You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: user_ek_test.go
    path of file: ./repos/client/go/ephemeral
    
    the code of the file until where you have to start completion: package ephemeral

import (
	"testing"

	"github.com/keybase/client/go/engine"
	"github.com/keybase/client
    
func TestPukRollNewUserEK(t *testing.T) {
	tc, mctx, user := ephemeralKeyTestSetup(t)
	defer tc.Cleanup()

	// Confirm that the user has a userEK.
	uid := tc.G.Env.GetUID()
	uids := []keybase1.UID{uid}
	statements, err := fetchUserEKStatements(mctx, uids)
	require.NoError(t, err)
	firstStatement, ok := statements[uid]
	require.True(t, ok)
	require.EqualValues(t, firstStatement.CurrentUserEkMetadata.Generation, 1, "should start at userEK gen 1")

	// Do a PUK roll.
	rollEngine := engine.NewPerUserKeyRoll(tc.G, &engine.PerUserKeyRollArgs{})
	uis := libkb.UIs{
		LogUI:    tc.G.UI.GetLogUI(),
		SecretUI: user.NewSecretUI(),
	}
	mctx = mctx.WithUIs(uis)
	err = engine.RunEngine2(mctx, rollEngine)
	require.NoError(t, err)

	// Finally, confirm that the roll above also rolled a new userEK.
	statements, err = fetchUserEKStatements(mctx, uids)
	require.NoError(t, err)
	secondStatement, ok := statements[uid]
	require.True(t, ok)
	require.EqualValues(t, secondStatement.CurrentUserEkMetadata.Generation, 2, "after PUK roll, should have userEK gen 2")
	userEK, err := tc.G.GetUserEKBoxStorage().Get(mctx, 2, nil)
	require.NoError(t, err)
	require.Equal(t, secondStatement.CurrentUserEkMetadata, userEK.Metadata)

	// Confirm that we can make a new userEK after rolling the PUK
	merkleRootPtr, err := tc.G.GetMerkleClient().FetchRootFromServer(mctx, libkb.EphemeralKeyMerkleFreshness)
	require.NoError(t, err)
	merkleRoot := *merkleRootPtr
	publishAndVerifyUserEK(mctx, t, merkleRoot, uid)
}