more tests, subImage and GrayscaleRasterImage this time

test/unit/BlackAndWhiteRasterImageTest.php

@@ -74,6 +74,16 @@ public function testRectEmpty()
         $this -> assertEquals($expected, $img -> toString());
     }
 
+    public function testSubImageEmpty()
+    {
+        $img = BlackAndWhiteRasterImage::create(5, 5);
+        $img -> rect(1, 1, 3, 3);
+        $img = $img -> subImage(1, 1, 3, 3);
+        $expected = "█▀█\n" .
+                    "▀▀▀\n";
+        $this -> assertEquals($expected, $img -> toString());
+    }
+
     public function testRectFilled()
     {
         $img = BlackAndWhiteRasterImage::create(5, 5);

test/unit/GrayscaleRasterImageTest.php

@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * Many of these tests use an example image like this-
+ *╭────╮
+ *│░░▒▒│   ░░ = 255   ▓▓ = 80
+ *│▓▓██│   ▒▒ = 160   ██ = 0
+ *╰────╯
+ */
+use PHPUnit\Framework\TestCase;
+use Mike42\GfxPhp\GrayscaleRasterImage;
+use Mike42\GfxPhp\RgbRasterImage;
+
+class GrayscaleRasterImageTest extends TestCase {
+    protected function createGrayscaleTestImage() {
+        $image = GrayscaleRasterImage::create(2, 2);
+        $image -> setPixel(0, 0, 255);
+        $image -> setPixel(1, 0, 160);
+        $image -> setPixel(0, 1, 80);
+        $image -> setPixel(1, 1, 0);
+        return $image;
+    }
+
+    public function testCreate()
+    {
+        $img = $this -> createGrayscaleTestImage();
+        $this -> assertEquals(2, $img -> getWidth());
+        $this -> assertEquals(2, $img -> getHeight());
+        $this -> assertEquals(255, $img -> getMaxVal());
+        $this -> assertEquals("▄▄\n", $img -> toBlackAndWhite() -> toString());
+    }
+
+
+    public function testToRgb()
+    {
+        $white = RgbRasterImage::rgbToInt(255, 255, 255);
+        $lightGray = RgbRasterImage::rgbToInt(160, 160, 160);
+        $darkGray = RgbRasterImage::rgbToInt(80, 80, 80);
+        $black = RgbRasterImage::rgbToInt(0, 0, 0);
+        $img = $this -> createGrayscaleTestImage() -> toRgb();
+        $this -> assertEquals($white, $img -> getPixel(0, 0));
+        $this -> assertEquals($lightGray, $img -> getPixel(1, 0));
+        $this -> assertEquals($darkGray, $img -> getPixel(0, 1));
+        $this -> assertEquals($black, $img -> getPixel(1, 1));
+    }
+
+    public function testToIndexed()
+    {
+        // Same raster data is used, with grayscale 'palette'
+        $img = $this -> createGrayscaleTestImage() -> toIndexed();
+        $this -> assertEquals(255, $img -> getPixel(0, 0));
+        $this -> assertEquals(160, $img -> getPixel(1, 0));
+        $this -> assertEquals(80, $img -> getPixel(0, 1));
+        $this -> assertEquals(0, $img -> getPixel(1, 1));
+    }
+}