ctxtime provides testable time.Now.

By default, ctxtime.Now(ctx) returns the current time in UTC. ctxtimetest.SetFixedNow' can be used to set the return value of ctxtime.Now(ctx). The return value will be assocciated the test id that can be obtained from the context. However, if testing.Testing returns false, ctxtimetest.SetFixedNow won't affect ctxtime.Now.

package a_test

import (
	"context"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/newmo-oss/ctxtime"
	"github.com/newmo-oss/ctxtime/ctxtimetest"
	"github.com/newmo-oss/testid"
)

func Test(t *testing.T) {
	tid := uuid.NewString()
	ctx := testid.WithValue(context.Background(), tid)
	now := ctxtime.Now(ctx)
	ctxtimetest.SetFixedNow(t, ctx, now)
	time.Sleep(10 * time.Second)
	now2 := ctxtime.Now(ctx)
	t.Log(now == now2) // true
}

ctxtimecheck is a linter that finds calls of time.Now in your code.

You can install ctxtimecheck by go install.

$ go install github.com/newmo-oss/ctxtime/ctxtimecheck/cmd/ctxtimecheck@latest

ctxtimecheck can be run with the go vet command.

$ go vet -vettool=$(which ctxtimecheck) ./...

If you are already using gostaticanalysis/called, it can be used instead of ctxtimecheck as follows.

$ go vet -vettool=$(which called) -called.funcs="time.Now" ./...

MIT