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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package rpn
import (
"fmt"
"strings"
"testing"
)
func TestNewVariables(t *testing.T) {
v := NewVariables()
if v == nil {
t.Fatal("NewVariables() returned nil")
}
if v.Count() != 0 {
t.Errorf("NewVariables() count = %d, want 0", v.Count())
}
}
func TestSetVariable(t *testing.T) {
v := NewVariables()
tests := []struct {
name string
value float64
}{
{"x", 5.0},
{"pi", 3.14159},
{"result", 42.0},
{"alpha", -10.5},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
err := v.SetVariable(tt.name, tt.value)
if err != nil {
t.Fatalf("SetVariable(%q, %v) returned error: %v", tt.name, tt.value, err)
}
value, exists := v.GetVariable(tt.name)
if !exists {
t.Errorf("Variable %q should exist after SetVariable", tt.name)
}
if value != tt.value {
t.Errorf("GetVariable(%q) = %v, want %v", tt.name, value, tt.value)
}
})
}
}
func TestGetVariable(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("test", 100.0)
tests := []struct {
name string
value float64
expected bool
}{
{"test", 100.0, true},
{"nonexistent", 0, false},
{"", 0, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
value, exists := v.GetVariable(tt.name)
if exists != tt.expected {
t.Errorf("GetVariable(%q) exists = %v, want %v", tt.name, exists, tt.expected)
}
if exists && value != tt.value {
t.Errorf("GetVariable(%q) = %v, want %v", tt.name, value, tt.value)
}
})
}
}
func TestDeleteVariable(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("temp", 50.0)
// Delete existing variable
deleted := v.DeleteVariable("temp")
if !deleted {
t.Error("DeleteVariable(\"temp\") should return true for existing variable")
}
if v.Count() != 0 {
t.Errorf("Count after delete = %d, want 0", v.Count())
}
// Delete non-existent variable
deleted = v.DeleteVariable("nonexistent")
if deleted {
t.Error("DeleteVariable(\"nonexistent\") should return false for non-existent variable")
}
}
func TestListVariables(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("z", 3.0)
_ = v.SetVariable("a", 1.0)
_ = v.SetVariable("m", 2.0)
infos := v.ListVariables()
if len(infos) != 3 {
t.Errorf("ListVariables() returned %d variables, want 3", len(infos))
}
// Verify sorted order
expectedOrder := []string{"a", "m", "z"}
for i, info := range infos {
if info.Name != expectedOrder[i] {
t.Errorf("ListVariables()[%d] name = %q, want %q", i, info.Name, expectedOrder[i])
}
}
}
func TestClearVariables(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("x", 1.0)
_ = v.SetVariable("y", 2.0)
_ = v.SetVariable("z", 3.0)
v.ClearVariables()
if v.Count() != 0 {
t.Errorf("Count after ClearVariables() = %d, want 0", v.Count())
}
// Verify all variables are gone
_, exists := v.GetVariable("x")
if exists {
t.Error("Variable x should not exist after ClearVariables()")
}
}
func TestFormatVariables(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("pi", 3.14159)
_ = v.SetVariable("e", 2.71828)
formatted := v.FormatVariables()
if strings.Contains(formatted, "No variables defined") {
t.Error("Formatted variables should not show 'No variables defined' when variables exist")
}
if !strings.Contains(formatted, "pi") || !strings.Contains(formatted, "e") {
t.Errorf("Formatted variables should contain all variable names, got: %s", formatted)
}
}
func TestFormatVariablesEmpty(t *testing.T) {
v := NewVariables()
formatted := v.FormatVariables()
if !strings.Contains(formatted, "No variables defined") {
t.Errorf("Empty variables should show 'No variables defined', got: %s", formatted)
}
}
func TestHasVariable(t *testing.T) {
v := NewVariables()
_ = v.SetVariable("exists", 1.0)
tests := []struct {
name string
expected bool
}{
{"exists", true},
{"nonexistent", false},
{"", false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if v.HasVariable(tt.name) != tt.expected {
t.Errorf("HasVariable(%q) = %v, want %v", tt.name, v.HasVariable(tt.name), tt.expected)
}
})
}
}
func TestErrVariableNotFound(t *testing.T) {
v := NewVariables()
_, exists := v.GetVariable("nonexistent")
if exists {
t.Error("GetVariable on non-existent variable should return exists=false")
}
}
func TestErrInvalidVariableName(t *testing.T) {
v := NewVariables()
err := v.SetVariable("", 1.0)
if err != ErrInvalidVariableName {
t.Errorf("SetVariable with empty name should return ErrInvalidVariableName, got %v", err)
}
}
func TestVariableConcurrency(t *testing.T) {
v := NewVariables()
done := make(chan bool, 100)
// Concurrent writes
for i := 0; i < 50; i++ {
go func(id int) {
name := fmt.Sprintf("var%d", id)
_ = v.SetVariable(name, float64(id))
done <- true
}(i)
}
// Concurrent reads
for i := 0; i < 50; i++ {
go func(id int) {
name := fmt.Sprintf("var%d", id)
v.GetVariable(name)
done <- true
}(i)
}
// Wait for all operations
for i := 0; i < 100; i++ {
<-done
}
// Verify final count
if v.Count() != 50 {
t.Errorf("Final count = %d, want 50", v.Count())
}
}
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