Updated ExtensionTest and wiki

TelegramBots.wiki/abilities/Ability-Extensions.md

@@ -35,6 +35,20 @@ public class MrBadGuy implements AbilityExtension {
       return new MrBadGuy();
     }
     
+    // Override creatorId
+ }
+```
+
+It's also possible to add extensions in the constructor by using the `addExtension()` or `addExtensions()` method:
+
+```java
+ public class YourAwesomeBot implements AbilityBot {
+
+    public YourAwesomeBot() {
+      super(/* pass required args ... */);
+      addExtensions(new MrGoodGuy(), new MrBadGuy());
+    }
+    
     // Override creatorId
  }
 ```

telegrambots-abilities/src/test/java/org/telegram/abilitybots/api/bot/ExtensionTest.java

@@ -32,6 +32,7 @@ class ExtensionTest {
     assertTrue(hasAbilityNamed("direct"), "Failed to find Ability in directly declared in root extension/bot");
     assertTrue(hasAbilityNamed("returningSuperClass0abc"), "Failed to find Ability in directly declared in extension returned by method returning the AbilityExtension class");
     assertTrue(hasAbilityNamed("returningSubClass0abc"), "Failed to find Ability in directly declared in extension returned by method returning the AbilityExtension subclass");
+    assertTrue(hasAbilityNamed("addedInConstructor0abc"), "Failed to find Ability in directly declared in extension added in the constructor");
   }
 
   private boolean hasAbilityNamed(String name) {
@@ -41,6 +42,7 @@ class ExtensionTest {
   public static class ExtensionUsingBot extends AbilityBot {
     ExtensionUsingBot() {
       super("", "", offlineInstance("testing"));
+      addExtension(new AbilityBotExtension("addedInConstructor"));
     }
 
     @Override