First runnable tests for Database / Commented out Good/BadCasesTests (not relevant to this branch)

src/main/java/hhn/temp/project/provider/SimpleDatabaseManager.java

@@ -0,0 +1,32 @@
+package hhn.temp.project.provider;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.List;
+
+public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
+  @Override
+  public void saveObjects(Collection<E> objects) {
+
+  }
+
+  @Override
+  public Collection<E> getObjects() {
+    return List.of();
+  }
+
+  @Override
+  public void saveObject(E object) {
+
+  }
+
+  @Override
+  public E getObject(int id) {
+    return null;
+  }
+
+  @Override
+  public void connect() {
+    //...
+  }
+}