Add the authored eq2_unknown.png placeholder

tests/game/eq2_icon_coverage_test.php

@@ -0,0 +1,88 @@
+<?php
+/**
+ * @package bbGuild EQ2 Extension
+ * @copyright (c) 2026 avathar.be
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ */
+
+namespace avathar\bbguildeq2\tests\game;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Guards icon coverage against the classes the installer actually seeds.
+ *
+ * The roster resolves class_images/<imagename>.png for character rows and
+ * roster_classes/<imagename>.png for the grid, so a seeded class with no
+ * file behind it has no icon. avathar/bbguild#389 makes that degrade
+ * instead of rendering broken, but the asset is still missing.
+ */
+class eq2_icon_coverage_test extends TestCase
+{
+	/** Gaps that are known and tracked; see #7 */
+	private const KNOWN_GAPS = array(
+		// none — fully covered
+	);
+
+	/** Same, for the grid's artwork directory */
+	private const KNOWN_ROSTER_GAPS = array(
+		'eq2_beastlord',
+		'eq2_channeler',
+		'eq2_unknown',
+	);
+
+	/**
+	 * @return list<string> Every imagename the installer seeds
+	 */
+	private function seeded_imagenames(): array
+	{
+		$files = glob(dirname(__DIR__, 2) . '/game/*_installer.php');
+		$src   = file_get_contents($files[0]);
+
+		preg_match_all("/'imagename'\s*=>\s*'([^']+)'/", $src, $m);
+
+		$names = array_values(array_unique(array_filter(array_map('trim', $m[1]))));
+		sort($names);
+
+		return $names;
+	}
+
+	private function assertNoUnexpectedGaps(string $dir, array $known): void
+	{
+		$base    = dirname(__DIR__, 2) . '/images/' . $dir . '/';
+		$missing = array();
+
+		foreach ($this->seeded_imagenames() as $name)
+		{
+			if (!file_exists($base . $name . '.png'))
+			{
+				$missing[] = $name;
+			}
+		}
+
+		$unexpected = array_values(array_diff($missing, $known));
+
+		$this->assertSame(
+			array(),
+			$unexpected,
+			$dir . ' is missing icons that are not tracked as known gaps: ' . implode(', ', $unexpected)
+		);
+	}
+
+	public function test_class_images_cover_every_seeded_class(): void
+	{
+		$this->assertNoUnexpectedGaps('class_images', self::KNOWN_GAPS);
+	}
+
+	public function test_roster_classes_cover_every_seeded_class(): void
+	{
+		$this->assertNoUnexpectedGaps('roster_classes', self::KNOWN_ROSTER_GAPS);
+	}
+
+	public function test_the_installer_seeds_the_expected_class_count(): void
+	{
+		// Guards the parser: if the installer's array syntax changes, the
+		// coverage assertions must not silently pass on an empty list.
+		$this->assertCount(27, $this->seeded_imagenames());
+	}
+}