Detect other PSR violations where namespace is missing or not a subnamespace of configured one

src/ClassMapGenerator.php

@@ -218,10 +218,6 @@ private function filterByNamespace(array $classes, string $filePath, string $bas
         $realSubPath = substr($realSubPath, 0, $dotPosition === false ? PHP_INT_MAX : $dotPosition);
 
         foreach ($classes as $class) {
-            // silently skip if ns doesn't have common root
-            if ('' !== $baseNamespace && 0 !== strpos($class, $baseNamespace)) {
-                continue;
-            }
             // transform class name to file path and validate
             if ('psr-0' === $namespaceType) {
                 $namespaceLength = strrpos($class, '\\');

tests/ClassMapGeneratorTest.php

@@ -240,6 +240,20 @@ public function testCreateMapDoesNotHitRegexBacktraceLimit(): void
         self::assertEqualsNormalized($expected, $result);
     }
 
+    public function testGetPSR4Violations(): void
+    {
+        $this->generator->scanPaths(__DIR__ . '/Fixtures/psrViolations', null, 'psr-4', 'ExpectedNamespace\\');
+        $classMap = $this->generator->getClassMap();
+        self::assertSame(
+            [
+                'Class ClassWithoutNameSpace located in ./tests/Fixtures/psrViolations/ClassWithoutNameSpace.php does not comply with psr-4 autoloading standard. Skipping.',
+                'Class UnexpectedNamespace\ClassWithNameSpaceOutsideConfiguredScope located in ./tests/Fixtures/psrViolations/ClassWithNameSpaceOutsideConfiguredScope.php does not comply with psr-4 autoloading standard. Skipping.',
+                'Class ExpectedNamespace\UnexpectedSubNamespace\ClassWithIncorrectSubNamespace located in ./tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php does not comply with psr-4 autoloading standard. Skipping.',
+            ],
+            $classMap->getPsrViolations()
+        );
+    }
+
     public function testCreateMapWithDirectoryExcluded(): void
     {
         $expected = array(

tests/Fixtures/psrViolations/ClassWithCorrectNameSpace.php

@@ -0,0 +1,5 @@
+<?php
+
+namespace ExpectedNamespace;
+
+class ClassWithCorrectNameSpace {}

tests/Fixtures/psrViolations/ClassWithIncorrectSubNamespace.php

@@ -0,0 +1,5 @@
+<?php
+
+namespace ExpectedNamespace\UnexpectedSubNamespace;
+
+class ClassWithIncorrectSubNamespace {}

tests/Fixtures/psrViolations/ClassWithNameSpaceOutsideConfiguredScope.php

@@ -0,0 +1,5 @@
+<?php
+
+namespace UnexpectedNamespace;
+
+class ClassWithNameSpaceOutsideConfiguredScope {}

tests/Fixtures/psrViolations/ClassWithoutNameSpace.php

@@ -0,0 +1,3 @@
+<?php
+
+class ClassWithoutNameSpace {}