Conditionally generate protocol spec

Author: Matt Muller

gems/smithy/lib/smithy/generators/client.rb

@@ -67,7 +67,8 @@ def spec_files
         Enumerator.new do |e|
           e.yield 'spec/spec_helper.rb', Views::Client::SpecHelper.new(@plan).render
           e.yield "spec/#{@gem_name}/endpoint_provider_spec.rb", Views::Client::EndpointProviderSpec.new(@plan).render
-          e.yield "spec/#{@gem_name}/protocol_spec.rb", Views::Client::ProtocolSpec.new(@plan).render
+          protocol_spec = Views::Client::ProtocolSpec.new(@plan)
+          e.yield "spec/#{@gem_name}/protocol_spec.rb", protocol_spec.render unless protocol_spec.empty?
         end
       end
 

gems/smithy/lib/smithy/views/client/protocol_spec.rb

@@ -32,6 +32,10 @@ def vendor_code
             .reduce({}, :merge)
         end
 
+        def empty?
+          @all_operation_tests.empty?
+        end
+
         # @api private
         class OperationTests
           def initialize(model, id, operation, vendor_code)