diff --git a/tests/Helper/ShellTest.php b/tests/Helper/ShellTest.php
index 9302486..62653ff 100644
--- a/tests/Helper/ShellTest.php
+++ b/tests/Helper/ShellTest.php
@@ -24,7 +24,7 @@ public function test_get_output()
 
         $shell->execute();
 
-        $this->assertSame("hello\n", $shell->getOutput());
+        $this->assertSame("hello", trim($shell->getOutput())); // trim to remove trailing newline which is OS dependent
         $this->assertSame(0, $shell->getExitCode());
     }
 
@@ -35,7 +35,7 @@ public function test_get_process_id()
         $shell->execute(true);
 
         $this->assertIsInt($pid = $shell->getProcessId());
-        $this->assertGreaterThan(getmypid(), $pid);
+        // $this->assertGreaterThan(getmypid(), $pid); // this is not always true especially on windows
     }
 
     public function test_async_stop()