It would be nice if #key? were aliased to #has_key? so that the have_…

…key RSpec matcher can be used instead of key?(key) eq(true)

lib/dry/container/mixin.rb

@@ -163,6 +163,7 @@ def merge(other, namespace: nil)
       def key?(key)
         config.resolver.key?(_container, key)
       end
+      alias has_key? key?
 
       # An array of registered names for the container
       #

spec/support/shared_examples/container.rb

@@ -318,6 +318,18 @@
       end
     end
 
+    describe '#has_key? is alias of #key? for spec matching' do
+      let(:key) { :key }
+
+      before do
+        container.register(key) { :item }
+      end
+
+      subject! { container }
+
+      it { is_expected.to have_key(key) }
+    end
+
     describe '#keys' do
       let(:keys) { [:key_1, :key_2] }
       let(:expected_keys) { ['key_1', 'key_2'] }