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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package rpn
import (
"testing"
)
// TestBooleanOperators tests that boolean comparison operators work correctly.
func TestBooleanOperators(t *testing.T) {
tests := []struct {
name string
expression string
expected string
description string
}{
{
name: "gt true case",
expression: "5 3 gt",
expected: "true",
description: "5 > 3 = true",
},
{
name: "gt false case",
expression: "3 5 gt",
expected: "false",
description: "3 > 5 = false",
},
{
name: "gt equal case",
expression: "5 5 gt",
expected: "false",
description: "5 > 5 = false",
},
{
name: "lt true case",
expression: "3 5 lt",
expected: "true",
description: "3 < 5 = true",
},
{
name: "lt false case",
expression: "5 3 lt",
expected: "false",
description: "5 < 3 = false",
},
{
name: "gte true case",
expression: "5 5 gte",
expected: "true",
description: "5 >= 5 = true",
},
{
name: "gte false case",
expression: "3 5 gte",
expected: "false",
description: "3 >= 5 = false",
},
{
name: "lte true case",
expression: "5 5 lte",
expected: "true",
description: "5 <= 5 = true",
},
{
name: "lte false case",
expression: "5 3 lte",
expected: "false",
description: "5 <= 3 = false",
},
{
name: "eq true case",
expression: "5 5 eq",
expected: "true",
description: "5 == 5 = true",
},
{
name: "eq false case",
expression: "5 3 eq",
expected: "false",
description: "5 == 3 = false",
},
{
name: "neq true case",
expression: "5 3 neq",
expected: "true",
description: "5 != 3 = true",
},
{
name: "neq false case",
expression: "5 5 neq",
expected: "false",
description: "5 != 5 = false",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
vars := NewVariables()
rpnCalc := NewRPN(vars, nil)
result, err := rpnCalc.ParseAndEvaluate(tt.expression)
if err != nil {
t.Fatalf("Evaluate(%q) returned error: %v", tt.expression, err)
}
if result != tt.expected {
t.Errorf("Evaluate(%q) = %q, want %q (%s)", tt.expression, result, tt.expected, tt.description)
}
})
}
}
// TestBooleanToNumberCoercion tests that boolean values are automatically
// coerced to numbers (true → 1, false → 0) in arithmetic operations.
func TestBooleanToNumberCoercion(t *testing.T) {
tests := []struct {
name string
expression string
expected string
description string
}{
{
name: "true in addition",
expression: "true 5 +",
expected: "6",
description: "true (1) + 5 = 6",
},
{
name: "false in addition",
expression: "false 5 +",
expected: "5",
description: "false (0) + 5 = 5",
},
{
name: "true in multiplication",
expression: "true 5 *",
expected: "5",
description: "true (1) * 5 = 5",
},
{
name: "false in multiplication",
expression: "false 5 *",
expected: "0",
description: "false (0) * 5 = 0",
},
{
name: "false in subtraction",
expression: "5 false -",
expected: "5",
description: "5 - false (0) = 5",
},
{
name: "mixed boolean-numeric",
expression: "true false +",
expected: "1",
description: "true (1) + false (0) = 1",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
vars := NewVariables()
rpnCalc := NewRPN(vars, nil)
result, err := rpnCalc.ParseAndEvaluate(tt.expression)
if err != nil {
t.Fatalf("Evaluate(%q) returned error: %v", tt.expression, err)
}
if result != tt.expected {
t.Errorf("Evaluate(%q) = %q, want %q (%s)", tt.expression, result, tt.expected, tt.description)
}
})
}
}
// TestMixedBooleanNumericArithmetic tests mixed boolean-numeric arithmetic.
func TestMixedBooleanNumericArithmetic(t *testing.T) {
tests := []struct {
name string
expression string
expected string
description string
}{
{
name: "5 3 gt 1 +",
expression: "5 3 gt 1 +",
expected: "2",
description: "5 > 3 is true (1), 1 + 1 = 2",
},
{
name: "3 5 gt 1 +",
expression: "3 5 gt 1 +",
expected: "1",
description: "3 > 5 is false (0), 0 + 1 = 1",
},
{
name: "true 2 *",
expression: "true 2 *",
expected: "2",
description: "true (1) * 2 = 2",
},
{
name: "0 false +",
expression: "0 false +",
expected: "0",
description: "0 + false (0) = 0",
},
{
name: "9 3 gt 4 5 lt +",
expression: "9 3 gt 4 5 lt +",
expected: "2",
description: "9 > 3 is true (1), 4 < 5 is true (1), 1 + 1 = 2",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
vars := NewVariables()
rpnCalc := NewRPN(vars, nil)
result, err := rpnCalc.ParseAndEvaluate(tt.expression)
if err != nil {
t.Fatalf("Evaluate(%q) returned error: %v", tt.expression, err)
}
if result != tt.expected {
t.Errorf("Evaluate(%q) = %q, want %q (%s)", tt.expression, result, tt.expected, tt.description)
}
})
}
}
// TestBooleanShowFormat tests that Show command displays boolean values as true/false
func TestBooleanShowFormat(t *testing.T) {
tests := []struct {
name string
expression string
expected string
}{
{
name: "show true",
expression: "true show",
expected: "true",
},
{
name: "show false",
expression: "false show",
expected: "false",
},
{
name: "show mixed stack",
expression: "1 true 2 show",
expected: "1 true 2",
},
{
name: "show comparison result",
expression: "5 3 gt show",
expected: "true",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
vars := NewVariables()
rpnCalc := NewRPN(vars, nil)
result, err := rpnCalc.ParseAndEvaluate(tt.expression)
if err != nil {
t.Fatalf("Evaluate(%q) returned error: %v", tt.expression, err)
}
if result != tt.expected {
t.Errorf("Evaluate(%q) = %q, want %q", tt.expression, result, tt.expected)
}
})
}
}
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