Added unit test to try to reproduce #115

Author: oliemansm

src/test/groovy/com/coxautodev/graphql/tools/EnumListParameterSpec.groovy

@@ -0,0 +1,76 @@
+package com.coxautodev.graphql.tools
+
+import graphql.GraphQL
+import graphql.execution.AsyncExecutionStrategy
+import graphql.schema.GraphQLSchema
+import spock.lang.Shared
+import spock.lang.Specification
+
+class EnumListParameterSpec extends Specification {
+
+    @Shared
+    GraphQL gql
+
+    def setupSpec() {
+        GraphQLSchema schema = SchemaParser.newParser().schemaString('''\
+                        type Query {
+                            countries(regions: [Region!]!): [Country!]!
+                        }
+                        
+                        enum Region {
+                            EUROPE
+                            ASIA
+                        }
+                        
+                        type Country {
+                            code: String!
+                            name: String!
+                            regions: [Region!]
+                        }
+                    '''.stripIndent())
+                .resolvers(new QueryResolver())
+                .build()
+                .makeExecutableSchema()
+        gql = GraphQL.newGraphQL(schema)
+                .queryExecutionStrategy(new AsyncExecutionStrategy())
+                .build()
+    }
+
+    def "query with parameter type list of enums should resolve correctly"() {
+        when:
+            def data = Utils.assertNoGraphQlErrors(gql, [regions: ["EUROPE", "ASIA"]]) {
+                '''
+                query getCountries($regions: [Region!]!) {
+                  countries(regions: $regions){
+                    code
+                    name
+                    regions
+                  }
+                }
+                '''
+            }
+
+        then:
+            data.countries == []
+    }
+
+    class QueryResolver implements GraphQLQueryResolver {
+        Set<Country> getCountries(Set<Region> regions) {
+            return Collections.emptySet()
+        }
+    }
+
+    class Country {
+        String code
+        String name
+        List<Region> regions
+    }
+
+    enum Region {
+        EUROPE,
+        ASIA
+    }
+
+}
+
+