Test AdvanceTeamsInIntermediateStage Interactor

spec/interactors/advance_teams_in_intermediate_stage_interactor_spec.rb

@@ -1,18 +1,52 @@
 # frozen_string_literal: true
 
 RSpec.describe AdvanceTeamsInIntermediateStage do
+  shared_examples_for 'succeeding context' do
+    it 'succeeds' do
+      expect(context).to be_a_success
+    end
+  end
+
+  shared_examples_for 'failing context' do
+    it 'fails' do
+      expect(context).to be_a_failure
+    end
+  end
+
   context 'intermediate_stage is nil' do
     let(:context) do
       AdvanceTeamsInIntermediateStage.call(intermediate_stage: nil)
     end
 
-    it 'succeeds' do
+    it_behaves_like 'succeeding context'
-      expect(context).to be_a_success
-    end
 
     it 'doesn\'t call PopulateMatchBelow' do
       expect(PopulateMatchBelowAndSave).not_to receive(:call)
       context
     end
   end
+
+  context 'intermediate_stage is an realistic stage' do
+    let(:context) do
+      AdvanceTeamsInIntermediateStage.call(intermediate_stage: create(:playoff_stage, match_type: :single_team_match))
+    end
+
+    context 'PopulateMatchBelow succeeds' do
+      before do
+        expect(class_double('PopulateMatchBelowAndSave').as_stubbed_const(transfer_nested_constants: true))
+          .to receive(:call).exactly(4).times.and_return(double(:context, success?: true))
+      end
+
+      it_behaves_like 'succeeding context'
+    end
+
+    context 'PopulateMatchBelow fails' do
+      before do
+        expect(class_double('PopulateMatchBelowAndSave').as_stubbed_const(transfer_nested_constants: true))
+          .to receive(:call).and_return(double(:context, success?: false))
+      end
+
+      it_behaves_like 'failing context'
+    end
+  end
 end