91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package geo
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import (
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"math"
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"testing"
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)
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func TestCos(t *testing.T) {
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cosDelta := 1E-15
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tests := []struct {
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in float64
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want float64
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}{
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{math.NaN(), math.NaN()},
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{math.Inf(-1), math.NaN()},
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{math.Inf(1), math.NaN()},
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{1, math.Cos(1)},
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{0, math.Cos(0)},
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{math.Pi / 2, math.Cos(math.Pi / 2)},
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{-math.Pi / 2, math.Cos(-math.Pi / 2)},
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{math.Pi / 4, math.Cos(math.Pi / 4)},
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{-math.Pi / 4, math.Cos(-math.Pi / 4)},
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{math.Pi * 2 / 3, math.Cos(math.Pi * 2 / 3)},
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{-math.Pi * -2 / 3, math.Cos(-math.Pi * -2 / 3)},
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{math.Pi / 6, math.Cos(math.Pi / 6)},
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{-math.Pi / 6, math.Cos(-math.Pi / 6)},
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}
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for _, test := range tests {
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got := cos(test.in)
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if math.IsNaN(test.want) && !math.IsNaN(got) {
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t.Errorf("wanted NaN, got %f for cos(%f)", got, test.in)
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}
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if !math.IsNaN(test.want) && math.Abs(got-test.want) > cosDelta {
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t.Errorf("wanted: %f, got %f for cos(%f) diff %f", test.want, got, test.in, math.Abs(got-test.want))
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}
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}
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}
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func TestAsin(t *testing.T) {
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asinDelta := 1E-7
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tests := []struct {
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in float64
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want float64
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}{
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{math.NaN(), math.NaN()},
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{2, math.NaN()},
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{-2, math.NaN()},
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{-1, -math.Pi / 2},
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{-0.8660254, -math.Pi / 3},
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{-0.7071068, -math.Pi / 4},
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{-0.5, -math.Pi / 6},
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{0, 0},
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{0.5, math.Pi / 6},
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{0.7071068, math.Pi / 4},
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{0.8660254, math.Pi / 3},
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{1, math.Pi / 2},
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// these last two cases test the code outside tabular range
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{0.999999999999999, math.Pi / 2},
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{-0.999999999999999, -math.Pi / 2},
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}
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for _, test := range tests {
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got := asin(test.in)
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if math.IsNaN(test.want) && !math.IsNaN(got) {
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t.Errorf("wanted NaN, got %f for asin(%f)", got, test.in)
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}
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if !math.IsNaN(test.want) && math.Abs(got-test.want) > asinDelta {
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t.Errorf("wanted: %f, got %f for asin(%f) diff %.16f", test.want, got, test.in, math.Abs(got-test.want))
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}
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}
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}
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