Add tests

tests/Modifiers/ColorspaceModifierTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Image\Tests\Modifiers;
+
+use Intervention\Image\Colors\Rgb\Colorspace;
+use Intervention\Image\Exceptions\NotSupportedException;
+use Intervention\Image\Interfaces\ColorspaceInterface;
+use Intervention\Image\Modifiers\ColorspaceModifier;
+use Intervention\Image\Tests\TestCase;
+
+class ColorspaceModifierTest extends TestCase
+{
+    public function testTargetColorspace(): void
+    {
+        $modifier = new ColorspaceModifier(new Colorspace());
+        $this->assertInstanceOf(ColorspaceInterface::class, $modifier->targetColorspace());
+
+        $modifier = new ColorspaceModifier('rgb');
+        $this->assertInstanceOf(ColorspaceInterface::class, $modifier->targetColorspace());
+
+        $modifier = new ColorspaceModifier('cmyk');
+        $this->assertInstanceOf(ColorspaceInterface::class, $modifier->targetColorspace());
+
+        $modifier = new ColorspaceModifier('test');
+        $this->expectException(NotSupportedException::class);
+        $modifier->targetColorspace();
+    }
+}

tests/Modifiers/PadModifierTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Intervention\Image\Tests\Modifiers;
+
+use Intervention\Image\Geometry\Rectangle;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\SizeInterface;
+use Intervention\Image\Modifiers\PadModifier;
+use Intervention\Image\Tests\TestCase;
+use Mockery;
+
+class PadModifierTest extends TestCase
+{
+    public function testGetCropSize(): void
+    {
+        $modifier = new PadModifier(300, 200);
+        $image = Mockery::mock(ImageInterface::class);
+        $size = new Rectangle(300, 200);
+        $image->shouldReceive('size')->andReturn($size);
+        $this->assertInstanceOf(SizeInterface::class, $modifier->getCropSize($image));
+    }
+}