Added quotient

app/AttributeTypes/Units/Implementations/QuotientUnits.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\AttributeTypes\Units\Implementations;
+
+use App\AttributeTypes\Units\Unit;
+use App\AttributeTypes\Units\UnitSystem;
+
+class QuotientUnits extends UnitSystem
+{
+
+    public function __construct()
+    {
+        parent::__construct('quotient', [
+            Unit::createUnit('percent', '%', 1e4),
+            Unit::createBase('parts per million'     , 'ppm'),
+        ]);
+    }
+
+
+
+} 

app/AttributeTypes/Units/Implementations/VolumetricFlowUnits.php

@@ -11,7 +11,7 @@
 class VolumetricFlowUnits extends UnitSystem {
     public function __construct() {
         parent::__construct('volumetric flow', [
-            Unit::createBase( 'm³/s', 'm³/s'),
+            Unit::createBase('m³/s', 'm³/s'),
             Unit::createUnit('l/s'      , 'l/s', 10 ** (Si::DECI * 3)),
         ]);
 

tests/Unit/Attributes/SiAttributeTest.php

@@ -8,6 +8,7 @@
 use App\AttributeTypes\Units\Implementations\LengthUnits;
 use App\AttributeTypes\Units\Implementations\MassUnits;
 use App\AttributeTypes\Units\Implementations\PressureUnits;
+use App\AttributeTypes\Units\Implementations\QuotientUnits;
 use App\AttributeTypes\Units\Implementations\SpeedUnits;
 use App\AttributeTypes\Units\Implementations\TemperatureUnits;
 use App\AttributeTypes\Units\Implementations\TimeUnits;
@@ -391,6 +392,19 @@ public function testVolumetricFlow(){
         $this->assertEquals(10 ** -3, $lps->is(1));
     }
 
+    public function testQuotients(){
+        $quotientUnits = new QuotientUnits();
+
+        $baseUnit = $quotientUnits->getBaseUnit();
+        $this->assertEquals('ppm', $baseUnit->getSymbol());
+        $this->assertEquals('parts per million', $baseUnit->getLabel());
+
+        $percent = $quotientUnits->get('percent');
+        $this->assertEquals('%', $percent->getSymbol());
+        $this->assertEquals(1, $percent->is(1e-4));
+        $this->assertEquals(1e6, $percent->is(100));
+    }
+
 
     public function testImportErrorWrongValue(){
         $importValue = 10;