added testing dependencies

example/build.gradle

@@ -24,5 +24,15 @@ dependencies {
     implementation 'com.android.support:appcompat-v7:23.1.1'
     implementation 'com.android.support:design:23.1.1'
 
+    implementation 'com.android.support:support-annotations:28.0.0'
+
+    implementation 'com.android.support:support-annotations:28.0.0'
+
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'junit:junit:4.12'
+
+    testImplementation 'junit:junit:4.12'
+
     implementation project(':usbserial')
 }

examplestreams/build.gradle

@@ -24,5 +24,13 @@ dependencies {
     implementation 'com.android.support:appcompat-v7:23.1.1'
     implementation 'com.android.support:design:23.1.1'
 
+    implementation 'com.android.support:support-annotations:28.0.0'
+
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'junit:junit:4.12'
+
+    testImplementation 'junit:junit:4.12'
+
     implementation project(':usbserial')
 }

examplestreams/src/androidTest/java/com/felhr/examplestreams/ExampleInstrumentedTest.java

@@ -7,6 +7,7 @@ import android.support.test.runner.AndroidJUnit4;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import static junit.framework.Assert.assertEquals;
 import static org.junit.Assert.*;
 
 /**

examplestreams/src/test/java/com/felhr/examplestreams/ExampleUnitTest.java

@@ -2,7 +2,7 @@ package com.felhr.examplestreams;
 
 import org.junit.Test;
 
-import static org.junit.Assert.*;
+import static junit.framework.Assert.assertEquals;
 
 /**
  * Example local unit test, which will execute on the development machine (host).

examplesync/build.gradle

@@ -24,5 +24,13 @@ dependencies {
     implementation 'com.android.support:appcompat-v7:23.1.1'
     implementation 'com.android.support:design:23.1.1'
 
+    implementation 'com.android.support:support-annotations:28.0.0'
+
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'junit:junit:4.12'
+
+    testImplementation 'junit:junit:4.12'
+
     implementation project(':usbserial')
 }

usbserial/src/main/java/com/felhr/usbserial/UsbSerialDevice.java

@@ -1,7 +1,5 @@
 package com.felhr.usbserial;
 
-import java.io.InputStream;
-import java.io.OutputStream;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import com.felhr.deviceids.CH34xIds;