Changed test AddReferenceWithoutArgumentResultsInAnError to check the error information more explicitly.

Author: MiYanni

test/dotnet.Tests/ParserTests/AddReferenceParserTests.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.CommandLine.Parsing;
 using Microsoft.DotNet.Cli;
 using Microsoft.DotNet.Cli.Utils;
 using Parser = Microsoft.DotNet.Cli.Parser;
@@ -50,13 +51,11 @@ public void AddReferenceWithoutArgumentResultsInAnError()
         {
             var result = Parser.Instance.Parse("dotnet add reference");
 
-            result
-                .Errors
-                .Select(e => e.Message)
-                .Should()
-                // This string comes from System.CommandLine:
-                // https://github.com/dotnet/command-line-api/blob/b4485d8417c4eb0ec3d1a291e1003686618ce598/src/System.CommandLine/Properties/Resources.resx#L135-L137
-                .BeEquivalentTo("Required argument missing for command: 'reference'.");
+            result.Errors.Should().NotBeEmpty();
+
+            var argument = (result.Errors.FirstOrDefault()?.SymbolResult as ArgumentResult)?.Argument;
+
+            argument.Should().Be(ReferenceAddCommandParser.ProjectPathArgument);
         }
     }
 }