stdout 相关问题

公共静态类实用程序 { /// /// 创建一个写入文件或控制台流的 Writer 对象。 /// /// public static class Utils { /// <summary> /// Creates a Writer object that writes either to a file or to a console stream. /// </summary> /// <param name="outFname">file name, "stdout" or "stderr"</param> /// <param name="ifAppend">if true, append to existing file; otherwise, overwrite</param> /// <returns>A TextWriter object that can be used to write output.</returns> public static StreamWriter OutWriter(string outFname, bool ifAppend) { if (string.IsNullOrEmpty(outFname) || outFname == "stdout") { return new StreamWriter(Console.OpenStandardOutput()); } else if (outFname == "stderr") { return new StreamWriter(Console.OpenStandardError()); } else { FileStream fileStream; if (ifAppend) fileStream = new FileStream(outFname, FileMode.Append, FileAccess.Write, FileShare.None); else fileStream = new FileStream(outFname, FileMode.Create, FileAccess.Write, FileShare.None); return new StreamWriter(fileStream, Encoding.UTF8); } } } [TestMethod] public void OutWriter_ShouldReturnConsoleError_ForStderr() { // Capture the current Console.Error TextWriter originalError = Console.Error; // Redirect Console.Error to a StringWriter to capture the output StringWriter errorWriter = new StringWriter(); Console.SetError(errorWriter); using (StreamWriter writer = Utils.OutWriter("stderr", false)) { // Write something to the StreamWriter writer.WriteLine("Test error output"); writer.Flush(); // Ensure the output is flushed } // Reset the Console.Error to its original state Console.SetError(originalError); // Verify that the output was written to the StringWriter string expectedOutput = "Test error output" + Environment.NewLine; string actualOutput = errorWriter.ToString(); Assert.AreEqual(expectedOutput, actualOutput, "The writer should write to Console.Error."); } 测试输出： Test Name: OutWriter_ShouldReturnConsoleError_ForStderr Test FullName: PdbLibTests.UtilsTests.OutWriter_ShouldReturnConsoleError_ForStderr Test Source: C:\git\MyProject_csharp\unit_test_for_Utils\UtilsTests.cs : line 15 Test Outcome: Failed Test Duration: 0:00:00.1644456 Result StackTrace: at PdbLibTests.UtilsTests.OutWriter_ShouldReturnConsoleError_ForStderr() in C:\git\MyProject_csharp\unit_test_for_Utils\UtilsTests.cs:line 37 Result Message: Assert.AreEqual failed. Expected:<Test error output >. Actual:<>. The writer should write to Console.Error. 为什么单元测试没有成功？如何才能成功？然后我尝试嘲笑控制台： public static class MockConsole { public static StringWriter ErrorWriter { get; private set; } public static TextWriter OriginalError { get; private set; } public static void Initialize() { OriginalError = Console.Error; ErrorWriter = new StringWriter(); Console.SetError(ErrorWriter); } public static void Reset() { Console.SetError(OriginalError); ErrorWriter.Dispose(); } } [TestMethod] public void OutWriter_ShouldReturnConsoleError_ForStderr() { // Initialize mock console MockConsole.Initialize(); using (StreamWriter writer = Utils.OutWriter("stderr", false)) { // Write something to the StreamWriter writer.WriteLine("Test error output"); writer.Flush(); // Ensure the output is flushed } // Capture the output written to the error writer string actualOutput = MockConsole.ErrorWriter.ToString(); // Reset the console to its original state MockConsole.Reset(); // Verify that the output was written to the StringWriter string expectedOutput = "Test error output" + Environment.NewLine; Assert.AreEqual(expectedOutput, actualOutput, "The writer should write to Console.Error."); } 这也没有成功。 Console.OpenStandardError() 打开一个（新的）标准错误流，无论它之前是什么。使用 Console.Error 属性获取您使用 Console.SetError() 分配的模拟对象。

c# unit-testing stdout stderr

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