1 files changed, 1 insertions, 36 deletions
diff --git a/spec/lib/gitlab/sql/union_spec.rb b/spec/lib/gitlab/sql/union_spec.rb
index c8be83c093d..a41551e25bf 100644
--- a/spec/lib/gitlab/sql/union_spec.rb
+++ b/spec/lib/gitlab/sql/union_spec.rb
@@ -3,40 +3,5 @@
 require 'spec_helper'
 
 RSpec.describe Gitlab::SQL::Union do
-  let(:relation_1) { User.where(email: 'alice@example.com').select(:id) }
-  let(:relation_2) { User.where(email: 'bob@example.com').select(:id) }
-
-  def to_sql(relation)
-    relation.reorder(nil).to_sql
-  end
-
-  describe '#to_sql' do
-    it 'returns a String joining relations together using a UNION' do
-      union = described_class.new([relation_1, relation_2])
-
-      expect(union.to_sql).to eq("(#{to_sql(relation_1)})\nUNION\n(#{to_sql(relation_2)})")
-    end
-
-    it 'skips Model.none segements' do
-      empty_relation = User.none
-      union = described_class.new([empty_relation, relation_1, relation_2])
-
-      expect {User.where("users.id IN (#{union.to_sql})").to_a}.not_to raise_error
-      expect(union.to_sql).to eq("(#{to_sql(relation_1)})\nUNION\n(#{to_sql(relation_2)})")
-    end
-
-    it 'uses UNION ALL when removing duplicates is disabled' do
-      union = described_class
-        .new([relation_1, relation_2], remove_duplicates: false)
-
-      expect(union.to_sql).to include('UNION ALL')
-    end
-
-    it 'returns `NULL` if all relations are empty' do
-      empty_relation = User.none
-      union = described_class.new([empty_relation, empty_relation])
-
-      expect(union.to_sql).to eq('NULL')
-    end
-  end
+  it_behaves_like 'SQL set operator', 'UNION'
 end