Change NamespaceDirectoryTest::testWithRealpathRoot(), with inspiration from ClassFilesIATest.

Author: donquixote

tests/src/NamespaceDirectoryTest.php

@@ -77,17 +77,26 @@ public function testFromReflectionClass(): void {
   }
 
   public function testWithRealpathRoot(): void {
-    $this->assertNamespaceDir(
-      __DIR__,
-      __NAMESPACE__,
-      $this
-        ->nsdir(__DIR__ . '/../src', __NAMESPACE__)
-        ->withRealpathRoot(),
-    );
+    $c = fn (string $dir) => NamespaceDirectory::create($dir, 'Acme\Zoo');
+    $realpath = realpath(__DIR__) ?: $this->fail();
+    $crooked_path = __DIR__ . '/../src';
+    $this->assertFalse(str_ends_with($realpath, '/../src'));
+    $obj_with_realpath = $c($realpath);
+    $this->assertEquals($obj_with_realpath, $c($crooked_path)->withRealpathRoot());
+
+    // A new clone is returned even though values are the same.
+    // Perhaps this will change in the future.
+    $this->assertEquals($obj_with_realpath, $obj_with_realpath->withRealpathRoot());
+    $this->assertNotSame($obj_with_realpath, $obj_with_realpath->withRealpathRoot());
+
+    // Test effect on the iterator.
+    $this->assertSame($realpath, dirname($obj_with_realpath->getIterator()->key()));
+    $this->assertSame($crooked_path, dirname($c($crooked_path)->getIterator()->key()));
+
     $this->callAndAssertException(
       \RuntimeException::class,
       fn () => $this
-        ->nsdir(__DIR__ . '/non/existing/path', 'Acme\Foo')
+        ->nsdir(__DIR__ . '/non/existing/path', 'Acme\Zoo')
         ->withRealpathRoot(),
     );
   }