diff --git a/app/release/output-metadata.json b/app/release/output-metadata.json
index edd8529..012efc1 100644
--- a/app/release/output-metadata.json
+++ b/app/release/output-metadata.json
@@ -12,7 +12,7 @@
       "filters": [],
       "attributes": [],
       "versionCode": 4,
-      "versionName": "1.9.0-release",
+      "versionName": "1.9.1-release",
       "outputFile": "app-release.apk"
     }
   ],
diff --git a/app/src/androidTest/java/com/huozige/lab/container/ExampleInstrumentedTest.java b/app/src/androidTest/java/com/huozige/lab/container/ExampleInstrumentedTest.java
deleted file mode 100644
index 1ded2c9..0000000
--- a/app/src/androidTest/java/com/huozige/lab/container/ExampleInstrumentedTest.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.huozige.lab.container;
-
-import android.content.Context;
-
-import androidx.test.platform.app.InstrumentationRegistry;
-import androidx.test.ext.junit.runners.AndroidJUnit4;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import static org.junit.Assert.*;
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-@RunWith(AndroidJUnit4.class)
-public class ExampleInstrumentedTest {
-    @Test
-    public void useAppContext() {
-        // Context of the app under test.
-        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
-        assertEquals("com.huozige.lab.container", appContext.getPackageName());
-    }
-}
\ No newline at end of file
diff --git a/app/src/test/java/com/huozige/lab/container/ExampleUnitTest.java b/app/src/test/java/com/huozige/lab/container/ExampleUnitTest.java
deleted file mode 100644
index 5041f8c..0000000
--- a/app/src/test/java/com/huozige/lab/container/ExampleUnitTest.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.huozige.lab.container;
-
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() {
-        assertEquals(4, 2 + 2);
-    }
-}
\ No newline at end of file