Add tests for `UserBan` model

spec/models/user_ban_spec.rb

@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe UserBan, type: :model do
+  describe "validations" do
+    it { should belong_to(:user) }
+    it { should belong_to(:banned_by).class_name("User").optional }
+  end
+
+  describe "scopes" do
+    describe ".current" do
+      let(:user) { FactoryBot.create(:user) }
+      let!(:current_ban) { UserBan.create(user: user, expires_at: Time.now.utc + 1.day) }
+      let!(:expired_ban) { UserBan.create(user: user, expires_at: Time.now.utc - 1.day) }
+
+      it "returns only current bans" do
+        expect(UserBan.current).to eq([current_ban])
+      end
+    end
+  end
+
+  describe "#permanent?" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:ban) { UserBan.create(user: user, expires_at: expires_at) }
+
+    context "ban is permanent" do
+      let(:expires_at) { nil }
+
+      it "returns true" do
+        expect(ban.permanent?).to eq(true)
+      end
+    end
+
+    context "ban is not permanent" do
+      let(:expires_at) { Time.now.utc + 1.day }
+
+      it "returns false" do
+        expect(ban.permanent?).to be false
+      end
+    end
+  end
+
+  describe "#current?" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:ban) { UserBan.create(user: user, expires_at: expires_at) }
+
+    context "ban is current" do
+      let(:expires_at) { Time.now.utc + 1.day }
+
+      it "returns true" do
+        expect(ban.current?).to eq(true)
+      end
+    end
+
+    context "ban is not current" do
+      let(:expires_at) { Time.now.utc - 1.day }
+
+      it "returns false" do
+        expect(ban.current?).to eq(false)
+      end
+    end
+  end
+end