c# – Visual Studio单元测试Assert.AreEqual失败,具有相同的预期值和实际值

在单元测试方面,我是一个全新的,所以请原谅我,如果这完全是无知的话.但即使我为预期和实际提供完全相同的值,我也无法通过单元测试.当我设置断点并逐步执行时,我已经确认预期变量和实际变量都是包含两个项目的字符串数组,blah和blah.但每次说“Assert.AreEqual失败时,测试仍然失败.预期：System.String []实际：System.String []”

namespace TestProject1

{
 public class Testing
 {
    public string[] PMDate(string lastPm)
    {
        if (string.IsNullOrEmpty(lastPm))
            return new []{"blah","blah"};
        string[] results = lastPm.Split(new[] {" "},StringSplitOptions.None);

        if (results.Length < 2)
            return new[] {"blah","blah"};

        return results;
    }
 }
[TestClass()]
public class UnitTest1
{
    [TestMethod()]
    public void PmDatetest()
    {
        Testing test = new Testing();
        string[] expected = test.PMDate("01/01/1900");
        string[] actual = test.PMDate("01/01/1900");
        Assert.AreEqual(expected,actual);
    }
}

}

var x = new[] { 0 };
var y = new[] { 0 };
Console.WriteLine(x.Equals(y));

CollectionAssert.AreEqual(expected,actual);