done

build.gradle

@@ -10,6 +10,8 @@ repositories {
 }
 
 dependencies {
+    implementation 'org.junit.jupiter:junit-jupiter:5.7.0'
+    implementation 'junit:junit:4.13.1'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.1'
     testImplementation 'org.junit.jupiter:junit-jupiter-params:5.7.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'

src/main/java/de/htwberlin/madlib/MadLib.java

@@ -1,5 +1,10 @@
 package de.htwberlin.madlib;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Stream;
+
 public class MadLib {
 
   static final String[] ADJECTIVES = new String[]{"amazing", "exciting", "excellent", "emotional", "easy", "difficult", "curious", "beautiful"};
@@ -8,7 +13,24 @@ public class MadLib {
 
   public String create() {
     // TODO: implement this method
+    String random_adjective = randomWordOf(ADJECTIVES);
+    String random_verb = randomWordOf(VERBS);
+    String other_random_verb = randomWordOf(VERBS);
+    String random_famous_person= randomWordOf(FAMOUS_PERSONS);
 
-    return ""; // TODO: this is only here so that the code can be compiled, please replace it with your result
+    String toReturnString = "Java programming is so "
+            +  random_adjective
+            +" ! It makes me so excited all the time because I love to "
+            +  random_verb
+            + ". Stay hydrated and "
+            +  other_random_verb
+            + " like you are "
+            +  random_famous_person
+            + " !";
+    return toReturnString; // TODO: this is only here so that the code can be compiled, please replace it with your result
+  }
+  private String randomWordOf (String[] targetArray){
+    return targetArray[(int)Math.floor(Math.random()*targetArray.length)];
   }
+
 }

src/test/java/de/htwberlin/madlib/MadLibTest.java

@@ -0,0 +1,31 @@
+package de.htwberlin.madlib;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MadLibTest {
+    MadLib testObject = new MadLib();
+    @Test
+    @DisplayName("The result string should starts with \"Java programming is so\" ")
+    void startWithPattern() {
+        String expectedStartWith = "Java programming is so";
+        boolean actual = testObject.create().startsWith(expectedStartWith);
+        assertEquals(true,actual);
+    }
+
+    @Test
+    @DisplayName("Should contains adjective from ADJECTIVES array, verbs from VERBS array, and famous person from FAMOUS-PERSONS")
+    void containRequiredWords(){
+        String returnString = testObject.create();
+        boolean expected = true;
+        boolean actual1 = Arrays.stream(MadLib.ADJECTIVES).anyMatch(i -> returnString.contains(i));
+        boolean actual2 = Arrays.stream(MadLib.VERBS).anyMatch(i -> returnString.contains(i));
+        boolean actual3 = Arrays.stream(MadLib.FAMOUS_PERSONS).anyMatch(i -> returnString.contains(i));
+        boolean actual = actual1 && actual2 && actual3;
+        assertEquals(expected,actual);
+    }
+}