yea! 😃

src/main/java/assertions/Person.java

@@ -22,4 +22,13 @@ public String getFullName(){
     public Period getAge(){
         return Period.between(birthDate, LocalDate.now());
     }
+
+    @Override
+    public String toString() {
+        return "Person{" +
+                "firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", birthDate=" + birthDate +
+                '}';
+    }
 }

src/main/java/fakes/InjectDemo.java

@@ -0,0 +1,51 @@
+package fakes;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+interface CanLog {
+  void log(String message);
+}
+
+class FileLogger implements CanLog {
+  @Override
+  public void log(String message) {
+    try {
+      Files.write(Paths.get("src/main/resources/log.txt"), message.getBytes(StandardCharsets.UTF_8));
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+}
+
+class ConsoleLogger implements CanLog {
+  @Override
+  public void log(String message) {
+    System.out.println("LOG: " + message);
+  }
+}
+
+class Logger {
+  private final CanLog canLog;
+
+  public Logger(CanLog canLog) {
+    this.canLog = canLog;
+  }
+
+  public void doLog(String message) {
+    canLog.log(message);
+  }
+}
+
+public class InjectDemo {
+
+  public static void main(String[] args) {
+    final Logger logger = new Logger(new FileLogger());
+    logger.doLog("test log 1");
+
+    final Logger logger2 = new Logger(new ConsoleLogger());
+    logger2.doLog("test log 2");
+  }
+}

src/test/java/assertions/PersonTest.java

@@ -1,5 +1,6 @@
 package assertions;
 
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 import java.time.LocalDate;
@@ -10,30 +11,62 @@ class PersonTest {
 
     @Test
     void getFullNameReturnsFirstnameSpaceLastname(){
-        // TODO implement
-        throw new IllegalArgumentException("you should implement code here");
+        String lastname = "Desax";
+        String firstname = "Gion";
+        Person p = new Person(firstname, lastname, null);
+        String fullname = firstname + " " + lastname;
+        Assertions.assertEquals(fullname, p.getFullName());
     }
 
-    // TODO some more useful tests
+    @Test
+    void getFullNameNotReturnsFirstnameSpaceLastname(){
+        String lastname = "Desax";
+        String firstname = "Gion";
+        Person p = new Person(firstname, lastname, null);
+
+        String fullName = lastname + " " + firstname;
+        Assertions.assertNotEquals(fullName,p.getFullName());
+    }
 
+   @Test
+   void getFullNameReturnsFirstCharsInBigLetters(){
+        String lastname = "Desax";
+        String firstname = "Gion";
+        Person p = new Person(firstname, lastname, null);
+        String[] arrStr = p.getFullName().split(" ");
+        for(String a : arrStr){
+            if (!Character.isUpperCase(a.charAt(0))) {
+                assert false;
+            }
+        }
+   }
 
     // --- getAge
 
     @Test
-    void getAgeReturns10YearsIfBornIn2009() throws Exception {
-        // TODO verbessern. Hinweis: Repeatable (wiederholbar) zu jeder Zeit.
-        Person p = new Person("", "", LocalDate.of(2009, 1, 1));
-
-        throw new IllegalArgumentException("you should implement code here");
+    void getAgeReturns10YearsIfBorn10YearsAgo()  {
+        Person p = new Person("", "", LocalDate.now().minusYears(10));
+        Assertions.assertEquals(10,p.getAge().getYears());
+        Assertions.assertEquals(0,p.getAge().getMonths());
+        Assertions.assertEquals(0,p.getAge().getDays());
     }
 
     @Test
-    void getAgeReturns1DayIfYesterday() throws Exception {
+    void getAgeReturns1DayIfYesterday() {
         Person p = new Person("", "", LocalDate.now().minusDays(1));
-
-        // TODO implement
-        throw new IllegalArgumentException("you should implement code here");
+        Assertions.assertEquals(0, p.getAge().getYears());
+        Assertions.assertEquals(0,p.getAge().getMonths());
+        Assertions.assertEquals(1,p.getAge().getDays());
     }
 
-    // TODO some more useful tests
+    @Test
+    void getAgeReturnIsNotTooHigh(){
+        LocalDate birthDay = LocalDate.now().plusDays(0);
+        Person p = new Person("", "", birthDay);
+        if(p.getAge().isNegative()){
+            AssertionError error = new AssertionError("LocalDate birthday " + birthDay + " is set to future");
+            System.out.println(error.getMessage());
+            assert false;
+        }
+    }
 }

src/test/java/fakes/UserControllerTest.java

@@ -11,9 +11,9 @@ class UserControllerTest {
   class create {
 
     // --- Testing with Fakes ---
-
     @Test
-    void withValidInexistingUsername_returnsOK__NO_FAKE() {
+    @org.junit.jupiter.api.Disabled
+    void withValidInexistingUsername_returnsOK__NO_FAKE_DEMO() {
       UserController ctrl = new UserController();
       User user = new User("kalua");
 
@@ -36,12 +36,14 @@ void withValidInexistingUsername_returnsOK__MOCKITO() {
     }
 
     @Test
-    void withValidInexitingUserName_addUserToDB__FAKE() {
+    void withValidInexitingUsername_addUserToDB__FAKE() {
       // TODO
+      // Der Test soll prüfen, ob der Benutzer tatsächlich der DB hinzugefügt wurde.
+      // Dazu soll ein Database Mock Objekt verwendet werden.
     }
 
     @Test
-    void withValidInexitingUserName_addUserToDB__MOCKITO() {
+    void withValidInexitingUsername_addUserToDB__MOCKITO() {
       // TODO
     }