Fix inconsistencies with Dash defaults

The normal behavior of Dash with respect to property defaults differed
from the behavior of a Dash/Trash with IgnoreUndeclared mixed in. This
is because some situations called the defaults and some did not.

This change normalizes the behavior so that all situations where the
defaults should be used to override unset values behave consistently,
as well as all situations where the default should not override a `nil`
value.

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/hashie/dash_spec.rb b/spec/hashie/dash_spec.rb
index 5f3bfe3..3adfc8f 100644
--- a/spec/hashie/dash_spec.rb
+++ b/spec/hashie/dash_spec.rb
@@ -606,3 +606,13 @@ context 'with method access' do
     it { is_expected.to eq true }
   end
 end
+
+RSpec.describe Hashie::Dash do
+  let(:test) do
+    Class.new(Hashie::Dash) do
+      property :description, default: ''
+    end
+  end
+
+  include_examples 'Dash default handling', :description
+end