Feat: add base volume unit class + integration test

src/UnitConverter/Unit/Volume/VolumeUnit.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * This file is part of the jordanbrauer/unit-converter PHP package.
+ *
+ * @copyright 2017 Jordan Brauer <[email protected]>
+ * @license MIT
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types = 1);
+
+namespace UnitConverter\Unit\Volume;
+
+use UnitConverter\Measure;
+use UnitConverter\Unit\{ AbstractUnit, UnitInterface };
+
+/**
+ * Volume base data class. Any new volume units should
+ * extend this class and implement their name, symbol and units;
+ * overriding the $unitOf and $base properties only if necessary.
+ *
+ * @version 1.0.0
+ * @since 1.0.0
+ * @author Jordan Brauer <[email protected]>
+ */
+abstract class VolumeUnit extends AbstractUnit
+{
+  protected $unitOf = Measure::VOLUME;
+
+  protected $base = Litre::class;
+}

tests/integration/UnitConverter/Unit/Volume/TemperatureUnits.spec.php

@@ -0,0 +1,66 @@
+<?php
+
+/**
+ * This file is part of the jordanbrauer/unit-converter PHP package.
+ *
+ * @copyright 2017 Jordan Brauer <[email protected]>
+ * @license MIT
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types = 1);
+
+namespace UnitConverter\Tests\Integration\Unit\Volume;
+
+use PHPUnit\Framework\TestCase;
+use UnitConverter\UnitConverter;
+use UnitConverter\Registry\UnitRegistry;
+use UnitConverter\Unit\Volume\{
+  Litre,
+  Mililitre,
+  Gallon,
+  Pint
+};
+
+/**
+ * Test the default temperature units for conversion accuracy.
+ *
+ * @author Jordan Brauer <[email protected]>
+ */
+class VolumeUnitsSpec extends TestCase
+{
+  protected function setUp ()
+  {
+    $this->converter = new UnitConverter(
+      new UnitRegistry(array(
+        new Litre,
+        new Mililitre,
+        new Gallon,
+        new Pint,
+      ))
+    );
+  }
+
+  protected function tearDown ()
+  {
+    unset($this->converter);
+  }
+
+  /**
+   * @test
+   * @coversNothing
+   */
+  public function assert ()
+  {
+    $expected = 4.73176;
+    $actual = $this->converter
+      ->convert(10)
+      ->from("pt")
+      ->to("l")
+      ;
+
+    $this->assertEquals(round($expected, 5), round($actual, 5));
+  }
+}