1 files changed, 90 insertions, 0 deletions
diff --git a/spec/rubocop/cop/migration/add_timestamps_spec.rb b/spec/rubocop/cop/migration/add_timestamps_spec.rb
new file mode 100644
index 00000000000..18df62dec3e
--- /dev/null
+++ b/spec/rubocop/cop/migration/add_timestamps_spec.rb
@@ -0,0 +1,90 @@
+require 'spec_helper'
+
+require 'rubocop'
+require 'rubocop/rspec/support'
+
+require_relative '../../../../rubocop/cop/migration/add_timestamps'
+
+describe RuboCop::Cop::Migration::AddTimestamps do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+  let(:migration_with_add_timestamps) do
+    %q(
+      class Users < ActiveRecord::Migration
+        DOWNTIME = false
+
+        def change
+          add_column(:users, :username, :text)
+          add_timestamps(:users)
+        end
+      end
+    )
+  end
+
+  let(:migration_without_add_timestamps) do
+    %q(
+      class Users < ActiveRecord::Migration
+        DOWNTIME = false
+
+        def change
+          add_column(:users, :username, :text)
+        end
+      end
+    )
+  end
+
+  let(:migration_with_add_timestamps_with_timezone) do
+    %q(
+      class Users < ActiveRecord::Migration
+        DOWNTIME = false
+
+        def change
+          add_column(:users, :username, :text)
+          add_timestamps_with_timezone(:users)
+        end
+      end
+    )
+  end
+
+  context 'in migration' do
+    before do
+      allow(cop).to receive(:in_migration?).and_return(true)
+    end
+
+    it 'registers an offense when the "add_timestamps" method is used' do
+      inspect_source(cop, migration_with_add_timestamps)
+
+      aggregate_failures do
+        expect(cop.offenses.size).to eq(1)
+        expect(cop.offenses.map(&:line)).to eq([7])
+      end
+    end
+
+    it 'does not register an offense when the "add_timestamps" method is not used' do
+      inspect_source(cop, migration_without_add_timestamps)
+
+      aggregate_failures do
+        expect(cop.offenses.size).to eq(0)
+      end
+    end
+
+    it 'does not register an offense when the "add_timestamps_with_timezone" method is used' do
+      inspect_source(cop, migration_with_add_timestamps_with_timezone)
+
+      aggregate_failures do
+        expect(cop.offenses.size).to eq(0)
+      end
+    end
+  end
+
+  context 'outside of migration' do
+    it 'registers no offense' do
+      inspect_source(cop, migration_with_add_timestamps)
+      inspect_source(cop, migration_without_add_timestamps)
+      inspect_source(cop, migration_with_add_timestamps_with_timezone)
+
+      expect(cop.offenses.size).to eq(0)
+    end
+  end
+end