An integration test for optional results (#151)

* An integration test for optional results.

See #150

* Refactoring into current package structure.

* Cleanup (this will be squashed :o)

src/test/kotlin/com/expedia/graphql/integration/OptionalResultsTest.kt

@@ -0,0 +1,40 @@
+package com.expedia.graphql.integration
+
+import com.expedia.graphql.TopLevelObject
+import com.expedia.graphql.testSchemaConfig
+import com.expedia.graphql.toSchema
+import graphql.GraphQL
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertNull
+
+class OptionalResultsTest {
+    @Test
+    fun `SchemaGenerator generates a simple GraphQL schema`() {
+        val schema = toSchema(
+            listOf(TopLevelObject(QueryObject())),
+            listOf(),
+            config = testSchemaConfig
+        )
+        val graphQL = GraphQL.newGraphQL(schema).build()
+
+        val result = graphQL.execute("{optionalResults{required optional}}")
+        val data: Map<String, Map<String, Any>>? = result.getData()
+
+        val optionalResults = data?.get("optionalResults")
+        assertNotNull(optionalResults)
+        assertEquals(2, optionalResults.size)
+        assertEquals("req", optionalResults["required"])
+        assertNull(optionalResults["optional"])
+    }
+}
+
+data class HasOptionalData(
+    val required: String,
+    val optional: String?
+)
+
+class QueryObject {
+    fun optionalResults() = HasOptionalData("req", null)
+}