graphql_test.go

package graphql_test

import (
	"context"
	"errors"
	"fmt"
	"testing"
	"time"

	"github.com/graph-gophers/graphql-go"
	gqlerrors "github.com/graph-gophers/graphql-go/errors"
	"github.com/graph-gophers/graphql-go/example/starwars"
	"github.com/graph-gophers/graphql-go/gqltesting"
)

type helloWorldResolver1 struct{}

func (r *helloWorldResolver1) Hello() string {
	return "Hello world!"
}

type helloWorldResolver2 struct{}

func (r *helloWorldResolver2) Hello(ctx context.Context) (string, error) {
	return "Hello world!", nil
}

type helloSnakeResolver1 struct{}

func (r *helloSnakeResolver1) HelloHTML() string {
	return "Hello snake!"
}

func (r *helloSnakeResolver1) SayHello(args struct{ FullName string }) string {
	return "Hello " + args.FullName + "!"
}

type helloSnakeResolver2 struct{}

func (r *helloSnakeResolver2) HelloHTML(ctx context.Context) (string, error) {
	return "Hello snake!", nil
}

func (r *helloSnakeResolver2) SayHello(ctx context.Context, args struct{ FullName string }) (string, error) {
	return "Hello " + args.FullName + "!", nil
}

type theNumberResolver struct {
	number int32
}

func (r *theNumberResolver) TheNumber() int32 {
	return r.number
}

func (r *theNumberResolver) ChangeTheNumber(args struct{ NewNumber int32 }) *theNumberResolver {
	r.number = args.NewNumber
	return r
}

type timeResolver struct{}

func (r *timeResolver) AddHour(args struct{ Time graphql.Time }) graphql.Time {
	return graphql.Time{Time: args.Time.Add(time.Hour)}
}

type echoResolver struct{}

func (r *echoResolver) Echo(args struct{ Value *string }) *string {
	return args.Value
}

var starwarsSchema = graphql.MustParseSchema(starwars.Schema, &starwars.Resolver{})

type ResolverError interface {
	error
	Extensions() map[string]interface{}
}

type resolverNotFoundError struct {
	Code    string `json:"code"`
	Message string `json:"message"`
}

func (e resolverNotFoundError) Error() string {
	return fmt.Sprintf("Error [%s]: %s", e.Code, e.Message)
}

func (e resolverNotFoundError) Extensions() map[string]interface{} {
	return map[string]interface{}{
		"code":    e.Code,
		"message": e.Message,
	}
}

type findDroidResolver struct{}

func (r *findDroidResolver) FindDroid(ctx context.Context) (string, error) {
	return "", resolverNotFoundError{
		Code:    "NotFound",
		Message: "This is not the droid you are looking for",
	}
}

var (
	droidNotFoundError = resolverNotFoundError{
		Code:    "NotFound",
		Message: "This is not the droid you are looking for",
	}
	quoteError = errors.New("Bleep bloop")

	r2d2          = &droidResolver{name: "R2-D2"}
	c3po          = &droidResolver{name: "C-3PO"}
	notFoundDroid = &droidResolver{err: droidNotFoundError}
)

type findDroidsResolver struct{}

func (r *findDroidsResolver) FindDroids(ctx context.Context) []*droidResolver {
	return []*droidResolver{r2d2, notFoundDroid, c3po}
}

func (r *findDroidsResolver) FindNilDroids(ctx context.Context) *[]*droidResolver {
	return &[]*droidResolver{r2d2, nil, c3po}
}

type findDroidOrHumanResolver struct{}

func (r *findDroidOrHumanResolver) FindHuman(ctx context.Context) (*string, error) {
	human := "human"
	return &human, nil
}

func (r *findDroidOrHumanResolver) FindDroid(ctx context.Context) (*droidResolver, error) {
	return nil, notFoundDroid.err
}

type droidResolver struct {
	name string
	err  error
}

func (d *droidResolver) Name() (string, error) {
	if d.err != nil {
		return "", d.err
	}
	return d.name, nil
}

func (d *droidResolver) Quotes() ([]string, error) {
	switch d.name {
	case r2d2.name:
		return nil, quoteError
	case c3po.name:
		return []string{"We're doomed!", "R2-D2, where are you?"}, nil
	}
	return nil, nil
}

type discussPlanResolver struct{}

func (r *discussPlanResolver) DismissVader(ctx context.Context) (string, error) {
	return "", errors.New("I find your lack of faith disturbing")
}

func TestHelloWorld(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					hello: String!
				}
			`, &helloWorldResolver1{}),
			Query: `
				{
					hello
				}
			`,
			ExpectedResult: `
				{
					"hello": "Hello world!"
				}
			`,
		},

		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					hello: String!
				}
			`, &helloWorldResolver2{}),
			Query: `
				{
					hello
				}
			`,
			ExpectedResult: `
				{
					"hello": "Hello world!"
				}
			`,
		},
	})
}

func TestHelloSnake(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					hello_html: String!
				}
			`, &helloSnakeResolver1{}),
			Query: `
				{
					hello_html
				}
			`,
			ExpectedResult: `
				{
					"hello_html": "Hello snake!"
				}
			`,
		},

		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					hello_html: String!
				}
			`, &helloSnakeResolver2{}),
			Query: `
				{
					hello_html
				}
			`,
			ExpectedResult: `
				{
					"hello_html": "Hello snake!"
				}
			`,
		},
	})
}

func TestHelloSnakeArguments(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					say_hello(full_name: String!): String!
				}
			`, &helloSnakeResolver1{}),
			Query: `
				{
					say_hello(full_name: "Rob Pike")
				}
			`,
			ExpectedResult: `
				{
					"say_hello": "Hello Rob Pike!"
				}
			`,
		},

		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					say_hello(full_name: String!): String!
				}
			`, &helloSnakeResolver2{}),
			Query: `
				{
					say_hello(full_name: "Rob Pike")
				}
			`,
			ExpectedResult: `
				{
					"say_hello": "Hello Rob Pike!"
				}
			`,
		},
	})
}

func TestBasic(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					hero {
						id
						name
						friends {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"hero": {
						"id": "2001",
						"name": "R2-D2",
						"friends": [
							{
								"name": "Luke Skywalker"
							},
							{
								"name": "Han Solo"
							},
							{
								"name": "Leia Organa"
							}
						]
					}
				}
			`,
		},
	})
}

type testNilInterfaceResolver struct{}

func (r *testNilInterfaceResolver) A() interface{ Z() int32 } {
	return nil
}

func (r *testNilInterfaceResolver) B() (interface{ Z() int32 }, error) {
	return nil, errors.New("x")
}

func (r *testNilInterfaceResolver) C() (interface{ Z() int32 }, error) {
	return nil, nil
}

func TestNilInterface(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					a: T
					b: T
					c: T
				}

				type T {
					z: Int!
				}
			`, &testNilInterfaceResolver{}),
			Query: `
				{
					a { z }
					b { z }
					c { z }
				}
			`,
			ExpectedResult: `
				{
					"a": null,
					"b": null,
					"c": null
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       "x",
					Path:          []interface{}{"b"},
					ResolverError: errors.New("x"),
				},
			},
		},
	})
}

func TestErrorPropagationInLists(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findDroids: [Droid!]!
				}
				type Droid {
					name: String!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findDroids {
						name
					}
				}
			`,
			ExpectedResult: `
				null
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       droidNotFoundError.Error(),
					Path:          []interface{}{"findDroids", 1, "name"},
					ResolverError: droidNotFoundError,
					Extensions:    map[string]interface{}{"code": droidNotFoundError.Code, "message": droidNotFoundError.Message},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findDroids: [Droid]!
				}
				type Droid {
					name: String!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findDroids {
						name
					}
				}
			`,
			ExpectedResult: `
				{
					"findDroids": [
						{
							"name": "R2-D2"
						},
						null,
						{
							"name": "C-3PO"
						}
					]
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       droidNotFoundError.Error(),
					Path:          []interface{}{"findDroids", 1, "name"},
					ResolverError: droidNotFoundError,
					Extensions:    map[string]interface{}{"code": droidNotFoundError.Code, "message": droidNotFoundError.Message},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findNilDroids: [Droid!]
				}
				type Droid {
					name: String!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findNilDroids {
						name
					}
				}
			`,
			ExpectedResult: `
				{
					"findNilDroids": null
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message: `graphql: got nil for non-null "Droid"`,
					Path:    []interface{}{"findNilDroids", 1},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findNilDroids: [Droid]
				}
				type Droid {
					name: String!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findNilDroids {
						name
					}
				}
			`,
			ExpectedResult: `
				{
					"findNilDroids": [
						{
							"name": "R2-D2"
						},
						null,
						{
							"name": "C-3PO"
						}
					]
				}
			`,
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findDroids: [Droid]!
				}
				type Droid {
					quotes: [String!]!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findDroids {
						quotes
					}
				}
			`,
			ExpectedResult: `
				{
					"findDroids": [
						null,
						{
							"quotes": []
						},
						{
							"quotes": [
								"We're doomed!",
								"R2-D2, where are you?"
							]
						}
					]
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       quoteError.Error(),
					ResolverError: quoteError,
					Path:          []interface{}{"findDroids", 0, "quotes"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					findNilDroids: [Droid!]
				}
				type Droid {
					name: String!
					quotes: [String!]!
				}
			`, &findDroidsResolver{}),
			Query: `
				{
					findNilDroids {
						name
						quotes
					}
				}
			`,
			ExpectedResult: `
				{
					"findNilDroids": null
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       quoteError.Error(),
					ResolverError: quoteError,
					Path:          []interface{}{"findNilDroids", 0, "quotes"},
				},
				&gqlerrors.QueryError{
					Message: `graphql: got nil for non-null "Droid"`,
					Path:    []interface{}{"findNilDroids", 1},
				},
			},
		},
	})
}

func TestErrorWithExtensions(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					FindDroid: Droid!
					FindHuman: String
				}
				type Droid {
					Name: String!
				}
			`, &findDroidOrHumanResolver{}),
			Query: `
				{
					FindDroid {
						Name
					}
					FindHuman
				}
			`,
			ExpectedResult: `
				null
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       droidNotFoundError.Error(),
					Path:          []interface{}{"FindDroid"},
					ResolverError: droidNotFoundError,
					Extensions:    map[string]interface{}{"code": droidNotFoundError.Code, "message": droidNotFoundError.Message},
				},
			},
		},
	})
}

func TestErrorWithNoExtensions(t *testing.T) {
	err := errors.New("I find your lack of faith disturbing")

	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					DismissVader: String!
				}
			`, &discussPlanResolver{}),
			Query: `
				{
					DismissVader
				}
			`,
			ExpectedResult: `
				null
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				&gqlerrors.QueryError{
					Message:       err.Error(),
					Path:          []interface{}{"DismissVader"},
					ResolverError: err,
					Extensions:    nil,
				},
			},
		},
	})
}

func TestArguments(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					human(id: "1000") {
						name
						height
					}
				}
			`,
			ExpectedResult: `
				{
					"human": {
						"name": "Luke Skywalker",
						"height": 1.72
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					human(id: "1000") {
						name
						height(unit: FOOT)
					}
				}
			`,
			ExpectedResult: `
				{
					"human": {
						"name": "Luke Skywalker",
						"height": 5.6430448
					}
				}
			`,
		},
	})
}

func TestAliases(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					empireHero: hero(episode: EMPIRE) {
						name
					}
					jediHero: hero(episode: JEDI) {
						name
					}
				}
			`,
			ExpectedResult: `
				{
					"empireHero": {
						"name": "Luke Skywalker"
					},
					"jediHero": {
						"name": "R2-D2"
					}
				}
			`,
		},
	})
}

func TestFragments(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					leftComparison: hero(episode: EMPIRE) {
						...comparisonFields
						...height
					}
					rightComparison: hero(episode: JEDI) {
						...comparisonFields
						...height
					}
				}

				fragment comparisonFields on Character {
					name
					appearsIn
					friends {
						name
					}
				}

				fragment height on Human {
					height
				}
			`,
			ExpectedResult: `
				{
					"leftComparison": {
						"name": "Luke Skywalker",
						"appearsIn": [
							"NEWHOPE",
							"EMPIRE",
							"JEDI"
						],
						"friends": [
							{
								"name": "Han Solo"
							},
							{
								"name": "Leia Organa"
							},
							{
								"name": "C-3PO"
							},
							{
								"name": "R2-D2"
							}
						],
						"height": 1.72
					},
					"rightComparison": {
						"name": "R2-D2",
						"appearsIn": [
							"NEWHOPE",
							"EMPIRE",
							"JEDI"
						],
						"friends": [
							{
								"name": "Luke Skywalker"
							},
							{
								"name": "Han Solo"
							},
							{
								"name": "Leia Organa"
							}
						]
					}
				}
			`,
		},
	})
}

func TestVariables(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				query HeroNameAndFriends($episode: Episode) {
					hero(episode: $episode) {
						name
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode": "JEDI",
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2"
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				query HeroNameAndFriends($episode: Episode) {
					hero(episode: $episode) {
						name
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode": "EMPIRE",
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "Luke Skywalker"
					}
				}
			`,
		},

		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					echo(value: String): String
				}
			`, &echoResolver{}),
			Query: `
				query Echo($value:String = "default"){
					echo(value:$value)
				}
			`,
			ExpectedResult: `
				{
					"echo": "default"
				}
			`,
		},
	})
}

func TestSkipDirective(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				query Hero($episode: Episode, $withoutFriends: Boolean!) {
					hero(episode: $episode) {
						name
						friends @skip(if: $withoutFriends) {
							name
						}
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode":        "JEDI",
				"withoutFriends": true,
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2"
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				query Hero($episode: Episode, $withoutFriends: Boolean!) {
					hero(episode: $episode) {
						name
						friends @skip(if: $withoutFriends) {
							name
						}
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode":        "JEDI",
				"withoutFriends": false,
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2",
						"friends": [
							{
								"name": "Luke Skywalker"
							},
							{
								"name": "Han Solo"
							},
							{
								"name": "Leia Organa"
							}
						]
					}
				}
			`,
		},
	})
}

func TestIncludeDirective(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				query Hero($episode: Episode, $withFriends: Boolean!) {
					hero(episode: $episode) {
						name
						...friendsFragment @include(if: $withFriends)
					}
				}

				fragment friendsFragment on Character {
					friends {
						name
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode":     "JEDI",
				"withFriends": false,
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2"
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				query Hero($episode: Episode, $withFriends: Boolean!) {
					hero(episode: $episode) {
						name
						...friendsFragment @include(if: $withFriends)
					}
				}

				fragment friendsFragment on Character {
					friends {
						name
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode":     "JEDI",
				"withFriends": true,
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2",
						"friends": [
							{
								"name": "Luke Skywalker"
							},
							{
								"name": "Han Solo"
							},
							{
								"name": "Leia Organa"
							}
						]
					}
				}
			`,
		},
	})
}

type testDeprecatedDirectiveResolver struct{}

func (r *testDeprecatedDirectiveResolver) A() int32 {
	return 0
}

func (r *testDeprecatedDirectiveResolver) B() int32 {
	return 0
}

func (r *testDeprecatedDirectiveResolver) C() int32 {
	return 0
}

func TestDeprecatedDirective(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					a: Int!
					b: Int! @deprecated
					c: Int! @deprecated(reason: "We don't like it")
				}
			`, &testDeprecatedDirectiveResolver{}),
			Query: `
				{
					__type(name: "Query") {
						fields {
							name
						}
						allFields: fields(includeDeprecated: true) {
							name
							isDeprecated
							deprecationReason
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__type": {
						"fields": [
							{ "name": "a" }
						],
						"allFields": [
							{ "name": "a", "isDeprecated": false, "deprecationReason": null },
							{ "name": "b", "isDeprecated": true, "deprecationReason": "No longer supported" },
							{ "name": "c", "isDeprecated": true, "deprecationReason": "We don't like it" }
						]
					}
				}
			`,
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
				}

				enum Test {
					A
					B @deprecated
					C @deprecated(reason: "We don't like it")
				}
			`, &testDeprecatedDirectiveResolver{}),
			Query: `
				{
					__type(name: "Test") {
						enumValues {
							name
						}
						allEnumValues: enumValues(includeDeprecated: true) {
							name
							isDeprecated
							deprecationReason
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__type": {
						"enumValues": [
							{ "name": "A" }
						],
						"allEnumValues": [
							{ "name": "A", "isDeprecated": false, "deprecationReason": null },
							{ "name": "B", "isDeprecated": true, "deprecationReason": "No longer supported" },
							{ "name": "C", "isDeprecated": true, "deprecationReason": "We don't like it" }
						]
					}
				}
			`,
		},
	})
}

func TestInlineFragments(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				query HeroForEpisode($episode: Episode!) {
					hero(episode: $episode) {
						name
						... on Droid {
							primaryFunction
						}
						... on Human {
							height
						}
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode": "JEDI",
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2",
						"primaryFunction": "Astromech"
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				query HeroForEpisode($episode: Episode!) {
					hero(episode: $episode) {
						name
						... on Droid {
							primaryFunction
						}
						... on Human {
							height
						}
					}
				}
			`,
			Variables: map[string]interface{}{
				"episode": "EMPIRE",
			},
			ExpectedResult: `
				{
					"hero": {
						"name": "Luke Skywalker",
						"height": 1.72
					}
				}
			`,
		},
	})
}

func TestTypeName(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					search(text: "an") {
						__typename
						... on Human {
							name
						}
						... on Droid {
							name
						}
						... on Starship {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"search": [
						{
							"__typename": "Human",
							"name": "Han Solo"
						},
						{
							"__typename": "Human",
							"name": "Leia Organa"
						},
						{
							"__typename": "Starship",
							"name": "TIE Advanced x1"
						}
					]
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					human(id: "1000") {
						__typename
						name
					}
				}
			`,
			ExpectedResult: `
				{
					"human": {
						"__typename": "Human",
						"name": "Luke Skywalker"
					}
				}
			`,
		},
	})
}

func TestConnections(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					hero {
						name
						friendsConnection {
							totalCount
							pageInfo {
								startCursor
								endCursor
								hasNextPage
							}
							edges {
								cursor
								node {
									name
								}
							}
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2",
						"friendsConnection": {
							"totalCount": 3,
							"pageInfo": {
								"startCursor": "Y3Vyc29yMQ==",
								"endCursor": "Y3Vyc29yMw==",
								"hasNextPage": false
							},
							"edges": [
								{
									"cursor": "Y3Vyc29yMQ==",
									"node": {
										"name": "Luke Skywalker"
									}
								},
								{
									"cursor": "Y3Vyc29yMg==",
									"node": {
										"name": "Han Solo"
									}
								},
								{
									"cursor": "Y3Vyc29yMw==",
									"node": {
										"name": "Leia Organa"
									}
								}
							]
						}
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					hero {
						name
						friendsConnection(first: 1, after: "Y3Vyc29yMQ==") {
							totalCount
							pageInfo {
								startCursor
								endCursor
								hasNextPage
							}
							edges {
								cursor
								node {
									name
								}
							}
						}
					},
					moreFriends: hero {
						name
						friendsConnection(first: 1, after: "Y3Vyc29yMg==") {
							totalCount
							pageInfo {
								startCursor
								endCursor
								hasNextPage
							}
							edges {
								cursor
								node {
									name
								}
							}
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"hero": {
						"name": "R2-D2",
						"friendsConnection": {
							"totalCount": 3,
							"pageInfo": {
								"startCursor": "Y3Vyc29yMg==",
								"endCursor": "Y3Vyc29yMg==",
								"hasNextPage": true
							},
							"edges": [
								{
									"cursor": "Y3Vyc29yMg==",
									"node": {
										"name": "Han Solo"
									}
								}
							]
						}
					},
					"moreFriends": {
						"name": "R2-D2",
						"friendsConnection": {
							"totalCount": 3,
							"pageInfo": {
								"startCursor": "Y3Vyc29yMw==",
								"endCursor": "Y3Vyc29yMw==",
								"hasNextPage": false
							},
							"edges": [
							{
								"cursor": "Y3Vyc29yMw==",
								"node": {
									"name": "Leia Organa"
								}
							}
							]
						}
					}
				}
			`,
		},
	})
}

func TestMutation(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					reviews(episode: JEDI) {
						stars
						commentary
					}
				}
			`,
			ExpectedResult: `
				{
					"reviews": []
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				mutation CreateReviewForEpisode($ep: Episode!, $review: ReviewInput!) {
					createReview(episode: $ep, review: $review) {
						stars
						commentary
					}
				}
			`,
			Variables: map[string]interface{}{
				"ep": "JEDI",
				"review": map[string]interface{}{
					"stars":      5,
					"commentary": "This is a great movie!",
				},
			},
			ExpectedResult: `
				{
					"createReview": {
						"stars": 5,
						"commentary": "This is a great movie!"
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				mutation CreateReviewForEpisode($ep: Episode!, $review: ReviewInput!) {
					createReview(episode: $ep, review: $review) {
						stars
						commentary
					}
				}
			`,
			Variables: map[string]interface{}{
				"ep": "EMPIRE",
				"review": map[string]interface{}{
					"stars": float64(4),
				},
			},
			ExpectedResult: `
				{
					"createReview": {
						"stars": 4,
						"commentary": null
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					reviews(episode: JEDI) {
						stars
						commentary
					}
				}
			`,
			ExpectedResult: `
				{
					"reviews": [{
						"stars": 5,
						"commentary": "This is a great movie!"
					}]
				}
			`,
		},
	})
}

func TestIntrospection(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					__schema {
						types {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__schema": {
						"types": [
							{ "name": "Boolean" },
							{ "name": "Character" },
							{ "name": "Droid" },
							{ "name": "Episode" },
							{ "name": "Float" },
							{ "name": "FriendsConnection" },
							{ "name": "FriendsEdge" },
							{ "name": "Human" },
							{ "name": "ID" },
							{ "name": "Int" },
							{ "name": "LengthUnit" },
							{ "name": "Mutation" },
							{ "name": "PageInfo" },
							{ "name": "Query" },
							{ "name": "Review" },
							{ "name": "ReviewInput" },
							{ "name": "SearchResult" },
							{ "name": "Starship" },
							{ "name": "String" },
							{ "name": "__Directive" },
							{ "name": "__DirectiveLocation" },
							{ "name": "__EnumValue" },
							{ "name": "__Field" },
							{ "name": "__InputValue" },
							{ "name": "__Schema" },
							{ "name": "__Type" },
							{ "name": "__TypeKind" }
						]
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					__schema {
						queryType {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__schema": {
						"queryType": {
							"name": "Query"
						}
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					a: __type(name: "Droid") {
						name
						kind
						interfaces {
							name
						}
						possibleTypes {
							name
						}
					},
					b: __type(name: "Character") {
						name
						kind
						interfaces {
							name
						}
						possibleTypes {
							name
						}
					}
					c: __type(name: "SearchResult") {
						name
						kind
						interfaces {
							name
						}
						possibleTypes {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"a": {
						"name": "Droid",
						"kind": "OBJECT",
						"interfaces": [
							{
								"name": "Character"
							}
						],
						"possibleTypes": null
					},
					"b": {
						"name": "Character",
						"kind": "INTERFACE",
						"interfaces": null,
						"possibleTypes": [
							{
								"name": "Human"
							},
							{
								"name": "Droid"
							}
						]
					},
					"c": {
						"name": "SearchResult",
						"kind": "UNION",
						"interfaces": null,
						"possibleTypes": [
							{
								"name": "Human"
							},
							{
								"name": "Droid"
							},
							{
								"name": "Starship"
							}
						]
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					__type(name: "Droid") {
						name
						fields {
							name
							args {
								name
								type {
									name
								}
								defaultValue
							}
							type {
								name
								kind
							}
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__type": {
						"name": "Droid",
						"fields": [
							{
								"name": "id",
								"args": [],
								"type": {
									"name": null,
									"kind": "NON_NULL"
								}
							},
							{
								"name": "name",
								"args": [],
								"type": {
									"name": null,
									"kind": "NON_NULL"
								}
							},
							{
								"name": "friends",
								"args": [],
								"type": {
									"name": null,
									"kind": "LIST"
								}
							},
							{
								"name": "friendsConnection",
								"args": [
									{
										"name": "first",
										"type": {
											"name": "Int"
										},
										"defaultValue": null
									},
									{
										"name": "after",
										"type": {
											"name": "ID"
										},
										"defaultValue": null
									}
								],
								"type": {
									"name": null,
									"kind": "NON_NULL"
								}
							},
							{
								"name": "appearsIn",
								"args": [],
								"type": {
									"name": null,
									"kind": "NON_NULL"
								}
							},
							{
								"name": "primaryFunction",
								"args": [],
								"type": {
									"name": "String",
									"kind": "SCALAR"
								}
							}
						]
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					__type(name: "Episode") {
						enumValues {
							name
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"__type": {
						"enumValues": [
							{
								"name": "NEWHOPE"
							},
							{
								"name": "EMPIRE"
							},
							{
								"name": "JEDI"
							}
						]
					}
				}
			`,
		},

		{
			Schema: starwarsSchema,
			Query: `
				{
					__schema {
						directives {
							name
							description
							locations
							args {
								name
								description
								type {
									kind
									ofType {
										kind
										name
									}
								}
							}
						}
					}
				}
			`,
			ExpectedResult: `
				{
						"__schema": {
							"directives": [
								{
									"name": "deprecated",
									"description": "Marks an element of a GraphQL schema as no longer supported.",
									"locations": [
										"FIELD_DEFINITION",
										"ENUM_VALUE"
									],
									"args": [
										{
											"name": "reason",
											"description": "Explains why this element was deprecated, usually also including a suggestion\nfor how to access supported similar data. Formatted in\n[Markdown](https://daringfireball.net/projects/markdown/).",
											"type": {
												"kind": "SCALAR",
												"ofType": null
											}
										}
									]
								},
								{
									"name": "include",
									"description": "Directs the executor to include this field or fragment only when the ` + "`" + `if` + "`" + ` argument is true.",
									"locations": [
										"FIELD",
										"FRAGMENT_SPREAD",
										"INLINE_FRAGMENT"
									],
									"args": [
										{
											"name": "if",
											"description": "Included when true.",
											"type": {
												"kind": "NON_NULL",
												"ofType": {
													"kind": "SCALAR",
													"name": "Boolean"
												}
											}
										}
									]
								},
								{
									"name": "skip",
									"description": "Directs the executor to skip this field or fragment when the ` + "`" + `if` + "`" + ` argument is true.",
									"locations": [
										"FIELD",
										"FRAGMENT_SPREAD",
										"INLINE_FRAGMENT"
									],
									"args": [
										{
											"name": "if",
											"description": "Skipped when true.",
											"type": {
												"kind": "NON_NULL",
												"ofType": {
													"kind": "SCALAR",
													"name": "Boolean"
												}
											}
										}
									]
								}
							]
						}
					}
			`,
		},
	})
}

func TestMutationOrder(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
					mutation: Mutation
				}

				type Query {
					theNumber: Int!
				}

				type Mutation {
					changeTheNumber(newNumber: Int!): Query
				}
			`, &theNumberResolver{}),
			Query: `
				mutation {
					first: changeTheNumber(newNumber: 1) {
						theNumber
					}
					second: changeTheNumber(newNumber: 3) {
						theNumber
					}
					third: changeTheNumber(newNumber: 2) {
						theNumber
					}
				}
			`,
			ExpectedResult: `
				{
					"first": {
						"theNumber": 1
					},
					"second": {
						"theNumber": 3
					},
					"third": {
						"theNumber": 2
					}
				}
			`,
		},
	})
}

func TestTime(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					addHour(time: Time = "2001-02-03T04:05:06Z"): Time!
				}

				scalar Time
			`, &timeResolver{}),
			Query: `
				query($t: Time!) {
					a: addHour(time: $t)
					b: addHour
				}
			`,
			Variables: map[string]interface{}{
				"t": time.Date(2000, 2, 3, 4, 5, 6, 0, time.UTC),
			},
			ExpectedResult: `
				{
					"a": "2000-02-03T05:05:06Z",
					"b": "2001-02-03T05:05:06Z"
				}
			`,
		},
	})
}

type resolverWithUnexportedMethod struct{}

func (r *resolverWithUnexportedMethod) changeTheNumber(args struct{ NewNumber int32 }) int32 {
	return args.NewNumber
}

func TestUnexportedMethod(t *testing.T) {
	_, err := graphql.ParseSchema(`
		schema {
			mutation: Mutation
		}

		type Mutation {
			changeTheNumber(newNumber: Int!): Int!
		}
	`, &resolverWithUnexportedMethod{})
	if err == nil {
		t.Error("error expected")
	}
}

type resolverWithUnexportedField struct{}

func (r *resolverWithUnexportedField) ChangeTheNumber(args struct{ newNumber int32 }) int32 {
	return args.newNumber
}

func TestUnexportedField(t *testing.T) {
	_, err := graphql.ParseSchema(`
		schema {
			mutation: Mutation
		}

		type Mutation {
			changeTheNumber(newNumber: Int!): Int!
		}
	`, &resolverWithUnexportedField{})
	if err == nil {
		t.Error("error expected")
	}
}

type StringEnum string

const (
	EnumOption1 StringEnum = "Option1"
	EnumOption2 StringEnum = "Option2"
)

type IntEnum int

const (
	IntEnum0 IntEnum = iota
	IntEnum1
)

func (e IntEnum) String() string {
	switch int(e) {
	case 0:
		return "Int0"
	case 1:
		return "Int1"
	default:
		return "IntN"
	}
}

func (IntEnum) ImplementsGraphQLType(name string) bool {
	return name == "IntEnum"
}

func (e *IntEnum) UnmarshalGraphQL(input interface{}) error {
	if str, ok := input.(string); ok {
		switch str {
		case "Int0":
			*e = IntEnum(0)
		case "Int1":
			*e = IntEnum(1)
		default:
			*e = IntEnum(-1)
		}
		return nil
	}
	return fmt.Errorf("wrong type for IntEnum: %T", input)
}

type inputResolver struct{}

func (r *inputResolver) Int(args struct{ Value int32 }) int32 {
	return args.Value
}

func (r *inputResolver) Float(args struct{ Value float64 }) float64 {
	return args.Value
}

func (r *inputResolver) String(args struct{ Value string }) string {
	return args.Value
}

func (r *inputResolver) Boolean(args struct{ Value bool }) bool {
	return args.Value
}

func (r *inputResolver) Nullable(args struct{ Value *int32 }) *int32 {
	return args.Value
}

func (r *inputResolver) List(args struct{ Value []*struct{ V int32 } }) []int32 {
	l := make([]int32, len(args.Value))
	for i, entry := range args.Value {
		l[i] = entry.V
	}
	return l
}

func (r *inputResolver) NullableList(args struct{ Value *[]*struct{ V int32 } }) *[]*int32 {
	if args.Value == nil {
		return nil
	}
	l := make([]*int32, len(*args.Value))
	for i, entry := range *args.Value {
		if entry != nil {
			l[i] = &entry.V
		}
	}
	return &l
}

func (r *inputResolver) StringEnumValue(args struct{ Value string }) string {
	return args.Value
}

func (r *inputResolver) NullableStringEnumValue(args struct{ Value *string }) *string {
	return args.Value
}

func (r *inputResolver) StringEnum(args struct{ Value StringEnum }) StringEnum {
	return args.Value
}

func (r *inputResolver) NullableStringEnum(args struct{ Value *StringEnum }) *StringEnum {
	return args.Value
}

func (r *inputResolver) IntEnumValue(args struct{ Value string }) string {
	return args.Value
}

func (r *inputResolver) NullableIntEnumValue(args struct{ Value *string }) *string {
	return args.Value
}

func (r *inputResolver) IntEnum(args struct{ Value IntEnum }) IntEnum {
	return args.Value
}

func (r *inputResolver) NullableIntEnum(args struct{ Value *IntEnum }) *IntEnum {
	return args.Value
}

type recursive struct {
	Next *recursive
}

func (r *inputResolver) Recursive(args struct{ Value *recursive }) int32 {
	n := int32(0)
	v := args.Value
	for v != nil {
		v = v.Next
		n++
	}
	return n
}

func (r *inputResolver) ID(args struct{ Value graphql.ID }) graphql.ID {
	return args.Value
}

func TestInput(t *testing.T) {
	coercionSchema := graphql.MustParseSchema(`
		schema {
			query: Query
		}

		type Query {
			int(value: Int!): Int!
			float(value: Float!): Float!
			string(value: String!): String!
			boolean(value: Boolean!): Boolean!
			nullable(value: Int): Int
			list(value: [Input!]!): [Int!]!
			nullableList(value: [Input]): [Int]
			stringEnumValue(value: StringEnum!): StringEnum!
			nullableStringEnumValue(value: StringEnum): StringEnum
			stringEnum(value: StringEnum!): StringEnum!
			nullableStringEnum(value: StringEnum): StringEnum
			intEnumValue(value: IntEnum!): IntEnum!
			nullableIntEnumValue(value: IntEnum): IntEnum
			intEnum(value: IntEnum!): IntEnum!
			nullableIntEnum(value: IntEnum): IntEnum
			recursive(value: RecursiveInput!): Int!
			id(value: ID!): ID!
		}

		input Input {
			v: Int!
		}

		input RecursiveInput {
			next: RecursiveInput
		}

		enum StringEnum {
			Option1
			Option2
		}

		enum IntEnum {
			Int0
			Int1
		}
	`, &inputResolver{})
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: coercionSchema,
			Query: `
				{
					int(value: 42)
					float1: float(value: 42)
					float2: float(value: 42.5)
					string(value: "foo")
					boolean(value: true)
					nullable1: nullable(value: 42)
					nullable2: nullable(value: null)
					list1: list(value: [{v: 41}, {v: 42}, {v: 43}])
					list2: list(value: {v: 42})
					nullableList1: nullableList(value: [{v: 41}, null, {v: 43}])
					nullableList2: nullableList(value: null)
					stringEnumValue(value: Option1)
					nullableStringEnumValue1: nullableStringEnum(value: Option1)
					nullableStringEnumValue2: nullableStringEnum(value: null)
					stringEnum(value: Option2)
					nullableStringEnum1: nullableStringEnum(value: Option2)
					nullableStringEnum2: nullableStringEnum(value: null)
					intEnumValue(value: Int1)
					nullableIntEnumValue1: nullableIntEnumValue(value: Int1)
					nullableIntEnumValue2: nullableIntEnumValue(value: null)
					intEnum(value: Int1)
					nullableIntEnum1: nullableIntEnum(value: Int1)
					nullableIntEnum2: nullableIntEnum(value: null)
					recursive(value: {next: {next: {}}})
					intID: id(value: 1234)
					strID: id(value: "1234")
				}
			`,
			ExpectedResult: `
				{
					"int": 42,
					"float1": 42,
					"float2": 42.5,
					"string": "foo",
					"boolean": true,
					"nullable1": 42,
					"nullable2": null,
					"list1": [41, 42, 43],
					"list2": [42],
					"nullableList1": [41, null, 43],
					"nullableList2": null,
					"stringEnumValue": "Option1",
					"nullableStringEnumValue1": "Option1",
					"nullableStringEnumValue2": null,
					"stringEnum": "Option2",
					"nullableStringEnum1": "Option2",
					"nullableStringEnum2": null,
					"intEnumValue": "Int1",
					"nullableIntEnumValue1": "Int1",
					"nullableIntEnumValue2": null,
					"intEnum": "Int1",
					"nullableIntEnum1": "Int1",
					"nullableIntEnum2": null,
					"recursive": 3,
					"intID": "1234",
					"strID": "1234"
				}
			`,
		},
	})
}

func TestComposedFragments(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: starwarsSchema,
			Query: `
				{
					composed: hero(episode: EMPIRE) {
						name
						...friendsNames
						...friendsIds
					}
				}

				fragment friendsNames on Character {
					name
					friends {
						name
					}
				}

				fragment friendsIds on Character {
					name
					friends {
						id
					}
				}
			`,
			ExpectedResult: `
				{
					"composed": {
						"name": "Luke Skywalker",
						"friends": [
							{
								"id": "1002",
								"name": "Han Solo"
							},
							{
								"id": "1003",
								"name": "Leia Organa"
							},
							{
								"id": "2000",
								"name": "C-3PO"
							},
							{
								"id": "2001",
								"name": "R2-D2"
							}
						]
					}
				}
			`,
		},
	})
}

var (
	exampleError = fmt.Errorf("This is an error")

	nilChildErrorString = `graphql: got nil for non-null "Child"`
)

type childResolver struct{}

func (r *childResolver) TriggerError() (string, error) {
	return "This will never be returned to the client", exampleError
}
func (r *childResolver) NoError() string {
	return "no error"
}
func (r *childResolver) Child() *childResolver {
	return &childResolver{}
}
func (r *childResolver) NilChild() *childResolver {
	return nil
}

func TestErrorPropagation(t *testing.T) {
	gqltesting.RunTests(t, []*gqltesting.Test{
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					triggerError: String!
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					triggerError
				}
			`,
			ExpectedResult: `
				null
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message:       exampleError.Error(),
					ResolverError: exampleError,
					Path:          []interface{}{"triggerError"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					child: Child
				}

				type Child {
					noError: String!
					triggerError: String!
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					child {
						noError
						triggerError
					}
				}
			`,
			ExpectedResult: `
				{
					"noError": "no error",
					"child": null
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message:       exampleError.Error(),
					ResolverError: exampleError,
					Path:          []interface{}{"child", "triggerError"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					child: Child
				}

				type Child {
					noError: String!
					triggerError: String!
					child: Child!
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					child {
						noError
						child {
							noError
							triggerError
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"noError": "no error",
					"child": null
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message:       exampleError.Error(),
					ResolverError: exampleError,
					Path:          []interface{}{"child", "child", "triggerError"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					child: Child
				}

				type Child {
					noError: String!
					triggerError: String!
					child: Child
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					child {
						noError
						child {
							noError
							triggerError
						}
					}
				}
			`,
			ExpectedResult: `
				{
					"noError": "no error",
					"child": {
						"noError": "no error",
						"child": null
					}
				}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message:       exampleError.Error(),
					ResolverError: exampleError,
					Path:          []interface{}{"child", "child", "triggerError"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					child: Child!
				}

				type Child {
					noError: String!
					nilChild: Child!
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					child {
						nilChild {
							noError
						}
					}
				}
			`,
			ExpectedResult: `
				null
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message: nilChildErrorString,
					Path:    []interface{}{"child", "nilChild"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					noError: String!
					child: Child
				}

				type Child {
					noError: String!
					nilChild: Child!
				}
			`, &childResolver{}),
			Query: `
				{
					noError
					child {
						noError
						nilChild {
							noError
						}
					}
				}
			`,
			ExpectedResult: `
			{
				"noError": "no error",
				"child": null
			}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message: nilChildErrorString,
					Path:    []interface{}{"child", "nilChild"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					child: Child
				}

				type Child {
					triggerError: String!
					child: Child
					nilChild: Child!
				}
			`, &childResolver{}),
			Query: `
				{
					child {
						child {
							triggerError
							child {
								nilChild {
									triggerError
								}
							}
						}
					}
				}
			`,
			ExpectedResult: `
			{
				"child": {
					"child": null
				}
			}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message: nilChildErrorString,
					Path:    []interface{}{"child", "child", "child", "nilChild"},
				},
				{
					Message:       exampleError.Error(),
					ResolverError: exampleError,
					Path:          []interface{}{"child", "child", "triggerError"},
				},
			},
		},
		{
			Schema: graphql.MustParseSchema(`
				schema {
					query: Query
				}

				type Query {
					child: Child
				}

				type Child {
					noError: String!
					child: Child!
					nilChild: Child!
				}
			`, &childResolver{}),
			Query: `
				{
					child {
						child {
							nilChild {
								noError
							}
						}
					}
				}
			`,
			ExpectedResult: `
			{
				"child": null
			}
			`,
			ExpectedErrors: []*gqlerrors.QueryError{
				{
					Message: nilChildErrorString,
					Path:    []interface{}{"child", "child", "nilChild"},
				},
			},
		},
	})
}