Add NsDirUtilTest to cover NsDirUtil at 100% coverage.

Author: donquixote

tests/src/NsDirUtilTest.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Ock\ClassFilesIterator\Tests;
+
+use Ock\ClassFilesIterator\NsDirUtil;
+use PHPUnit\Framework\TestCase;
+
+class NsDirUtilTest extends TestCase {
+
+  use ExceptionTestTrait;
+
+  public function testTerminateNamespace(): void {
+    $f = NsDirUtil::terminateNamespace(...);
+    $this->assertSame('Acme\Zoo\Animal\\', $f('Acme\Zoo\Animal'));
+    $this->assertSame('Acme\\', $f('Acme'));
+    $this->assertSame('', $f(''));
+    $this->callAndAssertException(\InvalidArgumentException::class, fn () => $f('Acme\\Zoo\\Animal\\'));
+    $this->callAndAssertException(\InvalidArgumentException::class, fn () => $f('\\Acme\\Zoo\\Animal'));
+  }
+
+}