1 files changed, 25 insertions, 0 deletions
diff --git a/spec/rubocop/cop/gitlab/union_spec.rb b/spec/rubocop/cop/gitlab/union_spec.rb
new file mode 100644
index 00000000000..5b06f30b25f
--- /dev/null
+++ b/spec/rubocop/cop/gitlab/union_spec.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'rubocop'
+require 'rubocop/rspec/support'
+require_relative '../../../../rubocop/cop/gitlab/union'
+
+describe RuboCop::Cop::Gitlab::Union do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  it 'flags the use of Gitlab::SQL::Union.new' do
+    expect_offense(<<~SOURCE)
+    Gitlab::SQL::Union.new([foo])
+    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use the `FromUnion` concern, instead of using `Gitlab::SQL::Union` directly
+    SOURCE
+  end
+
+  it 'does not flag the use of Gitlab::SQL::Union in a spec' do
+    allow(cop).to receive(:in_spec?).and_return(true)
+
+    expect_no_offenses('Gitlab::SQL::Union.new([foo])')
+  end
+end