Ignore compiler warnings in unit tests

ICSharpCode.Decompiler/Tests/Helpers/Tester.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 			options.CompilerOptions = "/unsafe /o" + (flags.HasFlag(CompilerOptions.Optimize) ? "+" : "-") + (flags.HasFlag(CompilerOptions.UseDebug) ? " /debug" : "");
 			options.ReferencedAssemblies.Add("System.Core.dll");
 			CompilerResults results = provider.CompileAssemblyFromFile(options, sourceFileName);
-			if (results.Errors.Count > 0) {
+			if (results.Errors.Cast<CompilerError>().Any(e => !e.IsWarning)) {
 				StringBuilder b = new StringBuilder("Compiler error:");
 				foreach (var error in results.Errors) {
 					b.AppendLine(error.ToString());

ICSharpCode.Decompiler/Tests/TestRunner.cs

@@ -13,7 +13,7 @@ namespace ICSharpCode.Decompiler.Tests
 	[TestFixture]
 	public class TestRunner
 	{
-		const string TestCasePath = @"..\..\Tests\TestCases";
+		const string TestCasePath = @"../../Tests/TestCases";
 
 		[Test]
 		public void AllFilesHaveTests()