package main_test

import (
	"fmt"
	"os"
	"testing"

	"github.com/google/go-cmp/cmp"
)

func TestMain(t *testing.T) {
	expected := `// Code generated by protoc-gen-go-value-scan. DO NOT EDIT.

package foov1

import (
	"database/sql/driver"
	"fmt"

	protojson "google.golang.org/protobuf/encoding/protojson"
)

func (x Foo) Value() (driver.Value, error) {
	f := &x

	opts := protojson.MarshalOptions{}
	opts.UseProtoNames = false
	opts.EmitUnpopulated = true

	return opts.Marshal(f)
}

func (x *Foo) Scan(value interface{}) error {
	switch v := value.(type) {
	case []byte:
		return protojson.Unmarshal(v, x)
	case string:
		return protojson.Unmarshal([]byte(v), x)
	default:
		return fmt.Errorf("type assertion failed")
	}
}
`

	// Read generated file.
	f, err := os.ReadFile("go/foo/v1/foo.value_scan.pb.go")
	if err != nil {
		t.Errorf("could not read generated file: %s", err.Error())
		t.FailNow()
	}

	// Compare.
	// require.Equal(expected, string(f))
	if diff := cmp.Diff(expected, string(f)); diff != "" {
		t.Errorf(
			fmt.Sprintf(
				"Not equal:\n Delta: %s\n",
				diff,
			),
		)
		t.FailNow()
	}
}