1 files changed, 117 insertions, 0 deletions
diff --git a/spec/rubocop/cop/code_reuse/serializer_spec.rb b/spec/rubocop/cop/code_reuse/serializer_spec.rb
new file mode 100644
index 00000000000..4530b15eed7
--- /dev/null
+++ b/spec/rubocop/cop/code_reuse/serializer_spec.rb
@@ -0,0 +1,117 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'rubocop'
+require 'rubocop/rspec/support'
+require_relative '../../../../rubocop/cop/code_reuse/serializer'
+
+describe RuboCop::Cop::CodeReuse::Serializer do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  it 'flags the use of a Serializer in a Service class' do
+    allow(cop)
+      .to receive(:in_service_class?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class FooService
+        def execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a Service class.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a Finder' do
+    allow(cop)
+      .to receive(:in_finder?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class FooFinder
+        def execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a Finder.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a Presenter' do
+    allow(cop)
+      .to receive(:in_presenter?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class FooPresenter
+        def execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a Presenter.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a Serializer' do
+    allow(cop)
+      .to receive(:in_serializer?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class FooSerializer
+        def execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a Serializer.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a model instance method' do
+    allow(cop)
+      .to receive(:in_model?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class User < ActiveRecord::Base
+        def execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a model.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a model class method' do
+    allow(cop)
+      .to receive(:in_model?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class User < ActiveRecord::Base
+        def self.execute
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a model.
+        end
+      end
+    SOURCE
+  end
+
+  it 'flags the use of a Serializer in a worker' do
+    allow(cop)
+      .to receive(:in_worker?)
+      .and_return(true)
+
+    expect_offense(<<~SOURCE)
+      class FooWorker
+        def perform
+          FooSerializer.new.execute
+          ^^^^^^^^^^^^^^^^^ Serializers can not be used in a worker.
+        end
+      end
+    SOURCE
+  end
+end