Add support for underscored argument name in accept_argument

lib/rspec/graphql_matchers/accept_argument.rb

@@ -17,12 +17,15 @@ def initialize(expected_arg_name)
         end
 
         @expected_arg_name = expected_arg_name.to_s
+        @expected_camel_arg_name = GraphQL::Schema::Member::BuildType.camelize(
+          @expected_arg_name
+        )
       end
 
       def matches?(graph_object)
         @graph_object = graph_object
 
-        @actual_argument = field_arguments[@expected_arg_name]
+        @actual_argument = field_arguments[@expected_arg_name] || field_arguments[@expected_camel_arg_name]
         return false if @actual_argument.nil?
 
         @results = @expectations.select do |matcher|

spec/rspec/accept_argument_matcher_spec.rb

@@ -9,6 +9,18 @@ module RSpec::GraphqlMatchers
         expect(a_type).to accept_argument(:id)
       end
 
+      it 'passes with the underscored argument name' do
+        expect(a_type).to accept_argument(:is_test)
+      end
+
+      it 'passes with the camel cased argument name' do
+        expect(a_type).to accept_argument(:isTest)
+      end
+
+      it 'matches a non camelized argument with the underscored argument name' do
+        expect(a_type).to accept_argument(:not_camelized)
+      end
+
       it 'fails when the type does not define the expected field' do
         expect { expect(a_type).to accept_argument(:ids) }
           .to fail_with(
@@ -89,6 +101,8 @@ module RSpec::GraphqlMatchers
 
           argument :id, GraphQL::Types::String, required: false
           argument :other, GraphQL::Types::ID, required: true
+          argument :is_test, GraphQL::Types::Boolean, required: false
+          argument :not_camelized, GraphQL::Types::Boolean, required: false, camelize: false
         end
       end
 
@@ -102,6 +116,8 @@ module RSpec::GraphqlMatchers
 
           argument :id, types.String
           argument :other, !types.ID
+          argument :isTest, types.Boolean
+          argument :not_camelized, types.Boolean
         end
       end