这里是我的两分钱这一挑战。简单地说,创建一个新的AppSettings类作为抽象层。在正常操作下,它只会从应用程序配置文件中读取设置。但是单元测试可以覆盖每个线程的设置,允许单元测试与不同的设置并行执行。
internal sealed class AppSettings
{
private static readonly AppSettings instance;
private static ConcurrentDictionary<int, AppSettings> threadInstances;
private string _setting1;
private string _setting2;
static AppSettings() { instance = new AppSettings(); }
internal AppSettings(string setting1 = null, string setting2 = null) {
_setting1 = setting1 != null ? setting1 : Properties.Settings.Default.Setting1;
_setting2 = setting2 != null ? setting2 : Properties.Settings.Default.Setting2;
}
internal static AppSettings Instance {
get {
if (threadInstances != null) {
AppSettings threadInstance;
if (threadedInstances.TryGetValue(Thread.CurrentThread.ManagedThreadId, out threadInstance)) {
return threadInstance;
}
}
return instance;
}
set {
if (threadInstances == null) {
lock (instance) {
if (threadInstances == null) {
int numProcs = Environment.ProcessorCount;
int concurrencyLevel = numProcs * 2;
threadInstances = new ConcurrentDictionary<int, AppSettings>(concurrencyLevel, 5);
}
}
}
if (value != null) {
threadInstances.AddOrUpdate(Thread.CurrentThread.ManagedThreadId, value, (key, oldValue) => value);
} else {
AppSettings threadInstance;
threadInstances.TryRemove(Thread.CurrentThread.ManagedThreadId, out threadInstance);
}
}
}
internal static string Setting1 => Instance._setting1;
internal static string Setting2 => Instance._setting2;
}
在应用程序代码,用静态属性访问设置:
function void MyApplicationMethod() {
string setting1 = AppSettings.Setting1;
string setting2 = AppSettings.Setting2;
}
在单元测试中,任选地重写选定的设置:
[TestClass]
public class MyUnitTest
{
[TestCleanup]
public void CleanupTest()
{
//
// Clear any app settings that were applied for the current test runner thread.
//
AppSettings.Instance = null;
}
[TestMethod]
public void MyUnitMethod()
{
AppSettings.Instance = new AppSettings(setting1: "New settings value for current thread");
// Your test code goes here
}
}
注意:作为的AppSettings的所有方法类被声明为内部的,所以有必要使用以下属性使其对单元测试装配可见: [assembly:InternalsVisibleTo(“<程序集名称>,PublicKey = <公钥>“)]
您能更好地解释用例吗?为什么你需要在运行时更改tests.dll.config? –
这是完全一样的问题,这一个:http://stackoverflow.com/questions/168931/unit-testing-the-app-config-file-with-ununit –
好的,我想它可以被关闭。感谢指针。 – FunLovinCoder