add tests

build.gradle

@@ -12,6 +12,8 @@ repositories {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+
+    testImplementation "org.junit.jupiter:junit-jupiter:5.5.2"
 }
 
 compileKotlin {
@@ -21,6 +23,13 @@ compileTestKotlin {
     kotlinOptions.jvmTarget = "1.8"
 }
 
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+}
+
 Properties properties = new Properties()
 File file = rootProject.file('local.properties')
 if (file.exists()) {

src/test/kotlin/net/volcanomobile/weservsdk/WeservTests.kt

@@ -0,0 +1,14 @@
+package net.volcanomobile.weservsdk
+
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+
+class WeservTests {
+
+    @Test
+    fun `no Url throws exception`() {
+        Assertions.assertThrows(IllegalArgumentException::class.java) {
+            weserv {  }
+        }
+    }
+}