Make --filter case insensitive - issue sebastianbergmann#3181

src/Runner/Filter/NameFilterIterator.php

@@ -79,7 +79,7 @@ protected function setFilter($filter)
 
             // Escape delimiters in regular expression. Do NOT use preg_quote,
             // to keep magic characters.
-            $filter = \sprintf('/%s/', \str_replace(
+            $filter = \sprintf('/%s/i', \str_replace(
                 '/',
                 '\\/',
                 $filter

tests/unit/Runner/Filter/NameFilterIteratorTest.php

@@ -0,0 +1,42 @@
+<?php
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace unit\Runner\Filter;
+
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Runner\Filter\NameFilterIterator;
+
+class NameFilterIteratorTest extends TestCase
+{
+    public function testCaseSensitiveMatch()
+    {
+        $iterator = $this->getTestSuiteItteratorMock();
+        $filter   = new NameFilterIterator($iterator, 'Success');
+        $this->assertTrue((bool) $filter->accept());
+    }
+
+    public function testCaseInsensitiveMatch()
+    {
+        $iterator = $this->getTestSuiteItteratorMock();
+        $filter   = new NameFilterIterator($iterator, 'success');
+        $this->assertTrue((bool) $filter->accept());
+    }
+
+    /**
+     * @return \PHPUnit\Framework\TestSuiteIterator
+     */
+    private function getTestSuiteItteratorMock()
+    {
+        $success   = new \Success();
+        $iterator = $this->createMock(\PHPUnit\Framework\TestSuiteIterator::class);
+        $iterator->expects($this->once())->method('current')->willReturn($success);
+
+        return $iterator;
+    }
+}