diff --git a/build.gradle b/build.gradle
index 455d5cb..f2f5ebe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -43,4 +43,7 @@ ext {
     timberVersion = '4.7.1'
     injectVersion = '1'
 
+    //test
+    truthVersion = '1.0'
+
 }
\ No newline at end of file
diff --git a/sample/build.gradle b/sample/build.gradle
index a2cc650..a1dac5f 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -37,4 +37,7 @@ dependencies {
 //    implementation project(':wood-no-op')
     implementation "com.jakewharton.timber:timber:$timberVersion"
     implementation "androidx.appcompat:appcompat:$appcompatVersioon"
+
+    testImplementation 'junit:junit:4.12'
+    testImplementation "com.google.truth:truth:$truthVersion"
 }
diff --git a/sample/src/test/java/com/tonytangandroid/wood/sample/AppTest.java b/sample/src/test/java/com/tonytangandroid/wood/sample/AppTest.java
new file mode 100644
index 0000000..ea0b9f6
--- /dev/null
+++ b/sample/src/test/java/com/tonytangandroid/wood/sample/AppTest.java
@@ -0,0 +1,14 @@
+package com.tonytangandroid.wood.sample;
+
+import com.google.common.truth.Truth;
+
+import org.junit.Test;
+
+public class AppTest {
+
+    @Test
+    public void onCreate() {
+
+        Truth.assertThat(1 + 1).isEqualTo(2);
+    }
+}
\ No newline at end of file
diff --git a/wood/build.gradle b/wood/build.gradle
index 2a3f387..2f616ea 100644
--- a/wood/build.gradle
+++ b/wood/build.gradle
@@ -60,6 +60,10 @@ dependencies {
     annotationProcessor "androidx.room:room-compiler:$roomVersion"
     implementation "androidx.paging:paging-runtime:$pagingVersion"
     implementation "androidx.lifecycle:lifecycle-extensions:$lifecycleVersion"
+
+
+    testImplementation 'junit:junit:4.12'
+    testImplementation "com.google.truth:truth:$truthVersion"
 }
 
 // Place it at the end of the file
diff --git a/wood/src/test/java/com/tonytangandroid/wood/ClearTransactionsServiceTest.java b/wood/src/test/java/com/tonytangandroid/wood/ClearTransactionsServiceTest.java
new file mode 100644
index 0000000..fbae185
--- /dev/null
+++ b/wood/src/test/java/com/tonytangandroid/wood/ClearTransactionsServiceTest.java
@@ -0,0 +1,15 @@
+package com.tonytangandroid.wood;
+
+import com.google.common.truth.Truth;
+
+import org.junit.Test;
+
+public class ClearTransactionsServiceTest {
+
+    @Test
+    public void onHandleIntent() {
+
+        Truth.assertThat(1 + 1).isEqualTo(2);
+
+    }
+}
\ No newline at end of file