json2go/json2go_test.go(view raw)
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package json2go
import (
"errors"
"fmt"
"reflect"
"strings"
"testing"
)
func field(name, type_ string, json_ ...string) string {
if strings.Contains(type_, "struct") {
return fmt.Sprintf("\n%s %s", name, type_)
}
tag := strings.ToLower(name)
if len(json_) == 1 {
tag = json_[0]
}
return fmt.Sprintf("\n%s %s `json:\"%s\"`", name, type_, tag)
}
func TestTransformer_Transform(t *testing.T) {
tests := map[string]struct {
input string
output string
structName string
err error
}{
"simple object": {
input: `{"name": "Olex", "active": true, "age": 420}`,
output: "type Out struct {" +
field("Active", "bool") +
field("Age", "int") +
field("Name", "string") +
"\n}",
},
"invalid json": {
err: ErrInvalidJSON,
input: `{"invalid":json}`,
},
"invalid struct name, starts with number": {
err: ErrInvalidStructName,
structName: "1Name",
},
"invalid struct name, has space": {
err: ErrInvalidStructName,
structName: "Name Name2",
},
"invalid struct name, has non letter/number": {
err: ErrInvalidStructName,
structName: "Name$",
},
"snake_case to CamelCase": {
input: `{"first_name": "Bob", "last_name": "Bobberson"}`,
output: "type Out struct {" +
field("FirstName", "string", "first_name") +
field("LastName", "string", "last_name") +
"\n}",
},
"nested object and array": {
input: `{"user": {"name": "Alice", "score": 95.5}, "tags": ["go", "json"]}`,
output: "type Out struct {" +
field("Tags", "[]string") +
field("User", "struct {") +
field("Name", "string") +
field("Score", "float64") +
"\n} `json:\"user\"`" +
"\n}",
},
"empty nested object": {
input: `{"user": {}}`,
output: "type Out struct {" +
field("User", "struct {") +
"\n} `json:\"user\"`" +
"\n}",
},
"array of object": {
input: `[{"name": "John"}, {"name": "Jane"}]`,
output: "type Out []struct {" +
field("Name", "string") +
"\n}",
},
"empty array": {
input: `{"items": []}`,
output: "type Out struct {" +
field("Items", "[]any") +
"\n}",
},
"null": {
input: `{"item": null}`,
output: `type Out struct {` +
field("Item", "any") +
"\n}",
},
"numbers": {
input: `{"pos": 123, "neg": -321, "float": 420.69}`,
output: "type Out struct {" +
field("Float", "float64") +
field("Neg", "int") +
field("Pos", "int") +
"\n}",
},
}
trans := NewTransformer()
for tname, tt := range tests {
t.Run(tname, func(t *testing.T) {
sn := "Out"
if tt.structName != "" {
sn = tt.structName
}
result, err := trans.Transform(sn, tt.input)
assertEqualErr(t, tt.err, err)
assertEqual(t, tt.output, result)
})
}
}
func assertEqualErr(t *testing.T, expected, actual error) {
t.Helper()
if expected == nil && actual == nil {
return
}
if expected == nil || actual == nil {
t.Errorf("expected: %v, got: %v", expected, actual)
return
}
if !errors.Is(actual, expected) {
t.Errorf("expected error: %v, got: %v", expected, actual)
}
}
func assertEqual[T any](t *testing.T, expected, actual T) {
t.Helper()
if !reflect.DeepEqual(expected, actual) {
t.Errorf("expected: %v, got: %v\n", expected, actual)
}
}
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