1 files changed, 94 insertions, 0 deletions
diff --git a/spec/models/wiki_page/slug_spec.rb b/spec/models/wiki_page/slug_spec.rb
new file mode 100644
index 00000000000..324dea6b320
--- /dev/null
+++ b/spec/models/wiki_page/slug_spec.rb
@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe WikiPage::Slug do
+  let_it_be(:meta) { create(:wiki_page_meta) }
+
+  describe 'Associations' do
+    it { is_expected.to belong_to(:wiki_page_meta) }
+
+    it 'refers correctly to the wiki_page_meta' do
+      created = create(:wiki_page_slug, wiki_page_meta: meta)
+
+      expect(created.reload.wiki_page_meta).to eq(meta)
+    end
+  end
+
+  describe 'scopes' do
+    describe 'canonical' do
+      subject { described_class.canonical }
+
+      context 'there are no slugs' do
+        it { is_expected.to be_empty }
+      end
+
+      context 'there are some non-canonical slugs' do
+        before do
+          create(:wiki_page_slug)
+        end
+
+        it { is_expected.to be_empty }
+      end
+
+      context 'there is at least one canonical slugs' do
+        before do
+          create(:wiki_page_slug, :canonical)
+        end
+
+        it { is_expected.not_to be_empty }
+      end
+    end
+  end
+
+  describe 'Validations' do
+    let(:canonical) { false }
+
+    subject do
+      build(:wiki_page_slug, canonical: canonical, wiki_page_meta: meta)
+    end
+
+    it { is_expected.to validate_presence_of(:slug) }
+    it { is_expected.to validate_uniqueness_of(:slug).scoped_to(:wiki_page_meta_id) }
+
+    describe 'only_one_slug_can_be_canonical_per_meta_record' do
+      context 'there are no other slugs' do
+        it { is_expected.to be_valid }
+
+        context 'the current slug is canonical' do
+          let(:canonical) { true }
+
+          it { is_expected.to be_valid }
+        end
+      end
+
+      context 'there are other slugs, but they are not canonical' do
+        before do
+          create(:wiki_page_slug, wiki_page_meta: meta)
+        end
+
+        it { is_expected.to be_valid }
+
+        context 'the current slug is canonical' do
+          let(:canonical) { true }
+
+          it { is_expected.to be_valid }
+        end
+      end
+
+      context 'there is already a canonical slug' do
+        before do
+          create(:wiki_page_slug, canonical: true, wiki_page_meta: meta)
+        end
+
+        it { is_expected.to be_valid }
+
+        context 'the current slug is canonical' do
+          let(:canonical) { true }
+
+          it { is_expected.not_to be_valid }
+        end
+      end
+    end
+  end
+end