Updated hello messages

Author: Hakky54

jvm-rainbow/src/main/java/nl/altindag/jvm/rainbow/GroovyService.groovy

@@ -19,7 +19,7 @@ class GroovyService implements GreetingsService {
 
     @Override
     String hello() {
-        "hello"
+        "Greetings from Groovy!"
     }
 
 }

jvm-rainbow/src/main/java/nl/altindag/jvm/rainbow/JavaService.java

@@ -19,7 +19,7 @@ public class JavaService implements GreetingsService {
 
     @Override
     public String hello() {
-        return "hello";
+        return "Greetings from Java!";
     }
 
 }

jvm-rainbow/src/main/java/nl/altindag/jvm/rainbow/KotlinService.kt

@@ -17,8 +17,6 @@ package nl.altindag.jvm.rainbow
 
 class KotlinService : GreetingsService {
 
-    override fun hello(): String? {
-        return "hello"
-    }
+    override fun hello(): String = "Greetings from Kotlin!"
 
 }

jvm-rainbow/src/main/java/nl/altindag/jvm/rainbow/ScalaService.scala

@@ -17,6 +17,6 @@ package nl.altindag.jvm.rainbow
 
 class ScalaService extends GreetingsService {
 
-  override def hello(): String = "hello"
+  override def hello(): String = "Greetings from Scala!"
 
 }

jvm-rainbow/src/test/java/nl/altindag/jvm/rainbow/GroovyServiceShould.groovy

@@ -24,7 +24,7 @@ class GroovyServiceShould extends GroovyTestCase {
     void testSayHello() {
         def service = new GroovyService()
         def message = service.hello()
-        assertThat(message).isEqualTo("hello")
+        assertThat(message).isEqualTo("Greetings from Groovy!")
     }
 
 }

jvm-rainbow/src/test/java/nl/altindag/jvm/rainbow/JavaServiceShould.java

@@ -25,6 +25,6 @@ class JavaServiceShould {
     void sayHello() {
         var service = new JavaService();
         String message = service.hello();
-        assertThat(message).isEqualTo("hello");
+        assertThat(message).isEqualTo("Greetings from Java!");
     }
 }

jvm-rainbow/src/test/java/nl/altindag/jvm/rainbow/KotlinServiceShould.kt

@@ -24,7 +24,7 @@ class KotlinServiceShould {
     fun sayHello() {
         val service = KotlinService()
         val message = service.hello()
-        assertThat(message).isEqualTo("hello")
+        assertThat(message).isEqualTo("Greetings from Kotlin!")
     }
 
 }

jvm-rainbow/src/test/java/nl/altindag/jvm/rainbow/ScalaServiceShould.scala

@@ -22,7 +22,7 @@ class ScalaServiceShould extends AnyFunSpec {
   describe("say hello") {
     val service = new ScalaService()
     val message = service.hello()
-    assert(message == "hello")
+    assert(message == "Greetings from Scala!")
   }
 
 }