Fixed issue with nested input types fix #77

Author: oliemansm

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

@@ -0,0 +1,61 @@
+package com.coxautodev.graphql.tools
+
+import spock.lang.Specification
+
+class NestedInputTypesSpec extends Specification {
+
+    def "nested input types are parsed"() {
+        when:
+            SchemaParser.newParser().schemaString('''\
+                        type Query {
+                            materials(filter: MaterialFilter): [Material!]!
+                        }
+                        
+                        input MaterialFilter {
+                            title: String
+                            requestFilter: RequestFilter
+                        }
+                        
+                        input RequestFilter {
+                            and: [RequestFilter!]
+                            or: [RequestFilter!]
+                            discountTypeFilter: DiscountTypeFilter
+                        }
+                        
+                        input DiscountTypeFilter {
+                            name: String
+                        }
+                        
+                        type Material {
+                            id: ID!
+                        }
+                    ''').resolvers(new QueryResolver())
+                    .build()
+
+        then:
+            noExceptionThrown()
+    }
+
+    class QueryResolver implements GraphQLQueryResolver {
+        List<Material> materials(MaterialFilter filter) { Collections.emptyList() }
+    }
+
+    class Material {
+        Long id
+    }
+
+    class MaterialFilter {
+        String title
+        RequestFilter requestFilter
+    }
+
+    class RequestFilter {
+        List<RequestFilter> and
+        List<RequestFilter> or
+        DiscountTypeFilter discountTypeFilter
+    }
+
+    class DiscountTypeFilter {
+        String name
+    }
+}