/
dto_test.go
390 lines (334 loc) · 7.7 KB
/
dto_test.go
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package dto
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
// ==================================== Types for tests =======================
type Product struct {
Name string
Country string
Price float32
}
type ProductRef struct {
Product
Link string
}
type ShoppingCart struct {
Products []Product
}
type TaggedShoppingCart struct {
Products map[string][]Product
}
type RawPassword = string
type User struct {
Name string
Password RawPassword
}
type Order struct {
Id string
json.Marshaler `dto:"ignore"`
json.Unmarshaler `dto:"ignore"`
}
type OrderDto struct {
Id string
}
// ==================================== Data for tests ========================
var commonProducts = []Product{
{
Name: "Shirt",
Price: 9.4,
Country: "US",
},
{
Name: "Shoes",
Price: 17.3,
Country: "UK",
},
{
Name: "Hat",
Price: 19.7,
Country: "IT",
},
{
Name: "Bowtie",
Price: 5.1,
Country: "US",
},
}
var cartByCountries = TaggedShoppingCart{
Products: map[string][]Product{
"Europe": {commonProducts[1], commonProducts[2]},
"America": {commonProducts[0], commonProducts[3]},
},
}
// ==================================== Tests =================================
// Shallow structs with equal types
func TestSimple(t *testing.T) {
var outNameAndPrice struct {
Name string
Price float32
}
for _, product := range commonProducts {
err := Map(&outNameAndPrice, product)
assert.Nil(t, err)
assert.Equal(t, product.Name, outNameAndPrice.Name)
assert.Equal(t, product.Price, outNameAndPrice.Price)
}
}
// Struct with simple conversion (float to int)
func TestSimpleConv(t *testing.T) {
var outPriceInt struct {
Price int
}
for _, product := range commonProducts {
err := Map(&outPriceInt, product)
assert.Nil(t, err)
assert.Equal(t, int(product.Price), outPriceInt.Price)
}
}
// ProductRef embeds Product
func TestEmbedded(t *testing.T) {
var outNameAndLink struct {
Name string
Link string
}
for i, product := range commonProducts {
productRef := ProductRef{
Product: product,
Link: fmt.Sprintf("/p/%v", i),
}
Map(&outNameAndLink, productRef)
assert.Equal(t, productRef.Name, outNameAndLink.Name)
assert.Equal(t, productRef.Link, outNameAndLink.Link)
}
}
// Map a slice of Products
func TestSlice(t *testing.T) {
var outCart struct {
Products []struct {
Name string
}
}
testCart := ShoppingCart{
Products: commonProducts,
}
err := Map(&outCart, testCart)
assert.Nil(t, err)
assert.Equal(t, len(testCart.Products), len(outCart.Products))
for i, product := range outCart.Products {
assert.Equal(t, product.Name, testCart.Products[i].Name)
}
}
// Map a map of Product slices tagged by strings
func TestMap(t *testing.T) {
var outCart struct {
Products map[string][]struct {
Name string
}
}
testCart := cartByCountries
err := Map(&outCart, testCart)
assert.Nil(t, err)
assert.Equal(t, len(testCart.Products), len(outCart.Products))
for key, list := range outCart.Products {
testList, ok := testCart.Products[key]
assert.True(t, ok)
assert.Equal(t, len(testList), len(list))
for i, product := range list {
assert.Equal(t, testList[i].Name, product.Name)
}
}
}
// Map a map to a slice (its values)
func TestMapToSlice(t *testing.T) {
var outCart struct {
Products [][]struct {
Name string
}
}
testCart := cartByCountries
err := Map(&outCart, testCart)
assert.Nil(t, err)
assert.Equal(t, len(testCart.Products), len(outCart.Products))
}
// Map a map of slices to a slice (flatten)
func TestMapSlicesToSlice(t *testing.T) {
var outCart struct {
Products []struct {
Name string
}
}
testCart := cartByCountries
err := Map(&outCart, testCart)
assert.Nil(t, err)
tcLen := 0
for _, v := range testCart.Products {
tcLen += len(v)
}
assert.Equal(t, tcLen, len(outCart.Products))
}
// Dereference a pointer to map a struct
func TestPointerDeref(t *testing.T) {
var outCart struct {
Product struct {
Name string
}
}
var testCart struct {
Product *Product
}
testCart.Product = &commonProducts[0]
err := Map(&outCart, testCart)
assert.Nil(t, err)
assert.Equal(t, testCart.Product.Name, outCart.Product.Name)
}
// Conversion functions without errors and with mapper injection
func TestConversionFunc(t *testing.T) {
type PasswordLen = int
var outUser struct {
Password PasswordLen
}
testUser := User{
Name: "Bob",
Password: "Secret",
}
m := Mapper{}
m.AddConvFunc(func(p RawPassword, im *Mapper) PasswordLen {
assert.Equal(t, &m, im)
return len(p)
})
err := m.Map(&outUser, testUser)
assert.Nil(t, err)
assert.Equal(t, len(testUser.Password), outUser.Password)
}
// Inspect functions without errors and with mapper injection that change data
func TestInspectFunc(t *testing.T) {
type ProductDTO struct {
Name string
Expensive bool
}
var outCart struct {
Products []ProductDTO
}
testCart := ShoppingCart{
Products: commonProducts,
}
m := Mapper{}
m.AddInspectFunc(func(dto *ProductDTO, prod Product, im *Mapper) {
assert.Equal(t, &m, im)
assert.Equal(t, prod.Name, dto.Name)
dto.Expensive = prod.Price > 10
})
err := m.Map(&outCart, testCart)
assert.Nil(t, err)
assert.Equal(t, len(testCart.Products), len(outCart.Products))
for i, product := range outCart.Products {
assert.Equal(t, testCart.Products[i].Price > 10, product.Expensive)
}
}
func TestErrorNoValidMapping(t *testing.T) {
var outProduct struct {
Name int
}
err := Map(&outProduct, commonProducts[0])
assert.ErrorIs(t, err, NoValidMappingError{
ToType: reflect.TypeOf(int(0)),
FromType: reflect.TypeOf(string("")),
})
}
// Propagate error from inspection function
func TestErrorPropagation(t *testing.T) {
var outCart struct {
Products []struct {
Name string
}
}
testCart := ShoppingCart{
Products: commonProducts,
}
var testError = errors.New("Test error")
m := Mapper{}
m.AddInspectFunc(func(name *string) error {
return testError
})
err := m.Map(&outCart, testCart)
assert.Equal(t, testError, err)
}
func TestPointerCases(t *testing.T) {
{
var fromProduct = struct {
Prod *Product
}{Prod: nil}
var outProduct struct {
Prod Product
}
Map(&outProduct, fromProduct)
assert.Zero(t, outProduct.Prod)
}
{
var fromProduct = struct {
Prod Product
}{Prod: commonProducts[0]}
var outProduct struct {
Prod *Product
}
Map(&outProduct, fromProduct)
assert.NotNil(t, outProduct.Prod)
assert.Equal(t, commonProducts[0], *outProduct.Prod)
}
{
type SubProduct struct {
Name string
}
var fromProduct = struct {
Prod *Product
}{Prod: &commonProducts[0]}
var outProduct struct {
Prod *SubProduct
}
Map(&outProduct, fromProduct)
assert.Equal(t, commonProducts[0].Name, outProduct.Prod.Name)
}
}
func TestStructureTagIgnoreCase(t *testing.T) {
order := Order{Id: "test"}
var outOrder OrderDto
Map(&outOrder, order)
assert.Equal(t, order.Id, outOrder.Id)
}
// ==================================== Benchmarks ============================
type benchCart = struct {
Products []struct {
Name string
}
}
func benchMakeTestCart(size int) ShoppingCart {
out := ShoppingCart{
Products: make([]Product, size),
}
for i := 0; i < size; i++ {
out.Products[i] = commonProducts[i%len(commonProducts)]
}
return out
}
// Benchmark without godto
func BenchmarkSimpleMap(b *testing.B) {
var outCart benchCart
testCart := benchMakeTestCart(1000)
b.ResetTimer()
outCart.Products = make([]struct{ Name string }, len(testCart.Products))
for i, prod := range testCart.Products {
outCart.Products[i].Name = prod.Name
}
}
// Benchmark with godto
func BenchmarkDtoMap(b *testing.B) {
var outCart benchCart
testCart := benchMakeTestCart(1000)
b.ResetTimer()
Map(&outCart, testCart)
}