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: stubs_test.go
    path of file: ./repos/gonum/internal/asm/f64
    
    the code of the file until where you have to start completion: // Copyright Â©2016 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 f64_test

import (
	"testing"

	"gonum.org/v1/gonum/floats/scalar"
	. "gonum.org/v1/gonum/internal/asm/f64"
)

func TestL1Norm(t *testing.T) {
	var src_gd float64 = 1
	for j, v := range []struct {
		want float64
		x    []float64
	}{
		{want: 0, x: []float64{}},
		{want: 2, x: []float64{2}},
		{want: 6, x: []float64{1, 2, 3}},
		{want: 6, x: []float64{-1, -2, -3}},
		{want: nan, x: []float64{nan}},
		{want: 40, x: []float64{8, -8, 8, -8, 8}},
		{want: 5, x: []float64{0, 1, 0, -1, 0, 1, 0, -1, 0, 1}},
	} {
		g_ln := 4 + j%2
		v.x = guardVector(v.x, src_gd, g_ln)
		src := v.x[g_ln : len(v.x)-g_ln]
		ret := L1Norm(src)
		if !scalar.Same(ret, v.want) {
			t.Errorf("Test %d L1Norm error Got: %f Expected: %f", j, ret, v.want)
		}
		if !isValidGuard(v.x, src_gd, g_ln) {
			t.Errorf("Test %d Guard violated in src vector %v %v", j, v.x[:g_ln], v.x[len(v.x)-g_ln:])
		}
	}
}

func TestL1NormInc(t *testing.T) {
	var src_gd float64 = 1
	for j, v := range []struct {
		inc  int
		want float64
		x    []float64
	}{

    
func TestSum(t *testing.T) {
	var srcGd float64 = -1
	for j, v := range []struct {
		src    []float64
		expect float64
	}{
		{
			src:    []float64{},
			expect: 0,
		},
		{
			src:    []float64{1},
			expect: 1,
		},
		{
			src:    []float64{nan},
			expect: nan,
		},
		{
			src:    []float64{1, 2, 3},
			expect: 6,
		},
		{
			src:    []float64{1, -4, 3},
			expect: 0,
		},
		{
			src:    []float64{1, 2, 3, 4},
			expect: 10,
		},
		{
			src:    []float64{1, 1, nan, 1, 1},
			expect: nan,
		},
		{
			src:    []float64{inf, 4, nan, -inf, 9},
			expect: nan,
		},
		{
			src:    []float64{1, 1, 1, 1, 9, 1, 1, 1, 2, 1, 1, 1, 1, 1, 5, 1},
			expect: 29,
		},
		{
			src:    []float64{1, 1, 1, 1, 9, 1, 1, 1, 2, 1, 1, 1, 1, 1, 5, 11, 1, 1, 1, 9, 1, 1, 1, 2, 1, 1, 1, 1, 1, 5, 1},
			expect: 67,
		},
	} {
		gdLn := 4 + j%2
		gsrc := guardVector(v.src, srcGd, gdLn)
		src := gsrc[gdLn : len(gsrc)-gdLn]
		ret := Sum(src)
		if !scalar.Same(ret, v.expect) {
			t.Errorf("Test %d Sum error Got: %v Expected: %v", j, ret, v.expect)
		}
		if !isValidGuard(gsrc, srcGd, gdLn) {
			t.Errorf("Test %d Guard violated in src vector %v %v", j, gsrc[:gdLn], gsrc[len(gsrc)-gdLn:])
		}

		gdLn++
		gsrc = guardVector(v.src, srcGd, gdLn)
		src = gsrc[gdLn : len(gsrc)-gdLn]
		ret = Sum(src)
		if !scalar.Same(ret, v.expect) {
			t.Errorf("Test %d Sum error Got: %v Expected: %v", j, ret, v.expect)
		}
		if !isValidGuard(gsrc, srcGd, gdLn) {
			t.Errorf("Test %d Guard violated in src vector %v %v", j, gsrc[:gdLn], gsrc[len(gsrc)-gdLn:])
		}
	}
}