package engine

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestStatusTransitions_Valid(t *testing.T) {
	cases := []struct {
		from Status
		to   Status
		ok   bool
	}{
		{StatusIdle, StatusStarting, true},
		{StatusStarting, StatusActive, true},
		{StatusStarting, StatusFailed, true},
		{StatusActive, StatusIdle, true},     // user clicked Stop
		{StatusActive, StatusFailed, true},   // crash
		{StatusFailed, StatusStarting, true}, // user clicked Retry
		// Invalid transitions
		{StatusIdle, StatusActive, false},
		{StatusIdle, StatusFailed, false},
		{StatusActive, StatusStarting, false},
	}
	for _, c := range cases {
		got := isValidTransition(c.from, c.to)
		assert.Equalf(t, c.ok, got, "%s → %s", c.from, c.to)
	}
}