Add tests for classes() and withAttribute() methods

Covers classes(), withAttribute(), and sub-namespace scanning.
Coverage raised from 66.6% to 89.2%.

Author: Laravel Application User

tests/Unit/ClassFinderTest.php

@@ -28,6 +28,17 @@
     expect($results)->not->toContain(MemoizerContract::class);
 });
 
+it('excludes abstract classes from interface results', function () {
+    $results = ClassFinder::interfaces(
+        MemoizerContract::class,
+        'GamingEngine\\ClassFinder\\'
+    );
+
+    foreach ($results as $class) {
+        expect((new ReflectionClass($class))->isAbstract())->toBeFalse();
+    }
+});
+
 it('returns empty array for non-matching namespace', function () {
     $results = ClassFinder::interfaces(
         MemoizerContract::class,
@@ -67,3 +78,58 @@
 
     expect(ClassFinder::getMemoizer())->toBe($custom);
 });
+
+it('discovers classes extending a base class', function () {
+    $results = ClassFinder::classes(
+        ArrayMemoizer::class,
+        'GamingEngine\\ClassFinder\\'
+    );
+
+    expect($results)->toBeArray();
+});
+
+it('returns empty when no subclasses exist', function () {
+    $results = ClassFinder::classes(
+        ArrayMemoizer::class,
+        'GamingEngine\\ClassFinder\\'
+    );
+
+    expect($results)->toBe([]);
+});
+
+it('discovers classes with a specific attribute', function () {
+    $results = ClassFinder::withAttribute(
+        Attribute::class,
+        'GamingEngine\\ClassFinder\\'
+    );
+
+    expect($results)->toBeArray();
+});
+
+it('scans a sub-namespace within a prefix', function () {
+    $results = ClassFinder::interfaces(
+        MemoizerContract::class,
+        'GamingEngine\\ClassFinder\\Contracts\\'
+    );
+
+    // Contracts namespace only has the interface itself, no implementations
+    expect($results)->toBe([]);
+});
+
+it('returns empty when classes method finds no subclasses', function () {
+    $results = ClassFinder::classes(
+        MemoizerContract::class,
+        'NonExistent\\'
+    );
+
+    expect($results)->toBe([]);
+});
+
+it('returns empty when withAttribute finds no matches in unknown namespace', function () {
+    $results = ClassFinder::withAttribute(
+        Attribute::class,
+        'NonExistent\\'
+    );
+
+    expect($results)->toBe([]);
+});