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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package rpn
import (
"math"
"strings"
"testing"
)
func TestFastPower(t *testing.T) {
tests := []struct {
name string
prepare func(*Stack)
wantErr bool
wantErrSub string
want float64
}{
{
name: "2 ** 10 = 1024",
prepare: func(s *Stack) { s.Push(NewNumber(2.0, FloatMode)); s.Push(NewNumber(10.0, FloatMode)) },
want: 1024.0,
},
{
name: "3 ** 4 = 81",
prepare: func(s *Stack) { s.Push(NewNumber(3.0, FloatMode)); s.Push(NewNumber(4.0, FloatMode)) },
want: 81.0,
},
{
name: "5 ** 0 = 1",
prepare: func(s *Stack) { s.Push(NewNumber(5.0, FloatMode)); s.Push(NewNumber(0.0, FloatMode)) },
want: 1.0,
},
{
name: "2 ** -3 = 0.125",
prepare: func(s *Stack) { s.Push(NewNumber(2.0, FloatMode)); s.Push(NewNumber(-3.0, FloatMode)) },
want: 0.125,
},
{
name: "10 ** -2 = 0.01",
prepare: func(s *Stack) { s.Push(NewNumber(10.0, FloatMode)); s.Push(NewNumber(-2.0, FloatMode)) },
want: 0.01,
},
{
name: "1.5 ** 3 = 3.375",
prepare: func(s *Stack) { s.Push(NewNumber(1.5, FloatMode)); s.Push(NewNumber(3.0, FloatMode)) },
want: 3.375,
},
{
name: "-2 ** 3 = -8",
prepare: func(s *Stack) { s.Push(NewNumber(-2.0, FloatMode)); s.Push(NewNumber(3.0, FloatMode)) },
want: -8.0,
},
{
name: "non-integer exponent",
prepare: func(s *Stack) { s.Push(NewNumber(2.0, FloatMode)); s.Push(NewNumber(1.5, FloatMode)) },
wantErr: true,
wantErrSub: "must be an integer",
},
{
name: "empty stack",
prepare: func(s *Stack) {},
wantErr: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
stack := NewStack()
tt.prepare(stack)
o := NewOperations(NewVariables(), nil)
err := o.FastPower(stack)
if tt.wantErr {
if err == nil {
t.Fatal("expected error, got nil")
}
if tt.wantErrSub != "" && !strings.Contains(err.Error(), tt.wantErrSub) {
t.Errorf("error = %q, want substring %q", err.Error(), tt.wantErrSub)
}
return
}
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
val, err := stack.Pop()
if err != nil {
t.Fatalf("Pop() error: %v", err)
}
got, err := toFloat64(val, "check")
if err != nil {
t.Fatalf("toFloat64() error: %v", err)
}
if math.Abs(got-tt.want) > 1e-9 {
t.Errorf("result = %v, want %v", got, tt.want)
}
})
}
}
func TestBinaryExponentiationFloat(t *testing.T) {
tests := []struct {
base float64
exp int
want float64
}{
{2, 10, 1024},
{3, 4, 81},
{5, 0, 1},
{2, -3, 0.125},
{10, 1, 10},
{10, 2, 100},
{2, 20, 1048576},
{0, 5, 0},
{0.5, 2, 0.25},
{7, 3, 343},
{1, 100, 1},
}
for _, tt := range tests {
t.Run("", func(t *testing.T) {
got := binaryExponentiationFloat(tt.base, tt.exp)
if math.Abs(got-tt.want) > 1e-9 {
t.Errorf("binaryExponentiationFloat(%v, %d) = %v, want %v", tt.base, tt.exp, got, tt.want)
}
})
}
}
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