diff --git a/tests/ClassMapGeneratorTest.php b/tests/ClassMapGeneratorTest.php
index 393a69e..94af6b3 100644
--- a/tests/ClassMapGeneratorTest.php
+++ b/tests/ClassMapGeneratorTest.php
@@ -240,6 +240,18 @@ public function testCreateMapDoesNotHitRegexBacktraceLimit(): void
         self::assertEqualsNormalized($expected, $result);
     }
 
+    public function testGetPSR4Violations(): void
+    {
+        $this->generator->scanPaths(__DIR__ . '/Fixtures/psrViolations', null, 'psr-4', 'Foo\\');
+        $classMap = $this->generator->getClassMap();
+        static::assertSame(
+            [
+                'Class Foo\Bar\ClassWithIncorrectSubNamespace located in ./tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php does not comply with psr-4 autoloading standard. Skipping.',
+            ],
+            $classMap->getPSRViolations()
+        );
+    }
+
     /**
      * @param array<string, string> $expected
      * @param array<class-string, string> $actual
diff --git a/tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php b/tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php
new file mode 100644
index 0000000..687a289
--- /dev/null
+++ b/tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace Foo\Bar;
+
+class ClassWithIncorrectSubNamespace {}