cleanup(test): remove unneeded convert functions for build_config enum (#226)

Author: kevmoo

json_serializable/test/yaml/build_config.dart

@@ -36,7 +36,7 @@ class Builder extends Object with _$BuilderSerializerMixin {
       fromJson: _autoApplyFromJson)
   final AutoApply autoApply;
 
-  @JsonKey(name: 'build_to', toJson: _buildToToJson, fromJson: _buildToFromJson)
+  @JsonKey(name: 'build_to')
   final BuildTo buildTo;
 
   final AutoApply defaultEnumTest;
@@ -84,12 +84,6 @@ AutoApply _autoApplyFromJson(String input) =>
 String _autoApplyToJson(AutoApply value) =>
     _toJson(value, _autoApplyConvert, 'autoApply');
 
-BuildTo _buildToFromJson(String input) =>
-    _fromJson(input, _buildToConvert, 'buildTo');
-
-String _buildToToJson(BuildTo value) =>
-    _toJson(value, _buildToConvert, 'buildTo');
-
 // TODO: remove all of this and annotate the fields on the enum – once we have
 // https://github.com/dart-lang/json_serializable/issues/38
 T _fromJson<T>(String input, Map<String, T> convertMap, String fieldName) {
@@ -122,8 +116,3 @@ const _autoApplyConvert = const {
   'all_packages': AutoApply.allPackages,
   'root_package': AutoApply.rootPackage
 };
-
-const _buildToConvert = const {
-  'cache': BuildTo.cache,
-  'source': BuildTo.source,
-};

json_serializable/test/yaml/build_config.g.dart

@@ -51,7 +51,7 @@ Builder _$BuilderFromJson(Map json) {
         autoApply: $checkedConvert(json, 'auto_apply',
             (v) => v == null ? null : _autoApplyFromJson(v as String)),
         buildTo: $checkedConvert(json, 'build_to',
-            (v) => v == null ? null : _buildToFromJson(v as String)),
+            (v) => $enumDecodeNullable('BuildTo', BuildTo.values, v as String)),
         defaultEnumTest: $checkedConvert(
             json,
             'defaultEnumTest',
@@ -105,7 +105,7 @@ abstract class _$BuilderSerializerMixin {
     writeNotNull('is_optional', isOptional);
     writeNotNull(
         'auto_apply', autoApply == null ? null : _autoApplyToJson(autoApply));
-    writeNotNull('build_to', buildTo == null ? null : _buildToToJson(buildTo));
+    writeNotNull('build_to', buildTo?.toString()?.split('.')?.last);
     writeNotNull(
         'defaultEnumTest', defaultEnumTest?.toString()?.split('.')?.last);
     val['builder_factories'] = builderFactories;