diff --git a/.travis.yml b/.travis.yml
index 15ffbfd..0173bc1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,20 @@
-language: java
+language: android
 install: true
 
 jdk:
   - oraclejdk8
 
+android:
+  components:
+  - tools
+  - platform-tools
+  - build-tools-27.0.3
+  - android-27
+  - extra-android-m2repository
+
+before_install:
+  - yes | sdkmanager "platforms;android-27"
+
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
@@ -14,4 +25,4 @@ cache:
     - $HOME/.gradle/wrapper/
 
 script:
-  - ./gradlew clean build
+  - ./gradlew clean build --stacktrace
diff --git a/autoplay/build.gradle.kts b/autoplay/build.gradle.kts
index 35b007a..6d36a78 100644
--- a/autoplay/build.gradle.kts
+++ b/autoplay/build.gradle.kts
@@ -46,8 +46,8 @@ publishing {
             name = "central"
             url = uri("https://oss.sonatype.org/service/local/staging/deploy/maven2")
             credentials {
-                username = project.property("NEXUS_USERNAME") as String? ?: ""
-                password = project.property("NEXUS_PASSWORD") as String? ?: ""
+                username = project.getPropertyOrEmptyString("NEXUS_USERNAME")
+                password = project.getPropertyOrEmptyString("NEXUS_PASSWORD")
             }
         }
     }
@@ -103,3 +103,24 @@ publishing {
 signing {
     sign(publishing.publications["Autoplay"])
 }
+
+fun Project.getPropertyOrEmptyString(name: String): String {
+    return if (hasProperty(name)) {
+        property(name) as String? ?: ""
+    } else {
+        ""
+    }
+}
+
+tasks.withType<Test> {
+    addTestListener(object : TestListener {
+        override fun beforeSuite(suite: TestDescriptor) {}
+        override fun beforeTest(testDescriptor: TestDescriptor) {}
+        override fun afterSuite(suite: TestDescriptor, result: TestResult) {}
+        override fun afterTest(testDescriptor: TestDescriptor, result: TestResult) {
+            if (result.resultType == TestResult.ResultType.FAILURE) {
+                result.exception?.printStackTrace()
+            }
+        }
+    })
+}
\ No newline at end of file
diff --git a/autoplay/src/test/kotlin/de/halfbit/tools/autoplay/PlayPublisherPluginTest.kt b/autoplay/src/test/kotlin/de/halfbit/tools/autoplay/PlayPublisherPluginTest.kt
index 748b17d..13fb09d 100644
--- a/autoplay/src/test/kotlin/de/halfbit/tools/autoplay/PlayPublisherPluginTest.kt
+++ b/autoplay/src/test/kotlin/de/halfbit/tools/autoplay/PlayPublisherPluginTest.kt
@@ -1,32 +1,46 @@
 package de.halfbit.tools.autoplay
 
 import com.google.common.truth.Truth.assertThat
-import de.halfbit.tools.autoplay.PlayPublisherPlugin
-import de.halfbit.tools.autoplay.PublishApkTask
 import de.halfbit.tools.autoplay.publisher.ReleaseStatus
 import de.halfbit.tools.autoplay.publisher.ReleaseTrack
+import org.gradle.api.Project
+import org.gradle.api.ProjectConfigurationException
 import org.gradle.kotlin.dsl.withGroovyBuilder
 import org.gradle.testfixtures.ProjectBuilder
+import org.hamcrest.core.IsEqual.equalTo
+import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
+import org.junit.internal.matchers.ThrowableMessageMatcher.hasMessage
+import org.junit.rules.ExpectedException
 import java.io.File
 
-class PlayPublisherPluginTest {
+internal class PlayPublisherPluginTest {
 
-    @Test
-    fun `Test PublishApkTask with proper configuration`() {
+    @Rule
+    @JvmField
+    var thrown: ExpectedException = ExpectedException.none()
+
+    private lateinit var project: Project
 
-        val project = ProjectBuilder.builder()
+    @Before
+    fun before() {
+        project = ProjectBuilder.builder()
             .withName("sample-application")
             .withProjectDir(File("src/test/resources/sample-application/app"))
             .build()
 
         project.pluginManager.apply("com.android.application")
         project.pluginManager.apply(PlayPublisherPlugin::class.java)
+    }
+
+    @Test
+    fun `PlayPublisherPlugin, valid configuration`() {
 
         project.withGroovyBuilder {
 
             "android" {
-                "compileSdkVersion"(28)
+                "compileSdkVersion"(27)
             }
 
             "autoplay" {
@@ -35,6 +49,8 @@ class PlayPublisherPluginTest {
                 "userFraction"(0.5)
                 "secretJsonBase64"("c2VjcmV0")
             }
+
+            "evaluate"()
         }
 
         val tasks = project.getTasksByName("publishApkRelease", false)
@@ -69,4 +85,20 @@ class PlayPublisherPluginTest {
 
     }
 
+    @Test
+    fun `PublishApkTask, missing 'track'`() {
+
+        thrown.expect(ProjectConfigurationException::class.java)
+        thrown.expectCause(hasMessage(equalTo("autoplay { track } property is required.")))
+
+        project.withGroovyBuilder {
+            "android" {
+                "compileSdkVersion"(27)
+            }
+            "autoplay" {
+            }
+            "evaluate"()
+        }
+    }
+
 }
\ No newline at end of file