Separate multi-block comments; update README

tests/ImageBlobTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+final class ImageBlobTest extends TestCase
+{
+    private Dumbastro\FitsPhp\ImageBlob $imageBlob;
+    private Dumbastro\FitsPhp\Fits $fits;
+    private Dumbastro\FitsPhp\FitsHeader $header;
+
+    protected function setUp(): void
+    {
+        $this->fits = new Dumbastro\FitsPhp\Fits(__DIR__ . '/test_orion.fit');
+        $this->header = $this->fits->header();
+        $blob = $this->fits->imageBlob;
+
+        $this->imageBlob = new Dumbastro\FitsPhp\ImageBlob($this->header, $blob);
+    }
+
+    public function testBitpixValue(): void
+    {
+        $this->assertSame($this->imageBlob->bitpix->value, 16);
+    }
+
+    public function testDataBitsLength(): void
+    {
+        $this->assertSame($this->imageBlob->dataBits, 16*2448*1669);
+    }
+}
+ 
+