1 files changed, 40 insertions, 0 deletions
diff --git a/spec/rubocop/cop/gitlab/delegate_predicate_methods_spec.rb b/spec/rubocop/cop/gitlab/delegate_predicate_methods_spec.rb
new file mode 100644
index 00000000000..1ceff0dd681
--- /dev/null
+++ b/spec/rubocop/cop/gitlab/delegate_predicate_methods_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+require_relative '../../../../rubocop/cop/gitlab/delegate_predicate_methods'
+
+RSpec.describe RuboCop::Cop::Gitlab::DelegatePredicateMethods do
+  subject(:cop) { described_class.new }
+
+  it 'registers offense for single predicate method with allow_nil:true' do
+    expect_offense(<<~SOURCE)
+      delegate :is_foo?, :do_foo, to: :bar, allow_nil: true
+      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Using `delegate` with `allow_nil` on the following predicate methods is discouraged: is_foo?.
+    SOURCE
+  end
+
+  it 'registers offense for multiple predicate methods with allow_nil:true' do
+    expect_offense(<<~SOURCE)
+      delegate :is_foo?, :is_bar?, to: :bar, allow_nil: true
+      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Using `delegate` with `allow_nil` on the following predicate methods is discouraged: is_foo?, is_bar?.
+    SOURCE
+  end
+
+  it 'registers no offense for non-predicate method with allow_nil:true' do
+    expect_no_offenses(<<~SOURCE)
+      delegate :do_foo, to: :bar, allow_nil: true
+    SOURCE
+  end
+
+  it 'registers no offense with predicate method with allow_nil:false' do
+    expect_no_offenses(<<~SOURCE)
+      delegate :is_foo?, to: :bar, allow_nil: false
+    SOURCE
+  end
+
+  it 'registers no offense with predicate method without allow_nil' do
+    expect_no_offenses(<<~SOURCE)
+      delegate :is_foo?, to: :bar
+    SOURCE
+  end
+end