diff --git a/server/src/test/java/org/cloudfoundry/identity/uaa/ratelimiting/util/SourcedFileTest.java b/server/src/test/java/org/cloudfoundry/identity/uaa/ratelimiting/util/SourcedFileTest.java
index 0859b12422e..51b5a2162b5 100644
--- a/server/src/test/java/org/cloudfoundry/identity/uaa/ratelimiting/util/SourcedFileTest.java
+++ b/server/src/test/java/org/cloudfoundry/identity/uaa/ratelimiting/util/SourcedFileTest.java
@@ -7,6 +7,7 @@
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mock;
 
 class SourcedFileTest {
     public static final String EFFECTIVELY_EMPTY_FILE_CONTENTS = "\n  \n";
@@ -42,7 +43,13 @@ void loadEnv() {
         assertNotNull( SourcedFile.locateAndLoadLocalFile("uaa-ratelimit.yml", SourcedFileTest.class.getClassLoader().getResource("uaa-ratelimit.yml").getPath().replace("uaa-ratelimit.yml", "")));
         assertNull( SourcedFile.locateAndLoadLocalFile("", SourcedFileTest.class.getClassLoader().getResource("uaa-ratelimit.yml").getPath().replace("uaa-ratelimit.yml", "")));
         assertNull( SourcedFile.locateAndLoadLocalFile("random", "/dev"));
-        assertNull( SourcedFile.locateAndLoadLocalFile("0", "/proc/1/fdinfo"));
+        assertNull( SourcedFile.locateAndLoadLocalFile("?", "/proc/1/fdinfo"));
+    }
+
+    @Test
+    void loadStreamException() {
+        InputStream in = mock(InputStream.class);
+        assertThrows(IllegalStateException.class, () -> SourcedFile.loadFile( in, "" ) );
     }
 
     private void check( String fileContents, String source ) {