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|
package dynamizer
import (
"bytes"
"encoding/json"
"math"
"reflect"
"testing"
)
type mySimpleStruct struct {
String string `json:"string"`
Int int
Uint uint `json:"uint"`
Float32 float32
Float64 float64
Bool bool
Null *interface{}
}
type myComplexStruct struct {
Simple []mySimpleStruct
}
type dynamizerTestInput struct {
input interface{}
expected string
}
var dynamizerTestInputs = []dynamizerTestInput{
// Scalar tests
dynamizerTestInput{
input: map[string]interface{}{"string": "some string"},
expected: `{"string":{"S":"some string"}}`},
dynamizerTestInput{
input: map[string]interface{}{"bool": true},
expected: `{"bool":{"BOOL":true}}`},
dynamizerTestInput{
input: map[string]interface{}{"bool": false},
expected: `{"bool":{"BOOL":false}}`},
dynamizerTestInput{
input: map[string]interface{}{"null": nil},
expected: `{"null":{"NULL":true}}`},
dynamizerTestInput{
input: map[string]interface{}{"float": 3.14},
expected: `{"float":{"N":"3.14"}}`},
dynamizerTestInput{
input: map[string]interface{}{"float": math.MaxFloat32},
expected: `{"float":{"N":"340282346638528860000000000000000000000"}}`},
dynamizerTestInput{
input: map[string]interface{}{"float": math.MaxFloat64},
expected: `{"float":{"N":"179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}}`},
dynamizerTestInput{
input: map[string]interface{}{"int": int(12)},
expected: `{"int":{"N":"12"}}`},
// List
dynamizerTestInput{
input: map[string]interface{}{"list": []interface{}{"a string", 12, 3.14, true, nil, false}},
expected: `{"list":{"L":[{"S":"a string"},{"N":"12"},{"N":"3.14"},{"BOOL":true},{"NULL":true},{"BOOL":false}]}}`},
// Map
dynamizerTestInput{
input: map[string]interface{}{"map": map[string]interface{}{"nestedint": 12}},
expected: `{"map":{"M":{"nestedint":{"N":"12"}}}}`},
dynamizerTestInput{
input: &map[string]interface{}{"map": map[string]interface{}{"nestedint": 12}},
expected: `{"map":{"M":{"nestedint":{"N":"12"}}}}`},
// Structs
dynamizerTestInput{
input: mySimpleStruct{},
expected: `{"Bool":{"BOOL":false},"Float32":{"N":"0"},"Float64":{"N":"0"},"Int":{"N":"0"},"Null":{"NULL":true},"string":{"S":""},"uint":{"N":"0"}}`},
dynamizerTestInput{
input: &mySimpleStruct{},
expected: `{"Bool":{"BOOL":false},"Float32":{"N":"0"},"Float64":{"N":"0"},"Int":{"N":"0"},"Null":{"NULL":true},"string":{"S":""},"uint":{"N":"0"}}`},
dynamizerTestInput{
input: myComplexStruct{},
expected: `{"Simple":{"NULL":true}}`},
dynamizerTestInput{
input: myComplexStruct{Simple: []mySimpleStruct{mySimpleStruct{}, mySimpleStruct{}}},
expected: `{"Simple":{"L":[{"M":{"Bool":{"BOOL":false},"Float32":{"N":"0"},"Float64":{"N":"0"},"Int":{"N":"0"},"Null":{"NULL":true},"string":{"S":""},"uint":{"N":"0"}}},{"M":{"Bool":{"BOOL":false},"Float32":{"N":"0"},"Float64":{"N":"0"},"Int":{"N":"0"},"Null":{"NULL":true},"string":{"S":""},"uint":{"N":"0"}}}]}}`},
}
func TestToDynamo(t *testing.T) {
for _, test := range dynamizerTestInputs {
testToDynamo(t, test.input, test.expected)
}
}
func testToDynamo(t *testing.T, in interface{}, expectedString string) {
var expected interface{}
var buf bytes.Buffer
buf.WriteString(expectedString)
if err := json.Unmarshal(buf.Bytes(), &expected); err != nil {
t.Fatal(err)
}
actual, err := ToDynamo(in)
if err != nil {
t.Fatal(err)
}
compareObjects(t, expected, actual)
}
func TestFromDynamo(t *testing.T) {
// Using the same inputs from TestToDynamo, test the reverse mapping.
for _, test := range dynamizerTestInputs {
testFromDynamo(t, test.expected, test.input)
}
}
func testFromDynamo(t *testing.T, inputString string, expected interface{}) {
var item DynamoItem
var buf bytes.Buffer
buf.WriteString(inputString)
if err := json.Unmarshal(buf.Bytes(), &item); err != nil {
t.Fatal(err)
}
var actual map[string]interface{}
if err := FromDynamo(item, &actual); err != nil {
t.Fatal(err)
}
compareObjects(t, expected, actual)
}
// TestStruct tests that we get a typed struct back
func TestStruct(t *testing.T) {
expected := mySimpleStruct{String: "this is a string", Int: 1000000, Uint: 18446744073709551615, Float64: 3.14}
dynamized, err := ToDynamo(expected)
if err != nil {
t.Fatal(err)
}
var actual mySimpleStruct
err = FromDynamo(dynamized, &actual)
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(expected, actual) {
t.Fatalf("Did not get back the expected typed struct")
}
}
// TestStructSlice tests that we get typed structs back while operating on an
// array of slices.
func TestStructSlice(t *testing.T) {
expected := mySimpleStruct{String: "this is a string", Int: 1000000, Uint: 18446744073709551615, Float64: 3.14}
dynamized, err := ToDynamo(expected)
if err != nil {
t.Fatal(err)
}
actual := make([]mySimpleStruct, 1)
rv := reflect.ValueOf(actual)
err = FromDynamo(dynamized, rv.Index(0))
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(expected, actual[0]) {
t.Fatalf("Did not get back the expected typed struct")
}
}
func TestBadInput(t *testing.T) {
var dynamized DynamoItem
var out interface{}
err := FromDynamo(dynamized, out)
if err == nil {
t.Fatal("Expected error")
}
if err.Error() != "v must be a non-nil pointer to a map[string]interface{} or struct (or an addressable reflect.Value), got zero-value" {
t.Fatalf("Expected `v must be a non-nil pointer to a map[string]interface{} or struct (or an addressable reflect.Value), got zero-value`, got `%s`", err.Error())
}
var out2 map[string]interface{}
err = FromDynamo(dynamized, out2)
if err == nil {
t.Fatal("Expected error")
}
if err.Error() != "v must be a non-nil pointer to a map[string]interface{} or struct (or an addressable reflect.Value), got map[string]interface {}" {
t.Fatalf("Expected `v must be a non-nil pointer to a map[string]interface{} or struct (or an addressable reflect.Value), got map[string]interface {}`, got `%s`", err.Error())
}
var out3 mySimpleStruct
rv := reflect.ValueOf(&out3)
err = FromDynamo(dynamized, rv)
if err == nil {
t.Fatal("Expected error")
}
if err.Error() != "v is not addressable" {
t.Fatalf("Expected `v is not addressable`, got `%s`", err.Error())
}
}
// What we're trying to do here is compare the JSON encoded values, but we can't
// to a simple encode + string compare since JSON encoding is not ordered. So
// what we do is JSON encode, then JSON decode into untyped maps, and then
// finally do a recursive comparison.
func compareObjects(t *testing.T, expected interface{}, actual interface{}) {
expectedBytes, err := json.Marshal(expected)
if err != nil {
t.Fatal(err)
return
}
actualBytes, err := json.Marshal(actual)
if err != nil {
t.Fatal(err)
return
}
var expectedUntyped, actualUntyped map[string]interface{}
err = json.Unmarshal(expectedBytes, &expectedUntyped)
if err != nil {
t.Fatal(err)
return
}
err = json.Unmarshal(actualBytes, &actualUntyped)
if err != nil {
t.Fatal(err)
return
}
if !reflect.DeepEqual(expectedUntyped, actualUntyped) {
t.Fatalf("Expected %s, got %s", string(expectedBytes), string(actualBytes))
}
}
|
