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: dlapll.go
    path of file: ./repos/gonum/lapack/testlapack
    
    the code of the file until where you have to start completion: // Copyright ©2017 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package testlapack

import (
	"testing"

	"golang.org/x/exp/rand"

	"gonum.org/v1/gonum/floats/scalar"
	"gonum.org/v1/gonum/lapack"
)

type Dlapller interface {
	Dgesvder
	Dlapll(n int, x []float64, incX int, y []float64, incY int) float64
}

func DlapllTest(t *testing.T, impl Dlapller) {
	rnd := rand.New(rand.NewSource(1))
	
    
func DlapllTest(t *testing.T, impl Dlapller) {
	rnd := rand.New(rand.NewSource(1))
	for i, m := range []int{5, 6, 9, 300, 400, 600} {
		n := 2
		lda := n
		// Allocate m×2 matrix A and fill it with random numbers.
		a := make([]float64, m*lda)
		for i := range a {
			a[i] = rnd.NormFloat64()
		}
		// Store a copy of A for later comparison.
		aCopy := make([]float64, len(a))
		copy(aCopy, a)

		// Compute the smallest singular value of A.
		got := impl.Dlapll(m, a[0:], lda, a[1:], lda)

		// Compute singular values of A independently by Dgesvd.
		s := make([]float64, min(m, n))
		work := make([]float64, 1)
		impl.Dgesvd(lapack.SVDNone, lapack.SVDNone, m, n, aCopy, lda, s, nil, 1, nil, 1, work, -1)
		work = make([]float64, int(work[0]))
		impl.Dgesvd(lapack.SVDNone, lapack.SVDNone, m, n, aCopy, lda, s, nil, 1, nil, 1, work, len(work))
		// Take the smallest singular value.
		want := s[len(s)-1]

		if !scalar.EqualWithinAbsOrRel(got, want, 1e-14, 1e-14) {
			t.Errorf("Case %d: unexpected smallest singular value, got:%f want:%f", i, got, want)
		}
	}
}