Fix after_all hooks running too soon

src/spectator/context.cr

@@ -50,11 +50,13 @@ module Spectator
 
     def run_after_all_hooks
       unless @after_all_hooks_run
+        if all_examples.all?(&.finished?)
           @after_all_hooks.each do |hook|
             hook.call
           end
           @after_all_hooks_run = true
         end
+      end
       if (parent = @parent)
         parent.run_after_all_hooks
       end

src/spectator/dsl.cr

@@ -161,6 +161,7 @@ module Spectator
           begin
             Example%example.new.%run({% for v, i in var_names %}%var{i}{% if i < var_names.size - 1 %}, {% end %}{% end %})
           ensure
+            @finished = true
             context.run_after_each_hooks
             context.run_after_all_hooks
           end

src/spectator/example.cr

@@ -3,6 +3,7 @@ require "./source"
 module Spectator
   abstract class Example
     getter context : Context
+    getter? finished = false
 
     def initialize(@context)
     end