retrofit-graphql-codegen-core/co.anitrend.retrofit.graphql.codegen.serialization/SerializationRoundTripTest

SerializationRoundTripTest

class SerializationRoundTripTest

Tests that generated types correctly serialize and deserialize JSON.

Layer E: Structural JSON Round-Trip Tests.

These tests verify that generated types can:

Parse fixture JSON into generated types, then re-serialize back.
Construct instances programmatically, serialize, then parse back.

JSON structures are compared using parsed JsonElement trees (not textual key ordering) to verify structural equality.

Gson is used for the actual serialization because it does not require a compiler plugin. The generated source code is compiled at test time via the embedded K2JVMCompiler.

For kotlinx.serialization-specific features (like polymorphic interface discrimination via __typename), source-level annotation verification is used since the kotlinx compiler plugin is not available at test time.

Constructors

SerializationRoundTripTest

constructor()

Functions

alias field JSON key is the alias not the schema name

fun alias field JSON key is the alias not the schema name()

collision fields round trip with both wire names preserved

fun collision fields round trip with both wire names preserved()

concrete subtypes have SerialName matching __typename values

fun concrete subtypes have SerialName matching __typename values()

custom scalar DateTime round trips parse then serialize through Gson

fun custom scalar DateTime round trips parse then serialize through Gson()

enum field in response round trips with wire name preserved

fun enum field in response round trips with wire name preserved()

enum round trips construct then parse with keyword values

fun enum round trips construct then parse with keyword values()

enum round trips parse then serialize with lowercase values

fun enum round trips parse then serialize with lowercase values()

enum round trips parse then serialize with uppercase values

fun enum round trips parse then serialize with uppercase values()

explicit null value is preserved in JSON

fun explicit null value is preserved in JSON()

field present in schema but absent in JSON deserializes as null

fun field present in schema but absent in JSON deserializes as null()

GraphContainer with data only round trips parse then serialize

fun GraphContainer with data only round trips parse then serialize()

GraphContainer with data plus errors round trips parse then serialize

fun GraphContainer with data plus errors round trips parse then serialize()

GraphContainer with partial data (null data) round trips parse then serialize

fun GraphContainer with partial data (null data) round trips parse then serialize()

keyword field wire name is preserved in JSON not escaped kotlin name

fun keyword field wire name is preserved in JSON not escaped kotlin name()

list with null elements preserves null entries

fun list with null elements preserves null entries()

nested input object with keyword fields round trips

fun nested input object with keyword fields round trips()

null list container serializes as null by default

fun null list container serializes as null by default()

ordinary response object round trips parse then serialize

fun ordinary response object round trips parse then serialize()

polymorphic sealed interface has JsonClassDiscriminator with __typename

fun polymorphic sealed interface has JsonClassDiscriminator with __typename()

polymorphic subtype deserializes to correct type based on __typename

fun polymorphic subtype deserializes to correct type based on __typename()

response object round trips construct then parse

fun response object round trips construct then parse()

fun setUp()

variable class round trips construct then parse

fun variable class round trips construct then parse()

variable class with keyword fields round trips parse then serialize

fun variable class with keyword fields round trips parse then serialize()