| // Copyright ©2018 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 quat |
| |
| import ( |
| "math" |
| "testing" |
| ) |
| |
| var absTests = []struct { |
| q Number |
| want float64 |
| }{ |
| {q: Number{}, want: 0}, |
| {q: NaN(), want: nan}, |
| {q: Inf(), want: inf}, |
| {q: Number{Real: 1, Imag: 1, Jmag: 1, Kmag: 1}, want: 2}, |
| {q: Number{Real: -1, Imag: 1, Jmag: -1, Kmag: 1}, want: 2}, |
| {q: Number{Real: 1, Imag: 2, Jmag: 3, Kmag: 4}, want: math.Sqrt(1 + 4 + 9 + 16)}, |
| {q: Number{Real: -1, Imag: -2, Jmag: -3, Kmag: -4}, want: math.Sqrt(1 + 4 + 9 + 16)}, |
| } |
| |
| func TestAbs(t *testing.T) { |
| for _, test := range absTests { |
| got := Abs(test.q) |
| if math.IsNaN(test.want) { |
| if !math.IsNaN(got) { |
| t.Errorf("unexpected result for Abs(%v): got:%v want:%v", test.q, got, test.want) |
| } |
| continue |
| } |
| if got != test.want { |
| t.Errorf("unexpected result for Abs(%v): got:%v want:%v", test.q, got, test.want) |
| } |
| } |
| } |