fix(tests): making test code sharable to other modules

Author: milos1290

AndroidSDKTests/build.gradle

@@ -38,4 +38,15 @@ dependencies {
     testCompile 'org.powermock:powermock-api-mockito:1.6.6'
     testCompile 'org.powermock:powermock-classloading-xstream:1.6.6'
     testCompile 'org.bouncycastle:bcmail-jdk15on:1.54'
+}
+
+task jarTests(type: Jar, dependsOn: "assembleDebugUnitTest") {
+    classifier = 'tests'
+    from "$buildDir/intermediates/classes/test/debug"
+}
+configurations {
+    unitTestArtifact
+}
+artifacts {
+    unitTestArtifact jarTests
 }