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// 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 testblas
import (
"testing"
"golang.org/x/exp/rand"
"gonum.org/v1/gonum/floats/scalar"
)
type Dzasumer interface {
Dzasum(n int, x []complex128, incX int) float64
}
func DzasumTest(t *testing.T, impl Dzasumer) {
const tol = 1e-14
rnd := rand.New(rand.NewSource(1))
for _, n := range []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 50, 100} {
for _, incX := range []int{-5, 1, 2, 10} {
aincX := abs(incX)
var x []complex128
if n > 0 {
x = make([]complex128, (n-1)*aincX+1)
}
for i := range x {
x[i] = znan
}
for i := 0; i < n; i++ {
re := float64(2*i + 1)
if rnd.Intn(2) == 0 {
re *= -1
}
im := float64(2 * (i + 1))
if rnd.Intn(2) == 0 {
im *= -1
}
x[i*aincX] = complex(re, im)
}
want := float64(n * (2*n + 1))
got := impl.Dzasum(n, x, incX)
if incX < 0 {
if got != 0 {
t.Errorf("Case n=%v,incX=%v: non-zero result when incX < 0. got %v", n, incX, got)
}
continue
}
if !scalar.EqualWithinAbsOrRel(got, want, tol, tol) {
t.Errorf("Case n=%v,incX=%v: unexpected result. want %v, got %v", n, incX, want, got)
}
}
}
}
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