package systemd

import (
	"testing"
)

// TestParseUnitPropertiesRequiresExactProperties 验证属性解析严格接受恰好三个预期属性，并拒绝缺失、多余或重复属性。
func TestParseUnitPropertiesRequiresExactProperties(t *testing.T) {
	t.Parallel()
	unit, err := parseUnitProperties("yms-green.service", []byte("LoadState=loaded\nActiveState=inactive\nSubState=dead\n"))
	if err != nil {
		t.Fatalf("parse systemd properties: %v", err)
	}
	if unit.Name != "yms-green.service" || unit.LoadState != "loaded" || unit.ActiveState != "inactive" || unit.SubState != "dead" {
		t.Fatalf("unexpected unit: %+v", unit)
	}

	invalid := [][]byte{
		[]byte("LoadState=loaded\nActiveState=inactive\n"),
		[]byte("LoadState=loaded\nActiveState=inactive\nSubState=dead\nDescription=YMS\n"),
		[]byte("LoadState=loaded\nLoadState=loaded\nActiveState=inactive\nSubState=dead\n"),
	}
	for _, output := range invalid {
		if _, err := parseUnitProperties("yms-green.service", output); err == nil {
			t.Fatalf("expected exact property validation failure for %q", output)
		}
	}
}

// TestNewSystemctlRequiresAbsoluteExecutable 验证相对路径会被拒绝，绝对路径会被接受。
func TestNewSystemctlRequiresAbsoluteExecutable(t *testing.T) {
	t.Parallel()
	if _, err := NewSystemctl("systemctl"); err == nil {
		t.Fatal("expected relative executable path rejection")
	}
	manager, err := NewSystemctl("/usr/bin/systemctl")
	if err != nil || manager.executable != "/usr/bin/systemctl" {
		t.Fatalf("unexpected manager: manager=%+v err=%v", manager, err)
	}
}

// TestValidateUnitNamePreservesOpaqueValue 验证合法单元名被原样保留，空串或带首尾空白被拒绝。
func TestValidateUnitNamePreservesOpaqueValue(t *testing.T) {
	t.Parallel()
	if err := validateUnitName("backend-green.service"); err != nil {
		t.Fatalf("validate exact unit name: %v", err)
	}
	for _, name := range []string{"", " backend-green.service", "backend-green.service "} {
		if err := validateUnitName(name); err == nil {
			t.Fatalf("expected unit name rejection: %q", name)
		}
	}
}