Merge pull request #316 from Earlopain/error-skip-ensure

Fix an error for `Minitest/SkipEnsure` when only `ensure` has a body

Author: koic

changelog/fix_error_skip_ensure.md

@@ -0,0 +1 @@
+* [#314](https://github.com/rubocop/rubocop-minitest/pull/314): Fix an error for `Minitest/SkipEnsure` when only `ensure` has a body. ([@earlopain][])

lib/rubocop/cop/minitest/skip_ensure.rb

@@ -75,7 +75,9 @@ def on_ensure(node)
         private
 
         def find_skip(node)
-          node.node_parts.first.descendants.detect { |n| n.send_type? && n.receiver.nil? && n.method?(:skip) }
+          return unless (body = node.node_parts.first)
+
+          body.descendants.detect { |n| n.send_type? && n.receiver.nil? && n.method?(:skip) }
         end
 
         def use_skip_in_rescue?(skip_method)

test/rubocop/cop/minitest/skip_ensure_test.rb

@@ -119,4 +119,13 @@ def test_skip_with_receiver
       end
     RUBY
   end
+
+  def test_registers_no_offese_when_ensure_only
+    assert_no_offenses(<<~RUBY)
+      def test_ensure_only
+      ensure
+        do_something
+      end
+    RUBY
+  end
 end