps = $chart->yAxis->getSteps();

         $expectedLabels = array(
             '*10^-2*', '*10^-1*', '*10^0*', '*10^1*', '*10^2*', '*10^3*', '*10^4*',
         );

         foreach ( $steps as $nr => $step )
         {
             $this->assertSame(
                 $step->label,
                 $expectedLabels[$nr],
                 'Label not as expected'
             );
         }
     }
 }
 ?>
	<?php
	/**
	* ezcGraphLogarithmicalAxisTest
	*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*
	* @package Graph
	* @version //autogen//
	* @subpackage Tests
	* @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved.
	* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
	*/

	require_once dirname( __FILE__ ) . '/test_case.php';

	/**
	* Tests for ezcGraph class.
	*
	* @package Graph
	* @subpackage Tests
	*/
	class ezcGraphLogarithmicalAxisTest extends ezcGraphTestCase
	{
	protected $basePath;

	protected $tempDir;

	public static function suite()
	{
	return new PHPUnit_Framework_TestSuite( "ezcGraphLogarithmicalAxisTest" );
	}

	protected function setUp()
	{
	static $i = 0;
	$this->tempDir = $this->createTempDir( __CLASS__ . sprintf( '_%03d_', ++$i ) ) . '/';
	$this->basePath = dirname( __FILE__ ) . '/data/';
	}

	protected function tearDown()
	{
	if ( !$this->hasFailed() )
	{
	$this->removeTempDir();
	}
	}

	public function testChartElementLogarithmicalAxisPropertyMin()
	{
	$options = new ezcGraphChartElementLogarithmicalAxis();

	$this->assertSame(
	null,
	$options->min,
	'Wrong default value for property min in class ezcGraphChartElementLogarithmicalAxis'
	);

	$options->min = 1;
	$this->assertSame(
	1.,
	$options->min,
	'Setting property value did not work for property min in class ezcGraphChartElementLogarithmicalAxis'
	);

	try
	{
	$options->min = false;
	}
	catch ( ezcBaseValueException $e )
	{
	return true;
	}

	$this->fail( 'Expected ezcBaseValueException.' );
	}

	public function testChartElementLogarithmicalAxisPropertyMax()
	{
	$options = new ezcGraphChartElementLogarithmicalAxis();

	$this->assertSame(
	null,
	$options->max,
	'Wrong default value for property max in class ezcGraphChartElementLogarithmicalAxis'
	);

	$options->max = 1;
	$this->assertSame(
	1.,
	$options->max,
	'Setting property value did not work for property max in class ezcGraphChartElementLogarithmicalAxis'
	);

	try
	{
	$options->max = false;
	}
	catch ( ezcBaseValueException $e )
	{
	return true;
	}

	$this->fail( 'Expected ezcBaseValueException.' );
	}

	public function testChartElementLogarithmicalAxisPropertyBase()
	{
	$options = new ezcGraphChartElementLogarithmicalAxis();

	$this->assertSame(
	10,
	$options->base,
	'Wrong default value for property base in class ezcGraphChartElementLogarithmicalAxis'
	);

	$options->base = M_E;
	$this->assertSame(
	M_E,
	$options->base,
	'Setting property value did not work for property base in class ezcGraphChartElementLogarithmicalAxis'
	);

	try
	{
	$options->base = false;
	}
	catch ( ezcBaseValueException $e )
	{
	return true;
	}

	$this->fail( 'Expected ezcBaseValueException.' );
	}

	public function testChartElementLogarithmicalAxisPropertyFormatString()
	{
	$options = new ezcGraphChartElementLogarithmicalAxis();

	$this->assertSame(
	'%1$d^%2$d',
	$options->logarithmicalFormatString,
	'Wrong default value for property logarithmicalFormatString in class ezcGraphChartElementLogarithmicalAxis'
	);

	$options->logarithmicalFormatString = '%2$.2f^%1$d';
	$this->assertSame(
	'%2$.2f^%1$d',
	$options->logarithmicalFormatString,
	'Setting property value did not work for property logarithmicalFormatString in class ezcGraphChartElementLogarithmicalAxis'
	);
	}

	public function testManualScaling()
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis->min = -5;
	$chart->yAxis->max = 5;
	$chart->yAxis->majorStep = 2;
	$chart->yAxis->minorStep = 1;

	$this->assertEquals(
	-5.,
	$chart->yAxis->min
	);

	$this->assertEquals(
	5.,
	$chart->yAxis->max
	);

	$this->assertEquals(
	2.,
	$chart->yAxis->majorStep
	);

	$this->assertEquals(
	1.,
	$chart->yAxis->minorStep
	);
	}

	public function testAutomagicScalingMultiple()
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .003, 12, 43, 1023, .02, 1.5 ) );
	$chart->render( 500, 300 );

	$this->assertEquals(
	-3,
	$chart->yAxis->min,
	'As value for: min; '
	);

	$this->assertEquals(
	4,
	$chart->yAxis->max,
	'As value for: max; '
	);

	$this->assertEquals(
	1,
	$chart->yAxis->majorStep,
	'As value for: majorStep; '
	);

	$this->assertEquals(
	1,
	$chart->yAxis->minorStep,
	'As value for: minorStep; '
	);
	}

	public function testAutomagicScalingException()
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();

	try
	{
	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .003, 12, 43, 1023, .02, -1.5 ) );
	$chart->render( 500, 300 );
	}
	catch ( ezcGraphOutOfLogithmicalBoundingsException $e )
	{
	return true;
	}

	$this->fail( 'Expect ezcGraphOutOfLogithmicalBoundingsException.' );
	}

	public function testAutomagicScalingValues()
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();

	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );
	$chart->render( 500, 300 );

	$this->assertEquals(
	-2,
	$chart->yAxis->min,
	'As value for: min; '
	);

	$this->assertEquals(
	4,
	$chart->yAxis->max,
	'As value for: max; '
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( .01 ),
	1,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( .1 ),
	.833,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 1 ),
	.667,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 10 ),
	.5,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 100 ),
	.333,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 1000 ),
	.167,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 10000 ),
	0,
	'Wrong value calculated on logarithmical axis.',
	.001
	);
	}

	public function testAutomagicScalingValuesBase2()
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
	$chart->yAxis->base = 2;

	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 3823 ) );
	$chart->render( 500, 300 );

	$this->assertEquals(
	-6,
	$chart->yAxis->min,
	'As value for: min; '
	);

	$this->assertEquals(
	12,
	$chart->yAxis->max,
	'As value for: max; '
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( .015625 ),
	1,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( .125 ),
	.833,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 1 ),
	.667,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 8 ),
	.5,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 64 ),
	.333,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 512 ),
	.167,
	'Wrong value calculated on logarithmical axis.',
	.001
	);

	$this->assertEquals(
	$chart->yAxis->getCoordinate( 4096 ),
	0,
	'Wrong value calculated on logarithmical axis.',
	.001
	);
	}

	public function testRenderCompleteImage()
	{
	$filename = $this->tempDir . __FUNCTION__ . '.svg';

	$chart = new ezcGraphLineChart();
	$chart->palette = new ezcGraphPaletteEz();
	$chart->title = 'Function x^2 with logarithmical axis scaling';
	$chart->legend = false;

	$chart->xAxis = new ezcGraphChartElementNumericAxis();

	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
	$chart->yAxis->logarithmicalFormatString = '^%2$d';
	$chart->yAxis->label = 'Base 10';

	$values = array();
	for ( $x = -50; $x <= 50; $x += 1 )
	{
	$values[$x] = $x * $x + .01;
	}

	$chart->data['x^2'] = new ezcGraphArrayDataSet( $values );
	$chart->data['x^2']->symbol = ezcGraph::NO_SYMBOL;

	$chart->render( 400, 200, $filename );

	$this->compare(
	$filename,
	$this->basePath . 'compare/' . __CLASS__ . '_' . __FUNCTION__ . '.svg'
	);
	}

	public function testRenderedLabels()
	{
	try
	{
	$chart = new ezcGraphLineChart();
	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );
	$chart->render( 500, 200 );
	}
	catch ( ezcGraphFontRenderingException $e )
	{
	// Ignore
	}

	$steps = $chart->yAxis->getSteps();

	$expectedLabels = array(
	'10^-2', '10^-1', '10^0', '10^1', '10^2', '10^3', '10^4',
	);

	foreach ( $steps as $nr => $step )
	{
	$this->assertSame(
	$step->label,
	$expectedLabels[$nr],
	'Label not as expected'
	);
	}
	}

	public function testRenderedLabelsWithLabelFormattingCallback()
	{
	try
	{
	$chart = new ezcGraphLineChart();

	$chart->yAxis = new ezcGraphChartElementLogarithmicalAxis();
	$chart->yAxis->labelCallback = create_function(
	'$label',
	'return "$label";'
	);

	$chart->data['sample'] = new ezcGraphArrayDataSet( array( .03, 12, 43, 1023, .02, 1.5, 9823 ) );

	$chart->render( 500, 200 );
	}
	catch ( ezcGraphFontRenderingException $e )
	{
	// Ignore
	}

	$steps = $chart->yAxis->getSteps();

	$expectedLabels = array(
	'10^-2', '10^-1', '10^0', '10^1', '10^2', '10^3', '10^4',
	);

	foreach ( $steps as $nr => $step )
	{
	$this->assertSame(
	$step->label,
	$expectedLabels[$nr],
	'Label not as expected'
	);
	}
	}
	}
	?>