Fix spec

spec/operations/form/base_spec.rb

@@ -361,17 +361,17 @@
       subject(:pretty_inspect) { form.pretty_inspect }
 
       specify do
-        expect(pretty_inspect).to eq(<<~INSPECT)
-          #<Dummy::Form
-           attributes={:name=>nil,
-             :tags=>[],
-             :author=>
-              #<Dummy::Author
-               attributes={:title=>nil},
-               errors=#<ActiveModel::Errors []>>,
-             :posts=>[]},
-           errors=#<ActiveModel::Errors []>>
-        INSPECT
+        expect(pretty_inspect).to match(%r{
+          #<Dummy::Form\n
+          \s+attributes=\{:name=>nil,\n
+          \s+:tags=>\[\],\n
+          \s+:author=>\n
+          \s+\#<Dummy::Author\n
+          \s+attributes=\{:title=>nil\},\n
+          \s+errors=\#<ActiveModel::Errors[^\[]+\[\]>>,\n
+          \s+:posts=>\[\]\},\n
+          \s+errors=\#<ActiveModel::Errors[^\[]+\[\]>>
+        }x)
       end
     end
   end