diff --git a/test/ResponseTest.php b/test/ResponseTest.php
index 4df72fb148..b6d4a6d092 100644
--- a/test/ResponseTest.php
+++ b/test/ResponseTest.php
@@ -24,6 +24,13 @@ public function testResponseFactoryFromStringCreatesValidResponse()
         $this->assertEquals('Foo Bar', $response->getContent());
     }
 
+    public function testResponseFactoryFromStringWithInvalid100ResponseContent()
+    {
+        $this->expectException(RuntimeException::class);
+        $string = 'HTTP/1.0 100 Continue' . "\r\n";
+        Response::fromString($string);
+    }
+
     public function testResponseCanRenderStatusLine()
     {
         $response = new Response();