// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: MIT

package signal

import (
	"testing"

	"sourcedock.dev/petrbalvin/tensor/internal/core"
)

// TestFloat32FFT checks that the transform computes in float64 from
// float32 inputs.
func TestFloat32FFT(t *testing.T) {
	a, err := core.FromFloat32s([]float32{1, 1, 1, 1}, 4)
	if err != nil {
		t.Fatal(err)
	}
	spec, err := FFT(a)
	if err != nil {
		t.Fatalf("FFT float32: %v", err)
	}
	if v := spec.ComplexAt(0); v != 4 {
		t.Fatalf("FFT DC: %v", v)
	}
}