1 files changed, 37 insertions, 0 deletions
diff --git a/spec/lib/gitlab/global_id_spec.rb b/spec/lib/gitlab/global_id_spec.rb
new file mode 100644
index 00000000000..d35b5da0b75
--- /dev/null
+++ b/spec/lib/gitlab/global_id_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::GlobalId do
+  describe '.build' do
+    set(:object) { create(:issue) }
+
+    it 'returns a standard GlobalId if only object is passed' do
+      expect(described_class.build(object).to_s).to eq(object.to_global_id.to_s)
+    end
+
+    it 'returns a GlobalId from params' do
+      expect(described_class.build(model_name: 'MyModel', id: 'myid').to_s).to eq(
+        'gid://gitlab/MyModel/myid'
+      )
+    end
+
+    it 'returns a GlobalId from object and `id` param' do
+      expect(described_class.build(object, id: 'myid').to_s).to eq(
+        'gid://gitlab/Issue/myid'
+      )
+    end
+
+    it 'returns a GlobalId from object and `model_name` param' do
+      expect(described_class.build(object, model_name: 'MyModel').to_s).to eq(
+        "gid://gitlab/MyModel/#{object.id}"
+      )
+    end
+
+    it 'returns an error if model_name and id are not able to be determined' do
+      expect { described_class.build(id: 'myid') }.to raise_error(URI::InvalidComponentError)
+      expect { described_class.build(model_name: 'MyModel') }.to raise_error(URI::InvalidComponentError)
+      expect { described_class.build }.to raise_error(URI::InvalidComponentError)
+    end
+  end
+end