diff --git a/tests/ChangedFilesDetector/ChangedFilesDetector/ChangedFilesDetectorTest.php b/tests/ChangedFilesDetector/ChangedFilesDetector/ChangedFilesDetectorTest.php
index f0f71bd932..a2a043ebfa 100644
--- a/tests/ChangedFilesDetector/ChangedFilesDetector/ChangedFilesDetectorTest.php
+++ b/tests/ChangedFilesDetector/ChangedFilesDetector/ChangedFilesDetectorTest.php
@@ -38,6 +38,16 @@ public function testHasFileChanged(): void
         $this->assertFileHasNotChanged($this->filePath);
     }
 
+    public function testClearCache(): void
+    {
+        $this->changedFilesDetector->addFilePath($this->filePath);
+        $this->assertFileHasNotChanged($this->filePath);
+
+        $this->changedFilesDetector->clearCache();
+
+        $this->assertFileHasChanged($this->filePath);
+    }
+
     public function testInvalidateCacheOnConfigurationChange(): void
     {
         $this->changedFilesDetector->addFilePath($this->filePath);