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interfaces_test.go
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interfaces_test.go
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package followschema
import (
"context"
"fmt"
"reflect"
"testing"
"github.com/99designs/gqlgen/client"
"github.com/99designs/gqlgen/graphql"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/stretchr/testify/require"
)
func TestInterfaces(t *testing.T) {
t.Run("slices of interfaces are not pointers", func(t *testing.T) {
field, ok := reflect.TypeOf((*QueryResolver)(nil)).Elem().MethodByName("Shapes")
require.True(t, ok)
require.Equal(t, "[]followschema.Shape", field.Type.Out(0).String())
})
t.Run("models returning interfaces", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.Node = func(ctx context.Context) (node Node, err error) {
return &ConcreteNodeA{
ID: "1234",
Name: "asdf",
child: &ConcreteNodeA{
ID: "5678",
Name: "hjkl",
child: nil,
},
}, nil
}
srv := handler.NewDefaultServer(
NewExecutableSchema(Config{
Resolvers: resolvers,
}),
)
c := client.New(srv)
var resp struct {
Node struct {
ID string
Child struct {
ID string
}
}
}
c.MustPost(`{ node { id, child { id } } }`, &resp)
require.Equal(t, "1234", resp.Node.ID)
require.Equal(t, "5678", resp.Node.Child.ID)
})
t.Run("interfaces can be nil", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.NoShape = func(ctx context.Context) (shapes Shape, e error) {
return nil, nil
}
srv := handler.NewDefaultServer(
NewExecutableSchema(Config{
Resolvers: resolvers,
Directives: DirectiveRoot{
MakeNil: func(ctx context.Context, obj interface{}, next graphql.Resolver) (res interface{}, err error) {
return nil, nil
},
},
}),
)
c := client.New(srv)
var resp interface{}
c.MustPost(`{ noShape { area } }`, &resp)
})
t.Run("interfaces can be typed nil", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.NoShapeTypedNil = func(ctx context.Context) (shapes Shape, e error) {
panic("should not be called")
}
srv := handler.NewDefaultServer(
NewExecutableSchema(Config{
Resolvers: resolvers,
Directives: DirectiveRoot{
MakeTypedNil: func(ctx context.Context, obj interface{}, next graphql.Resolver) (res interface{}, err error) {
var circle *Circle
return circle, nil
},
},
}),
)
c := client.New(srv)
var resp interface{}
c.MustPost(`{ noShapeTypedNil { area } }`, &resp)
})
t.Run("interfaces can be nil (test with code-generated resolver)", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.Animal = func(ctx context.Context) (animal Animal, e error) {
panic("should not be called")
}
srv := handler.NewDefaultServer(
NewExecutableSchema(Config{
Resolvers: resolvers,
Directives: DirectiveRoot{
MakeTypedNil: func(ctx context.Context, obj interface{}, next graphql.Resolver) (res interface{}, err error) {
var dog *Dog // return a typed nil, not just nil
return dog, nil
},
},
}),
)
c := client.New(srv)
var resp interface{}
c.MustPost(`{ animal { species } }`, &resp)
})
t.Run("can bind to interfaces even when the graphql is not", func(t *testing.T) {
resolvers := &Stub{}
resolvers.BackedByInterfaceResolver.ID = func(ctx context.Context, obj BackedByInterface) (s string, err error) {
return "ID:" + obj.ThisShouldBind(), nil
}
resolvers.QueryResolver.NotAnInterface = func(ctx context.Context) (byInterface BackedByInterface, err error) {
return &BackedByInterfaceImpl{
Value: "A",
Error: nil,
}, nil
}
c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
var resp struct {
NotAnInterface struct {
ID string
ThisShouldBind string
ThisShouldBindWithError string
}
}
c.MustPost(`{ notAnInterface { id, thisShouldBind, thisShouldBindWithError } }`, &resp)
require.Equal(t, "ID:A", resp.NotAnInterface.ID)
require.Equal(t, "A", resp.NotAnInterface.ThisShouldBind)
require.Equal(t, "A", resp.NotAnInterface.ThisShouldBindWithError)
})
t.Run("can return errors from interface funcs", func(t *testing.T) {
resolvers := &Stub{}
resolvers.BackedByInterfaceResolver.ID = func(ctx context.Context, obj BackedByInterface) (s string, err error) {
return "ID:" + obj.ThisShouldBind(), nil
}
resolvers.QueryResolver.NotAnInterface = func(ctx context.Context) (byInterface BackedByInterface, err error) {
return &BackedByInterfaceImpl{
Value: "A",
Error: fmt.Errorf("boom"),
}, nil
}
c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
var resp struct {
NotAnInterface struct {
ID string
ThisShouldBind string
ThisShouldBindWithError string
}
}
err := c.Post(`{ notAnInterface { id, thisShouldBind, thisShouldBindWithError } }`, &resp)
require.EqualError(t, err, `[{"message":"boom","path":["notAnInterface","thisShouldBindWithError"]}]`)
})
t.Run("interfaces can implement other interfaces", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.Node = func(ctx context.Context) (node Node, err error) {
return ConcreteNodeInterfaceImplementor{}, nil
}
c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
var resp struct {
Node struct {
ID string
Child struct {
ID string
}
}
}
c.MustPost(`{ node { id, child { id } } }`, &resp)
require.Equal(t, "CNII", resp.Node.ID)
require.Equal(t, "Child", resp.Node.Child.ID)
})
t.Run("interface implementors should return merged base fields", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.Shapes = func(ctx context.Context) (shapes []Shape, err error) {
return []Shape{
&Rectangle{
Coordinates: Coordinates{
X: -1,
Y: -1,
},
},
&Circle{
Coordinates: Coordinates{
X: 1,
Y: 1,
},
},
}, nil
}
c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
var resp struct {
Shapes []struct {
Coordinates struct {
X float64
Y float64
}
}
}
c.MustPost(`
{
shapes {
coordinates {
x
}
... on Rectangle {
coordinates {
x
}
}
... on Circle {
coordinates {
y
}
}
}
}
`, &resp)
require.Equal(t, 2, len(resp.Shapes))
require.Equal(t, float64(-1), resp.Shapes[0].Coordinates.X)
require.Equal(t, float64(0), resp.Shapes[0].Coordinates.Y)
require.Equal(t, float64(1), resp.Shapes[1].Coordinates.X)
require.Equal(t, float64(1), resp.Shapes[1].Coordinates.Y)
})
t.Run("fragment on interface must return merged fields", func(t *testing.T) {
resolvers := &Stub{}
resolvers.QueryResolver.Dog = func(ctx context.Context) (dog *Dog, err error) {
return &Dog{
Size: &Size{
Height: 100,
Weight: 35,
},
}, nil
}
c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
var resp struct {
Dog struct {
Size struct {
Height int
Weight int
}
}
}
c.MustPost(`
{
dog {
size {
height
}
...AnimalWeight
}
}
fragment AnimalWeight on Animal {
size {
weight
}
}
`, &resp)
require.Equal(t, 100, resp.Dog.Size.Height)
require.Equal(t, 35, resp.Dog.Size.Weight)
})
}