diff --git a/spec/controllers/relationships_controller_spec.rb b/spec/controllers/relationships_controller_spec.rb
new file mode 100644
index 00000000..6b3bed06
--- /dev/null
+++ b/spec/controllers/relationships_controller_spec.rb
@@ -0,0 +1,153 @@
+# coding: utf-8
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe RelationshipsController, type: :controller do
+  shared_examples_for "params is empty" do
+    let(:params) { {} }
+
+    include_examples "turbo does not succeed", "is required"
+  end
+
+  let!(:user) { FactoryBot.create(:user) }
+  let!(:user2) { FactoryBot.create(:user) }
+
+  describe "#create" do
+    shared_examples_for "valid relationship type" do
+      it_behaves_like "params is empty"
+
+      context "screen_name does not exist" do
+        let(:screen_name) { "peter-witzig" }
+
+        include_examples "turbo does not succeed", "not found"
+      end
+
+      context "screen_name is current user" do
+        let(:screen_name) { user.screen_name }
+
+        include_examples "turbo does not succeed", "yourself"
+      end
+
+      context "screen_name is different from current_user" do
+        let(:screen_name) { user2.screen_name }
+
+        it "creates the relationship" do
+          expect { subject }.to change { Relationship.count }.by(1)
+          expect(Relationship.last.target.screen_name).to eq(screen_name)
+        end
+      end
+    end
+
+    let(:type)        { "Sauerkraut" }
+    let(:screen_name) { user2.screen_name }
+    let(:params)      { { type: type, screen_name: screen_name } }
+
+    subject { post(:create, params: params, format: :turbo_stream) }
+
+    it_behaves_like "requires login"
+
+    context "user signed in" do
+      before(:each) { sign_in(user) }
+
+      context "type = 'follow'" do
+        let(:type) { "follow" }
+
+        include_examples "valid relationship type"
+
+        context "target user mutes source user" do
+          before do
+            user2.mute(user)
+          end
+
+          it "creates the relationship but no notification" do
+            expect { subject }.to change { Notification.count }.by(0)
+          end
+        end
+      end
+
+      context "type = 'block'" do
+        let(:type) { "block" }
+
+        include_examples "valid relationship type"
+      end
+
+      context "type = 'mute'" do
+        let(:type) { "mute" }
+
+        include_examples "valid relationship type"
+      end
+
+      context "type = 'dick'" do
+        let(:type) { "dick" }
+
+        it_behaves_like "params is empty"
+        include_examples "turbo does not succeed", "Invalid parameter"
+      end
+    end
+  end
+
+  describe "#destroy" do
+    shared_examples_for "valid relationship type" do
+      let(:screen_name) { user2.screen_name }
+
+      context "relationship exists" do
+        before do
+          user.public_send(type, user2)
+        end
+
+        it "destroys a relationship" do
+          expect { subject }.to change { Relationship.count }.by(-1)
+        end
+      end
+
+      context "relationship does not exist" do
+        it "does not change anything at all" do
+          expect { subject }.to change { Relationship.count }.by(0)
+        end
+      end
+
+      context "screen_name does not exist" do
+        let(:screen_name) { "peter-witzig" }
+
+        include_examples "turbo does not succeed", "not found"
+      end
+    end
+
+    let(:type)        { "Sauerkraut" }
+    let(:screen_name) { user2.screen_name }
+    let(:params)      { { type: type, screen_name: screen_name } }
+
+    subject { delete(:destroy, params: params, format: :turbo_stream) }
+
+    it_behaves_like "requires login"
+
+    context "user signed in" do
+      before(:each) { sign_in(user) }
+
+      context "type = 'follow'" do
+        let(:type) { "follow" }
+
+        include_examples "valid relationship type"
+      end
+
+      context "type = 'block'" do
+        let(:type) { "block" }
+
+        include_examples "valid relationship type"
+      end
+
+      context "type = 'mute'" do
+        let(:type) { "mute" }
+
+        include_examples "valid relationship type"
+      end
+
+      context "type = 'dick'" do
+        let(:type) { "dick" }
+
+        include_examples "turbo does not succeed", "Invalid parameter"
+      end
+    end
+  end
+end
diff --git a/spec/shared_examples/error_raising.rb b/spec/shared_examples/error_raising.rb
index 03290783..527318b1 100644
--- a/spec/shared_examples/error_raising.rb
+++ b/spec/shared_examples/error_raising.rb
@@ -13,3 +13,10 @@ RSpec.shared_examples_for "ajax does not succeed" do |part_of_error_message|
     expect(assigns(:response)[:message]).to include(part_of_error_message)
   end
 end
+
+RSpec.shared_examples_for "turbo does not succeed" do |part_of_error_message|
+  it "turbo does not succeed" do
+    subject
+    expect(response.body).to include(part_of_error_message)
+  end
+end