diff --git a/modules/monitoring/application/clicommands/ListCommand.php b/modules/monitoring/application/clicommands/ListCommand.php
index 2548c138e..320e144d7 100644
--- a/modules/monitoring/application/clicommands/ListCommand.php
+++ b/modules/monitoring/application/clicommands/ListCommand.php
@@ -263,13 +263,13 @@ class ListCommand extends Command
             try {
                 $pset = PerfdataSet::fromString($row->service_perfdata);
                 $perfs = array();
-                foreach ($pset as $perfName => $p) {
+                foreach ($pset as $p) {
                     if ($percent = $p->getPercentage()) {
                         if ($percent < 0 || $percent > 100) {
                             continue;
                         }
                         $perfs[] = ' '
-                                 . $perfName
+                                 . $p->getLabel()
                                  . ': '
                                  . $this->getPercentageSign($percent)
                                  . '  '
diff --git a/modules/monitoring/application/views/helpers/Perfdata.php b/modules/monitoring/application/views/helpers/Perfdata.php
index a9ede94fd..68b9b1e9e 100644
--- a/modules/monitoring/application/views/helpers/Perfdata.php
+++ b/modules/monitoring/application/views/helpers/Perfdata.php
@@ -14,11 +14,11 @@ class Zend_View_Helper_Perfdata extends Zend_View_Helper_Abstract
         $result = '';
         $table = array();
         $pset = array_slice(PerfdataSet::fromString($perfdataStr)->asArray(), 0, ($compact ? 5 : null));
-        foreach ($pset as $label => $perfdata) {
+        foreach ($pset as $perfdata) {
             if (!$perfdata->isPercentage() && $perfdata->getMaximumValue() === null) {
                 continue;
             }
-            $pieChart = $this->createInlinePie($perfdata, $label, htmlspecialchars($label));
+            $pieChart = $this->createInlinePie($perfdata);
             if ($compact) {
                 if (! $float) {
                     $result .= $pieChart->render();
@@ -31,7 +31,7 @@ class Zend_View_Helper_Perfdata extends Zend_View_Helper_Abstract
                 }
                 $pieChart->setStyle('margin: 0.2em 0.5em 0.2em 0.5em;');
                 $table[] = '<tr><th>' . $pieChart->render()
-                    . htmlspecialchars($label)
+                    . htmlspecialchars($perfdata->getLabel())
                     . '</th><td> '
                     . htmlspecialchars($this->formatPerfdataValue($perfdata)) .
                     ' </td></tr>';
@@ -81,10 +81,10 @@ class Zend_View_Helper_Perfdata extends Zend_View_Helper_Abstract
         return $perfdata->getValue();
     }
 
-    protected function createInlinePie(Perfdata $perfdata, $title, $label = '')
+    protected function createInlinePie(Perfdata $perfdata)
     {
-        $pieChart = new InlinePie($this->calculatePieChartData($perfdata), $title);
-        $pieChart->setLabel($label);
+        $pieChart = new InlinePie($this->calculatePieChartData($perfdata), $perfdata->getLabel());
+        $pieChart->setLabel(htmlspecialchars($perfdata->getLabel()));
         $pieChart->setHideEmptyLabel();
 
         //$pieChart->setHeight(32)->setWidth(32);
diff --git a/modules/monitoring/library/Monitoring/Plugin/Perfdata.php b/modules/monitoring/library/Monitoring/Plugin/Perfdata.php
index a23c60392..44d3765b8 100644
--- a/modules/monitoring/library/Monitoring/Plugin/Perfdata.php
+++ b/modules/monitoring/library/Monitoring/Plugin/Perfdata.php
@@ -4,7 +4,7 @@
 
 namespace Icinga\Module\Monitoring\Plugin;
 
-use Icinga\Exception\ProgrammingError;
+use InvalidArgumentException;
 
 class Perfdata
 {
@@ -22,6 +22,13 @@ class Perfdata
      */
     protected $unit;
 
+    /**
+     * The label
+     *
+     * @var string
+     */
+    protected $label;
+
     /**
      * The value
      *
@@ -58,13 +65,15 @@ class Perfdata
     protected $criticalThreshold;
 
     /**
-     * Create a new Perfdata object based on the given performance data value
+     * Create a new Perfdata object based on the given performance data label and value
      *
-     * @param   string      $perfdataValue      The value to parse
+     * @param   string      $label      The perfdata label
+     * @param   string      $value      The perfdata value
      */
-    protected function __construct($perfdataValue)
+    public function __construct($label, $value)
     {
-        $this->perfdataValue = $perfdataValue;
+        $this->perfdataValue = $value;
+        $this->label = $label;
         $this->parse();
 
         if ($this->unit === '%') {
@@ -78,25 +87,30 @@ class Perfdata
     }
 
     /**
-     * Return a new Perfdata object based on the given performance data value
+     * Return a new Perfdata object based on the given performance data key=value pair
      *
-     * @param   string      $perfdataValue      The value to parse
+     * @param   string      $perfdata       The key=value pair to parse
      *
      * @return  Perfdata
      *
-     * @throws  ProgrammingError                In case the given performance data value has no content
+     * @throws  InvalidArgumentException    In case the given performance data has no content or a invalid format
      */
-    public static function fromString($perfdataValue)
+    public static function fromString($perfdata)
     {
-        if (empty($perfdataValue)) {
-            throw new ProgrammingError('Perfdata::fromString expects a string with content');
+        if (empty($perfdata)) {
+            throw new InvalidArgumentException('Perfdata::fromString expects a string with content');
+        } elseif (false === strpos($perfdata, '=')) {
+            throw new InvalidArgumentException(
+                'Perfdata::fromString expects a key=value formatted string. Got "' . $perfdata . '" instead'
+            );
         }
 
-        return new static($perfdataValue);
+        list($label, $value) = explode('=', $perfdata, 2);
+        return new static(trim($label), trim($value));
     }
 
     /**
-     * Return whether this performance data value is a number
+     * Return whether this performance data's value is a number
      *
      * @return  bool    True in case it's a number, otherwise False
      */
@@ -106,7 +120,7 @@ class Perfdata
     }
 
     /**
-     * Return whether this performance data value are seconds
+     * Return whether this performance data's value are seconds
      *
      * @return  bool    True in case it's seconds, otherwise False
      */
@@ -116,7 +130,7 @@ class Perfdata
     }
 
     /**
-     * Return whether this performance data value is in percentage
+     * Return whether this performance data's value is in percentage
      *
      * @return  bool    True in case it's in percentage, otherwise False
      */
@@ -126,7 +140,7 @@ class Perfdata
     }
 
     /**
-     * Return whether this performance data value is in bytes
+     * Return whether this performance data's value is in bytes
      *
      * @return  bool    True in case it's in bytes, otherwise False
      */
@@ -136,7 +150,7 @@ class Perfdata
     }
 
     /**
-     * Return whether this performance data value is a counter
+     * Return whether this performance data's value is a counter
      *
      * @return  bool    True in case it's a counter, otherwise False
      */
@@ -145,6 +159,14 @@ class Perfdata
         return $this->unit === 'c';
     }
 
+    /**
+     * Return this perfomance data's label
+     */
+    public function getLabel()
+    {
+        return $this->label;
+    }
+
     /**
      * Return the value or null if it is unknown (U)
      *
@@ -176,7 +198,7 @@ class Perfdata
     }
 
     /**
-     * Return this value's warning treshold or null if it is not available
+     * Return this performance data's warning treshold or null if it is not available
      *
      * @return  null|string
      */
@@ -186,7 +208,7 @@ class Perfdata
     }
 
     /**
-     * Return this value's critical treshold or null if it is not available
+     * Return this performance data's critical treshold or null if it is not available
      *
      * @return  null|string
      */
diff --git a/modules/monitoring/library/Monitoring/Plugin/PerfdataSet.php b/modules/monitoring/library/Monitoring/Plugin/PerfdataSet.php
index 8038354a4..c62904bb3 100644
--- a/modules/monitoring/library/Monitoring/Plugin/PerfdataSet.php
+++ b/modules/monitoring/library/Monitoring/Plugin/PerfdataSet.php
@@ -85,7 +85,7 @@ class PerfdataSet implements IteratorAggregate
             $value = trim($this->readUntil(' '));
 
             if ($label && $value) {
-                $this->perfdata[$label] = Perfdata::fromString($value);
+                $this->perfdata[] = new Perfdata($label, $value);
             }
         }
     }
diff --git a/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataSetTest.php b/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataSetTest.php
index 86c0f71a7..3edd20857 100644
--- a/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataSetTest.php
+++ b/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataSetTest.php
@@ -17,19 +17,19 @@ class PerfdataSetTest extends BaseTestCase
     public function testWhetherValidSimplePerfdataLabelsAreProperlyParsed()
     {
         $pset = PerfdataSetWithPublicData::fromString('key1=val1   key2=val2 key3  =val3');
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key1',
-            $pset->perfdata,
+            $pset->perfdata[0]->getLabel(),
             'PerfdataSet does not correctly parse valid simple labels'
         );
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key2',
-            $pset->perfdata,
+            $pset->perfdata[1]->getLabel(),
             'PerfdataSet does not correctly parse valid simple labels'
         );
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key3',
-            $pset->perfdata,
+            $pset->perfdata[2]->getLabel(),
             'PerfdataSet does not correctly parse valid simple labels'
         );
     }
@@ -37,14 +37,14 @@ class PerfdataSetTest extends BaseTestCase
     public function testWhetherNonQuotedPerfdataLablesWithSpacesAreProperlyParsed()
     {
         $pset = PerfdataSetWithPublicData::fromString('key 1=val1 key 1 + 1=val2');
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 1',
-            $pset->perfdata,
+            $pset->perfdata[0]->getLabel(),
             'PerfdataSet does not correctly parse non quoted labels with spaces'
         );
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 1 + 1',
-            $pset->perfdata,
+            $pset->perfdata[1]->getLabel(),
             'PerfdataSet does not correctly parse non quoted labels with spaces'
         );
     }
@@ -52,14 +52,14 @@ class PerfdataSetTest extends BaseTestCase
     public function testWhetherValidQuotedPerfdataLabelsAreProperlyParsed()
     {
         $pset = PerfdataSetWithPublicData::fromString('\'key 1\'=val1 "key 2"=val2');
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 1',
-            $pset->perfdata,
+            $pset->perfdata[0]->getLabel(),
             'PerfdataSet does not correctly parse valid quoted labels'
         );
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 2',
-            $pset->perfdata,
+            $pset->perfdata[1]->getLabel(),
             'PerfdataSet does not correctly parse valid quoted labels'
         );
     }
@@ -67,14 +67,14 @@ class PerfdataSetTest extends BaseTestCase
     public function testWhetherInvalidQuotedPerfdataLabelsAreProperlyParsed()
     {
         $pset = PerfdataSetWithPublicData::fromString('\'key 1=val1 key 2"=val2');
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 1',
-            $pset->perfdata,
+            $pset->perfdata[0]->getLabel(),
             'PerfdataSet does not correctly parse invalid quoted labels'
         );
-        $this->assertArrayHasKey(
+        $this->assertEquals(
             'key 2"',
-            $pset->perfdata,
+            $pset->perfdata[1]->getLabel(),
             'PerfdataSet does not correctly parse invalid quoted labels'
         );
     }
@@ -85,8 +85,8 @@ class PerfdataSetTest extends BaseTestCase
     public function testWhetherAPerfdataSetIsIterable()
     {
         $pset = PerfdataSet::fromString('key=value');
-        foreach ($pset as $label => $value) {
-            $this->assertEquals('key', $label);
+        foreach ($pset as $p) {
+            $this->assertEquals('key', $p->getLabel());
             return;
         }
 
diff --git a/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataTest.php b/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataTest.php
index be1de875e..2d8a98b73 100644
--- a/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataTest.php
+++ b/modules/monitoring/test/php/library/Monitoring/Plugin/PerfdataTest.php
@@ -10,142 +10,189 @@ use Icinga\Module\Monitoring\Plugin\Perfdata;
 class PerfdataTest extends BaseTestCase
 {
     /**
-     * @expectedException   Icinga\Exception\ProgrammingError
+     * @expectedException   \InvalidArgumentException
      */
     public function testWhetherFromStringThrowsExceptionWhenGivenAnEmptyString()
     {
         Perfdata::fromString('');
     }
 
+    /**
+     * @expectedException   \InvalidArgumentException
+     */
+    public function testWhetherFromStringThrowsExceptionWhenGivenAnInvalidString()
+    {
+        Perfdata::fromString('test');
+    }
+
+    public function testWhetherFromStringParsesAGivenStringCorrectly()
+    {
+        $p = Perfdata::fromString('key=1234');
+        $this->assertEquals(
+            'key',
+            $p->getLabel(),
+            'Perfdata::fromString does not properly parse performance data labels'
+        );
+        $this->assertEquals(
+            1234,
+            $p->getValue(),
+            'Perfdata::fromString does not properly parse performance data values'
+        );
+    }
+
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetValueReturnsValidValues()
     {
         $this->assertEquals(
             1337.0,
-            Perfdata::fromString('1337')->getValue(),
+            Perfdata::fromString('test=1337')->getValue(),
             'Perfdata::getValue does not return correct values'
         );
         $this->assertEquals(
             1337.0,
-            Perfdata::fromString('1337;;;;')->getValue(),
+            Perfdata::fromString('test=1337;;;;')->getValue(),
             'Perfdata::getValue does not return correct values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherDecimalValuesAreCorrectlyParsed()
     {
         $this->assertEquals(
             1337.5,
-            Perfdata::fromString('1337.5')->getValue(),
+            Perfdata::fromString('test=1337.5')->getValue(),
             'Perfdata objects do not parse decimal values correctly'
         );
         $this->assertEquals(
             1337.5,
-            Perfdata::fromString('1337.5B')->getValue(),
+            Perfdata::fromString('test=1337.5B')->getValue(),
             'Perfdata objects do not parse decimal values correctly'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetValueReturnsNullForInvalidOrUnknownValues()
     {
         $this->assertNull(
-            Perfdata::fromString('U')->getValue(),
+            Perfdata::fromString('test=U')->getValue(),
             'Perfdata::getValue does not return null for unknown values'
         );
         $this->assertNull(
-            Perfdata::fromString('i am not a value')->getValue(),
+            Perfdata::fromString('test=i am not a value')->getValue(),
             'Perfdata::getValue does not return null for invalid values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetWarningTresholdReturnsCorrectValues()
     {
         $this->assertEquals(
             '10',
-            Perfdata::fromString('1;10')->getWarningThreshold(),
+            Perfdata::fromString('test=1;10')->getWarningThreshold(),
             'Perfdata::getWarningTreshold does not return correct values'
         );
         $this->assertEquals(
             '10:',
-            Perfdata::fromString('1;10:')->getWarningThreshold(),
+            Perfdata::fromString('test=1;10:')->getWarningThreshold(),
             'Perfdata::getWarningTreshold does not return correct values'
         );
         $this->assertEquals(
             '~:10',
-            Perfdata::fromString('1;~:10')->getWarningThreshold(),
+            Perfdata::fromString('test=1;~:10')->getWarningThreshold(),
             'Perfdata::getWarningTreshold does not return correct values'
         );
         $this->assertEquals(
             '10:20',
-            Perfdata::fromString('1;10:20')->getWarningThreshold(),
+            Perfdata::fromString('test=1;10:20')->getWarningThreshold(),
             'Perfdata::getWarningTreshold does not return correct values'
         );
         $this->assertEquals(
             '@10:20',
-            Perfdata::fromString('1;@10:20')->getWarningThreshold(),
+            Perfdata::fromString('test=1;@10:20')->getWarningThreshold(),
             'Perfdata::getWarningTreshold does not return correct values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetCriticalTresholdReturnsCorrectValues()
     {
         $this->assertEquals(
             '10',
-            Perfdata::fromString('1;;10')->getCriticalThreshold(),
+            Perfdata::fromString('test=1;;10')->getCriticalThreshold(),
             'Perfdata::getCriticalTreshold does not return correct values'
         );
         $this->assertEquals(
             '10:',
-            Perfdata::fromString('1;;10:')->getCriticalThreshold(),
+            Perfdata::fromString('test=1;;10:')->getCriticalThreshold(),
             'Perfdata::getCriticalTreshold does not return correct values'
         );
         $this->assertEquals(
             '~:10',
-            Perfdata::fromString('1;;~:10')->getCriticalThreshold(),
+            Perfdata::fromString('test=1;;~:10')->getCriticalThreshold(),
             'Perfdata::getCriticalTreshold does not return correct values'
         );
         $this->assertEquals(
             '10:20',
-            Perfdata::fromString('1;;10:20')->getCriticalThreshold(),
+            Perfdata::fromString('test=1;;10:20')->getCriticalThreshold(),
             'Perfdata::getCriticalTreshold does not return correct values'
         );
         $this->assertEquals(
             '@10:20',
-            Perfdata::fromString('1;;@10:20')->getCriticalThreshold(),
+            Perfdata::fromString('test=1;;@10:20')->getCriticalThreshold(),
             'Perfdata::getCriticalTreshold does not return correct values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetMinimumValueReturnsCorrectValues()
     {
         $this->assertEquals(
             1337.0,
-            Perfdata::fromString('1;;;1337')->getMinimumValue(),
+            Perfdata::fromString('test=1;;;1337')->getMinimumValue(),
             'Perfdata::getMinimumValue does not return correct values'
         );
         $this->assertEquals(
             1337.5,
-            Perfdata::fromString('1;;;1337.5')->getMinimumValue(),
+            Perfdata::fromString('test=1;;;1337.5')->getMinimumValue(),
             'Perfdata::getMinimumValue does not return correct values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherGetMaximumValueReturnsCorrectValues()
     {
         $this->assertEquals(
             1337.0,
-            Perfdata::fromString('1;;;;1337')->getMaximumValue(),
+            Perfdata::fromString('test=1;;;;1337')->getMaximumValue(),
             'Perfdata::getMaximumValue does not return correct values'
         );
         $this->assertEquals(
             1337.5,
-            Perfdata::fromString('1;;;;1337.5')->getMaximumValue(),
+            Perfdata::fromString('test=1;;;;1337.5')->getMaximumValue(),
             'Perfdata::getMaximumValue does not return correct values'
         );
     }
 
+    /**
+     * @depends testWhetherFromStringParsesAGivenStringCorrectly
+     */
     public function testWhetherMissingValuesAreReturnedAsNull()
     {
-        $perfdata = Perfdata::fromString('1;;3;5');
+        $perfdata = Perfdata::fromString('test=1;;3;5');
         $this->assertNull(
             $perfdata->getWarningThreshold(),
             'Perfdata objects do not return null for missing warning tresholds'
@@ -162,7 +209,7 @@ class PerfdataTest extends BaseTestCase
     public function testWhetherValuesAreIdentifiedAsNumber()
     {
         $this->assertTrue(
-            Perfdata::fromString('666')->isNumber(),
+            Perfdata::fromString('test=666')->isNumber(),
             'Perfdata objects do not identify ordinary digits as number'
         );
     }
@@ -173,15 +220,15 @@ class PerfdataTest extends BaseTestCase
     public function testWhetherValuesAreIdentifiedAsSeconds()
     {
         $this->assertTrue(
-            Perfdata::fromString('666s')->isSeconds(),
+            Perfdata::fromString('test=666s')->isSeconds(),
             'Perfdata objects do not identify seconds as seconds'
         );
         $this->assertTrue(
-            Perfdata::fromString('666us')->isSeconds(),
+            Perfdata::fromString('test=666us')->isSeconds(),
             'Perfdata objects do not identify microseconds as seconds'
         );
         $this->assertTrue(
-            Perfdata::fromString('666ms')->isSeconds(),
+            Perfdata::fromString('test=666ms')->isSeconds(),
             'Perfdata objects do not identify milliseconds as seconds'
         );
     }
@@ -192,7 +239,7 @@ class PerfdataTest extends BaseTestCase
     public function testWhetherValuesAreIdentifiedAsPercentage()
     {
         $this->assertTrue(
-            Perfdata::fromString('66%')->isPercentage(),
+            Perfdata::fromString('test=66%')->isPercentage(),
             'Perfdata objects do not identify percentages as percentages'
         );
     }
@@ -202,7 +249,7 @@ class PerfdataTest extends BaseTestCase
      */
     public function testWhetherMinAndMaxAreNotRequiredIfUnitIsInPercent()
     {
-        $perfdata = Perfdata::fromString('1%');
+        $perfdata = Perfdata::fromString('test=1%');
         $this->assertEquals(
             0.0,
             $perfdata->getMinimumValue(),
@@ -221,23 +268,23 @@ class PerfdataTest extends BaseTestCase
     public function testWhetherValuesAreIdentifiedAsBytes()
     {
         $this->assertTrue(
-            Perfdata::fromString('66666B')->isBytes(),
+            Perfdata::fromString('test=66666B')->isBytes(),
             'Perfdata objects do not identify bytes as bytes'
         );
         $this->assertTrue(
-            Perfdata::fromString('6666KB')->isBytes(),
+            Perfdata::fromString('test=6666KB')->isBytes(),
             'Perfdata objects do not identify kilobytes as bytes'
         );
         $this->assertTrue(
-            Perfdata::fromString('666MB')->isBytes(),
+            Perfdata::fromString('test=666MB')->isBytes(),
             'Perfdata objects do not identify megabytes as bytes'
         );
         $this->assertTrue(
-            Perfdata::fromString('66GB')->isBytes(),
+            Perfdata::fromString('test=66GB')->isBytes(),
             'Perfdata objects do not identify gigabytes as bytes'
         );
         $this->assertTrue(
-            Perfdata::fromString('6TB')->isBytes(),
+            Perfdata::fromString('test=6TB')->isBytes(),
             'Perfdata objects do not identify terabytes as bytes'
         );
     }
@@ -248,7 +295,7 @@ class PerfdataTest extends BaseTestCase
     public function testWhetherValuesAreIdentifiedAsCounter()
     {
         $this->assertTrue(
-            Perfdata::fromString('123c')->isCounter(),
+            Perfdata::fromString('test=123c')->isCounter(),
             'Perfdata objects do not identify counters as counters'
         );
     }
@@ -260,7 +307,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             666 / pow(10, 6),
-            Perfdata::fromString('666us')->getValue(),
+            Perfdata::fromString('test=666us')->getValue(),
             'Perfdata objects do not correctly convert microseconds to seconds'
         );
     }
@@ -272,7 +319,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             666 / pow(10, 3),
-            Perfdata::fromString('666ms')->getValue(),
+            Perfdata::fromString('test=666ms')->getValue(),
             'Perfdata objects do not correctly convert microseconds to seconds'
         );
     }
@@ -284,20 +331,20 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             66.0,
-            Perfdata::fromString('66%')->getPercentage(),
+            Perfdata::fromString('test=66%')->getPercentage(),
             'Perfdata objects do not correctly handle native percentages'
         );
         $this->assertEquals(
             50.0,
-            Perfdata::fromString('0;;;-250;250')->getPercentage(),
+            Perfdata::fromString('test=0;;;-250;250')->getPercentage(),
             'Perfdata objects do not correctly convert suitable values to percentages'
         );
         $this->assertNull(
-            Perfdata::fromString('50')->getPercentage(),
+            Perfdata::fromString('test=50')->getPercentage(),
             'Perfdata objects do return a percentage though their unit is not % and no maximum is given'
         );
         $this->assertNull(
-            Perfdata::fromString('25;;;50;100')->getPercentage(),
+            Perfdata::fromString('test=25;;;50;100')->getPercentage(),
             'Perfdata objects do return a percentage though their value is lower than it\'s allowed minimum'
         );
     }
@@ -309,7 +356,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             6666.0 * pow(2, 10),
-            Perfdata::fromString('6666KB')->getValue(),
+            Perfdata::fromString('test=6666KB')->getValue(),
             'Perfdata objects do not corretly convert kilobytes to bytes'
         );
     }
@@ -321,7 +368,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             666.0 * pow(2, 20),
-            Perfdata::fromString('666MB')->getValue(),
+            Perfdata::fromString('test=666MB')->getValue(),
             'Perfdata objects do not corretly convert megabytes to bytes'
         );
     }
@@ -333,7 +380,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             66.0 * pow(2, 30),
-            Perfdata::fromString('66GB')->getValue(),
+            Perfdata::fromString('test=66GB')->getValue(),
             'Perfdata objects do not corretly convert gigabytes to bytes'
         );
     }
@@ -345,7 +392,7 @@ class PerfdataTest extends BaseTestCase
     {
         $this->assertEquals(
             6.0 * pow(2, 40),
-            Perfdata::fromString('6TB')->getValue(),
+            Perfdata::fromString('test=6TB')->getValue(),
             'Perfdata objects do not corretly convert terabytes to bytes'
         );
     }