1 files changed, 31 insertions, 0 deletions
diff --git a/spec/models/custom_emoji_spec.rb b/spec/models/custom_emoji_spec.rb
new file mode 100644
index 00000000000..2b569b6097d
--- /dev/null
+++ b/spec/models/custom_emoji_spec.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CustomEmoji do
+  describe 'Associations' do
+    it { is_expected.to belong_to(:namespace) }
+    it { is_expected.to have_db_column(:file) }
+    it { is_expected.to validate_length_of(:name).is_at_most(36) }
+    it { is_expected.to validate_presence_of(:name) }
+  end
+
+  describe 'exclusion of duplicated emoji' do
+    let(:emoji_name) { Gitlab::Emoji.emojis_names.sample }
+
+    it 'disallows emoji names of built-in emoji' do
+      new_emoji = build(:custom_emoji, name: emoji_name)
+
+      expect(new_emoji).not_to be_valid
+      expect(new_emoji.errors.messages).to eq(name: ["#{emoji_name} is already being used for another emoji"])
+    end
+
+    it 'disallows duplicate custom emoji names within namespace' do
+      old_emoji = create(:custom_emoji)
+      new_emoji = build(:custom_emoji, name: old_emoji.name, namespace: old_emoji.namespace)
+
+      expect(new_emoji).not_to be_valid
+      expect(new_emoji.errors.messages).to eq(name: ["has already been taken"])
+    end
+  end
+end