diff --git a/metropolis/installer/test/main.go b/metropolis/installer/test/main.go
index c4faf81..9f38b4d 100644
--- a/metropolis/installer/test/main.go
+++ b/metropolis/installer/test/main.go
@@ -113,6 +113,8 @@
 			return false, ctx.Err()
 		case line := <-lineC:
 			if strings.Contains(line, expectedOutput) {
+				qemuCmd.Process.Kill()
+				qemuCmd.Wait()
 				return true, nil
 			}
 		}
@@ -312,6 +314,7 @@
 	if err := checkEspContents(storage); err != nil {
 		t.Error(err.Error())
 	}
+	storage.File.Close()
 	// Run QEMU again. Expect TestOS to launch successfully.
 	expectedOutput = "_TESTOS_LAUNCH_SUCCESS_"
 	result, err = runQemu(ctx, qemuDriveParam(storagePath), expectedOutput)