How to delete quad in dgraph using dgo api.NQuad

Is it possible to remove all edges matching a predicate from a given node using api.NQuad from github.com/dgraph-io/dgo/protos/api?

I'm trying to achieve the equivalent of delete {0x1234 <test.likes> * }

func TestDeleteQuad(t *testing.T) {
    subject := "0x01"
    ctx := context.TODO()
    d, err := grpc.Dial(testEndpoint, grpc.WithInsecure())
    if err != nil {
        panic(err)
    }
    client := dgo.NewDgraphClient(api.NewDgraphClient(d))
    txn := client.NewTxn()
    defer txn.Discard(ctx)
    if _, err := txn.Mutate(ctx, &api.Mutation{Del: []*api.NQuad{
        &api.NQuad{
            Subject:     subject,
            Predicate:   "test.likes",
            ObjectId:    "*",
            ObjectValue: nil,
        },
    }}); nil != err {
        panic(err)
    }
    err = txn.Commit(ctx)
    assert.NoError(t, err)
}

I tried using "*" "" x.Star as ObjectId but none of those solutions work

This is quite counter intuitive, but to delete edges, ObjectValue must be used instead of ObjectId has to be set to api.Value_DefaultVal star:

func TestDeleteQuad(t *testing.T) {
    subject := "0x01"
    ctx := context.TODO()
    d, err := grpc.Dial(testEndpoint, grpc.WithInsecure())
    if err != nil {
        panic(err)
    }
    client := dgo.NewDgraphClient(api.NewDgraphClient(d))
    txn := client.NewTxn()
    defer txn.Discard(ctx)
    if _, err := txn.Mutate(ctx, &api.Mutation{Del: []*api.NQuad{
        &api.NQuad{
            Subject:     subject,
            Predicate:   "test.likes",
            ObjectValue: &api.Value{&api.Value_DefaultVal{x.Star}}, // <- this
        },
    }}); nil != err {
        panic(err)
    }
    err = txn.Commit(ctx)
    assert.NoError(t, err)
}