Test code to reproduce a mercari/datastore's bug

client_test.go

package aedatastore

import (
	"testing"
	"time"

	"google.golang.org/appengine"
	"google.golang.org/appengine/aetest"
)

func TestAEDatastore_DataTypes(t *testing.T) {

	inst, err := aetest.NewInstance(&aetest.Options{StronglyConsistentDatastore: true})
	if err != nil {
		t.Fatal(err)
	}
	defer inst.Close()
	r, err := inst.NewRequest("GET", "/", nil)
	if err != nil {
		t.Fatal(err)
	}
	ctx := appengine.NewContext(r)

	type Location struct {
		Lat float64 `json:"lat"`
		Lng float64 `json:"lng"`
	}

	type LocalAccessID struct {
		UserID int64 `datastore:"UserId"`
		Location
	}
	type LocalAccess struct {
		LocalAccessID
		PreciseLocation Location  `datastore:"PreciseLocation"`
		Count           int64     `datastore:"Count"`
		UpdatedTime     time.Time `datastore:"UpdatedTime"`
		CreatedTime     time.Time `datastore:"CreatedTime"`
	}

	client, err := FromContext(ctx)
	if err != nil {
		t.Fatal(err)
	}

	dat := &LocalAccess{
		LocalAccessID: LocalAccessID{
			UserID:   1,
			Location: Location{10.78, 20.35},
		},
		PreciseLocation: Location{10.78, 20.35},
		UpdatedTime:     time.Now(),
		CreatedTime:     time.Now(),
	}

	key := client.NameKey("LocalAccess", "1-10.78-20.35", nil)
	_, err = client.Put(ctx, key, &dat)
	if err != nil {
		t.Errorf("want nil; got %s", err)
	}
}

pre_client_test.go

package aedatastore

import (
	"testing"

	"google.golang.org/appengine/aetest"
	"google.golang.org/appengine"
)

func TestAEDatastore_DataTypes(t *testing.T) {

	inst, err := aetest.NewInstance(&aetest.Options{StronglyConsistentDatastore: true})
	if err != nil {
		t.Fatal(err)
	}
	defer inst.Close()
	r, err := inst.NewRequest("GET", "/", nil)
	if err != nil {
		t.Fatal(err)
	}
	ctx := appengine.NewContext(r)

	type Cheese struct {}
	type Contains struct {
		Cheese Cheese
		ExtraCheese *Cheese
	}
	type Burger struct {
		Contains
	}

	client, err := FromContext(ctx)
	if err != nil {
		t.Fatal(err)
	}

	burger := Burger{
		Contains{
			Cheese:      Cheese{},
			ExtraCheese: &Cheese{},
		},
	}
	key := client.NameKey("DomDom","a", nil)
	_, err = client.Put(ctx, key, &burger)
	if err != nil {
		t.Errorf("want nil; got %s", err)
	}
}