diff --git a/.rubocop.yml b/.rubocop.yml
index 188fe0af..70dd4a63 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -101,6 +101,8 @@ Rails/LexicallyScopedActionFilter:
   Enabled: false
 Rails/FilePath:
   EnforcedStyle: arguments
+RSpec/ImplicitExpect:
+  EnforcedStyle: should
 AllCops:
   TargetRubyVersion: 3.1.2
   NewCops: enable
diff --git a/spec/controllers/contests_controller_spec.rb b/spec/controllers/contests_controller_spec.rb
new file mode 100644
index 00000000..ed2af780
--- /dev/null
+++ b/spec/controllers/contests_controller_spec.rb
@@ -0,0 +1,48 @@
+require 'rails_helper'
+
+RSpec.describe ContestsController do
+  describe '#contest' do
+    context 'when variable assigned' do
+      before { controller.instance_variable_set :@contest, :contest }
+
+      its(:contest) { should eq :contest }
+    end
+
+    context 'when created' do
+      let(:contest) { create :contest }
+
+      before do
+        allow(controller).to receive(:params).and_return(id: contest.id.to_s)
+      end
+
+      its(:contest) { should eq contest }
+    end
+  end
+
+  describe '#collection' do
+    context 'when variable assigned' do
+      before { controller.instance_variable_set :@collection, :collection }
+
+      its(:collection) { should eq :collection }
+    end
+
+    context 'without active contest' do
+      let(:contest) { create :contest, archived: true }
+
+      before do
+        create :contest, archived: false, upload_open: false, registration_open: false
+      end
+
+      its(:collection) { should eq [contest] }
+    end
+
+    context 'with active contest' do
+      before do
+        create :contest, archived: true
+        create :contest, archived: false, upload_open: true, registration_open: true
+      end
+
+      its(:collection) { should be_empty }
+    end
+  end
+end