[java] set driver to null when session ended

Author: titusfortner

java/main/src/main/java/com/saucelabs/saucebindings/SauceSession.java

@@ -102,6 +102,7 @@ private void updateResult(String result) {
     private void stop() {
         if(driver !=null) {
             driver.quit();
+            driver = null;
         }
     }
 }

java/main/src/test/java/com/saucelabs/saucebindings/integration/DesktopBrowserTest.java

@@ -10,6 +10,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 public class DesktopBrowserTest {
@@ -69,4 +70,12 @@ public void storesResultOfFirstStop() {
 
         assertEquals("passed", session.getResult());
     }
+
+    @Test
+    public void nullsDriver() {
+        webDriver = session.start();
+        session.stop(true);
+
+        assertNull(session.getDriver());
+    }
 }