如何在 TestCaseSource 中使用 FormattableString[]

Question

我有一个 NUnit 测试需要测试一堆不同的 FormattableString 案例，我正在使用 TestCaseSource:

传递案例

static IEnumerable<TestCaseData> TestCaseSourceData()
{
    FormattableString data1 = FormattableStringFactory.Create("test{0}", 1);
    yield return new TestCaseData(new []{ data1 });
}

[TestCaseSource("TestCaseSourceData")]
public void FormattableStringTest(FormattableString[] coreMessages)
{
    //...
}

但这给了我一个错误：

System.ArgumentException : Object of type 'System.Runtime.CompilerServices.FormattableStringFactory+ConcreteFormattableString' cannot be converted to type 'System.FormattableString[]'.

System.ArgumentException : Object of type 'System.Runtime.CompilerServices.FormattableStringFactory+ConcreteFormattableString' cannot be converted to type 'System.FormattableString[]'.
   at System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
   at System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr)
   at System.Reflection.MethodBase.CheckArguments(StackAllocedArguments& stackArgs, ReadOnlySpan`1 parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at NUnit.Framework.Internal.Reflect.InvokeMethod(MethodInfo method, Object fixture, Object[] args)

现在如果我使用这个 TestCaseSource:

static IEnumerable<TestCaseData> TestCaseSourceData()
{
    FormattableString data1 = FormattableStringFactory.Create("test{0}", 1);
    yield return new TestCaseData(new []{ data1, data1 });
}

我得到一个不同的错误：

Too many arguments provided, provide at most 1 arguments.

我的代码有什么问题？我可以发送任何其他类型但不能发送 FormattableString.

Answer 1

您正在尝试将 FormattableString 转换为 FormattableString[] - 这就是错误消息所说的内容。

您有两个选择：

使用单个对象：

 [TestFixture]
 public class TestClass
 {
     public static IEnumerable<TestCaseData> TestCaseSourceData()
     {
         FormattableString data1 = FormattableStringFactory.Create("test{0}", 1);
         yield return new TestCaseData(new[] { data1 });
     }

     [TestCaseSource("TestCaseSourceData")]
     public void FormattableStringTest(FormattableString coreMessages)
     {
         Assert.True(true);
     }
 }

使用对象数组：

 [TestFixture]
 public class TestClass
 {
     public static IEnumerable<TestCaseData> TestCaseSourceData()
     {
         FormattableString data1 = FormattableStringFactory.Create("test{0}", 1);
         yield return new TestCaseData(new[] { new FormattableString[] { data1 } });
     }

     [TestCaseSource("TestCaseSourceData")]
     public void FormattableStringTest(FormattableString[] coreMessages)
     {
         Assert.AreEqual(1, coreMessages.Length);
     }
 }

如何在 TestCaseSource 中使用 FormattableString[]

How to use FormattableString[] in TestCaseSource

c#

nunit

formattablestring