Add basic coverage for `UnmuteService` class (#29330)

spec/services/unmute_service_spec.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe UnmuteService do
+  describe '#call' do
+    let!(:account) { Fabricate(:account) }
+    let!(:target_account) { Fabricate(:account) }
+
+    context 'when account is muting target account' do
+      before { Fabricate :mute, account: account, target_account: target_account }
+
+      context 'when account follows target_account' do
+        before { Fabricate :follow, account: account, target_account: target_account }
+
+        it 'removes the account mute and sets up a merge' do
+          expect { subject.call(account, target_account) }
+            .to remove_account_mute
+          expect(MergeWorker).to have_enqueued_sidekiq_job(target_account.id, account.id)
+        end
+      end
+
+      context 'when account does not follow target_account' do
+        it 'removes the account mute and does not create a merge' do
+          expect { subject.call(account, target_account) }
+            .to remove_account_mute
+          expect(MergeWorker).to_not have_enqueued_sidekiq_job
+        end
+      end
+
+      def remove_account_mute
+        change { account.reload.muting?(target_account) }
+          .from(true)
+          .to(false)
+      end
+    end
+
+    context 'when account is not muting target account' do
+      it 'does nothing and returns' do
+        expect { subject.call(account, target_account) }
+          .to_not(change { account.reload.muting?(target_account) })
+        expect(MergeWorker).to_not have_enqueued_sidekiq_job
+      end
+    end
+  end
+end