[TASK] Add methods to add a task before/after a task in a task group

src/Task/GroupTask.php

@@ -49,4 +49,31 @@ public function setGroup(array $group): void
     {
         $this->group = $group;
     }
+
+    public function addTaskBefore(string $task, string $addTask): void
+    {
+        $this->addTask($task, $addTask);
+    }
+
+    public function addTaskAfter(string $task, string $addTask): void
+    {
+        $this->addTask($task, $addTask, 'after');
+    }
+
+    public function addTask(string $task, string $addTask, string $position = 'before'): void
+    {
+        $taskPosition = array_search($task, $this->group);
+        if(!$taskPosition) {
+            throw new \InvalidArgumentException("Task `$task` not found.");
+        }
+
+        switch ($position) {
+            case 'before':
+                array_splice($this->group, $taskPosition, 0, [$addTask]);
+                break;
+            case 'after':
+                array_splice($this->group, $taskPosition + 1, 0, [$addTask]);
+                break;
+        }
+    }
 }