Accept multiple default configuration blocks

lib/blacklight/configuration.rb

@@ -31,12 +31,19 @@ def property(key, default: nil)
       end
 
       def default_configuration(&block)
-        @default_configuration = block
-        @default_configuration_initialized = false
+        @default_configurations ||= []
+
+        if block
+          @default_configurations << block
+
+          block.call if @default_configuration_initialized
+        end
+
+        @default_configurations
       end
 
       def initialize_default_configuration
-        @default_configuration.call
+        @default_configurations&.map(&:call)
         @default_configuration_initialized = true
       end
 

spec/models/blacklight/configuration_spec.rb

@@ -689,4 +689,26 @@
       expect { config.view.a = '123' }.to raise_error(FrozenError)
     end
   end
+
+  describe '.default_configuration' do
+    it 'adds additional default configuration properties' do
+      Blacklight::Configuration.default_configuration do
+        Blacklight::Configuration.default_values[:a] = '123'
+      end
+
+      Blacklight::Configuration.default_configuration do
+        Blacklight::Configuration.default_values[:b] = 'abc'
+      end
+
+      expect(Blacklight::Configuration.default_values[:a]).to eq '123'
+      expect(Blacklight::Configuration.default_values[:b]).to eq 'abc'
+    ensure
+      # reset the default configuration
+      Blacklight::Configuration.default_values.delete(:a)
+      Blacklight::Configuration.default_values.delete(:b)
+
+      Blacklight::Configuration.default_configuration.delete_at(1)
+      Blacklight::Configuration.default_configuration.delete_at(2)
+    end
+  end
 end