這裏是我的兩分錢這一挑戰。簡單地說,創建一個新的AppSettings類作爲抽象層。在正常操作下,它只會從應用程序配置文件中讀取設置。但是單元測試可以覆蓋每個線程的設置,允許單元測試與不同的設置並行執行。
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;
}
在應用程序代碼,用靜態屬性訪問設置:
function void MyApplicationMethod() {
string setting1 = AppSettings.Setting1;
string setting2 = AppSettings.Setting2;
}
在單元測試中,任選地重寫選定的設置:
[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:作爲的AppSettings的所有方法類被聲明爲內部的,所以有必要使用以下屬性使其對單元測試裝配可見: [assembly:InternalsVisibleTo(「<程序集名稱>,PublicKey = <公鑰>「)]
您能更好地解釋用例嗎?爲什麼你需要在運行時更改tests.dll.config? –
這是完全一樣的問題,這一個:http://stackoverflow.com/questions/168931/unit-testing-the-app-config-file-with-ununit –
好的,我想它可以被關閉。感謝指針。 – FunLovinCoder