diff --git a/spec/services/group_stage_service_spec.rb b/spec/services/group_stage_service_spec.rb
new file mode 100644
index 0000000..fe24961
--- /dev/null
+++ b/spec/services/group_stage_service_spec.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+RSpec.describe GroupStageService do
+  before do
+    @stage = create(:stage)
+    @groups = create_list(:group, 4)
+    @groups_list = [ %w(one two three), %w(a b c)] # @groups.map{ |group| [group.teams.map{|group| group.name}]}
+  end
+  describe 'generate_group_stage method' do
+    it 'returns a stage object' do
+      group_stage = GroupStageService.generate_group_stage(@groups)
+      expect(group_stage).to be_a(Stage)
+    end
+
+    it 'returns false when given different sizes of groups' do
+      unequal_groups = @groups_list
+      unequal_groups.first.pop
+      group_stage = GroupStageService.generate_group_stage(@groups_list)
+    end
+  end
+
+  describe 'get_group_object_from' do
+    groups = [%w(one two three), %w(four five six)]
+
+  end
+
+  describe 'generate_all_matches_between' do
+
+  end
+end