F＃XUnit测试不打印输出

Question

我在使用dotnet new xunit创建的项目中进行了以下XUnit测试：

type Scenarios(output : ITestOutputHelper) =

  [<Fact>]
  member __.``Output shows up`` () =
    output.WriteLine("I'm here")

此方法seems to have worked before，但无论我使用dotnet test还是dotnet xunit，运行测试都不会显示任何输出：

> dotnet test
Build started, please wait...
Build completed.

Test run for C:\Work\OSS\Streamstone.fs\tests\StreamstoneFs.Tests\bin\Debug\netcoreapp2.0\StreamstoneFs.Tests.dll(.NETCoreApp,Version=v2.0)
Microsoft (R) Test Execution Command Line Tool Version 15.6.0-preview-20180109-01
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
[xUnit.net 00:00:00.4295013]   Discovering: StreamstoneFs.Tests
[xUnit.net 00:00:00.4750480]   Discovered:  StreamstoneFs.Tests
[xUnit.net 00:00:00.4792986]   Starting:    StreamstoneFs.Tests
[xUnit.net 00:00:00.5964013]   Finished:    StreamstoneFs.Tests

Total tests: 1. Passed: 1. Failed: 0. Skipped: 0.
Test Run Successful.
Test execution time: 1.1835 Seconds

> dotnet xunit
Detecting target frameworks in StreamstoneFs.Tests.fsproj...
Building for framework netcoreapp2.0...
  StreamstoneFs -> C:\Work\OSS\Streamstone.fs\src\StreamstoneFs\bin\Debug\netstandard2.0\StreamstoneFs.dll
  StreamstoneFs.Tests -> C:\Work\OSS\Streamstone.fs\tests\StreamstoneFs.Tests\bin\Debug\netcoreapp2.0\StreamstoneFs.Tests.dll
Running .NET Core 2.0.0 tests for framework netcoreapp2.0...
xUnit.net Console Runner (64-bit .NET Core 4.6.00001.0)
  Discovering: StreamstoneFs.Tests
  Discovered:  StreamstoneFs.Tests
  Starting:    StreamstoneFs.Tests
  Finished:    StreamstoneFs.Tests
=== TEST EXECUTION SUMMARY ===
   StreamstoneFs.Tests  Total: 1, Errors: 0, Failed: 0, Skipped: 0, Time: 0.109s

我在这里做错了什么？

Answer 1

只有在单元测试失败时才能显示输出：

type StackOverflow(output : ITestOutputHelper) = 

    [<Fact>]
    member __.``Output shows up`` () =
        output.WriteLine("hello world, from output")
        printfn "Hello world, from printfn!"
        Assert.True(false)

这将给出输出：

Failed   Tests+StackOverflow.Output shows up
Error Message:
 Assert.True() Failure
Expected: True
Actual:   False
Stack Trace:
   at Tests.StackOverflow.Output shows up() in C:\git\dotnetTesting\Tests.fs:line 17
Standard Output Messages:
 hello world, from output

无论测试结果如何，printfn输出都不会显示。如果测试通过，则输出也不会显示。

从the docs开始，看起来输出是为调试而设计的，所以这是有道理的。在我看来，像dotnet命令行工具不能像Visual Studio在他们的例子中那样捕获输出。

Answer 2

通过使用import numpy as np import time shape = ( 20, 30, 40 ) ndata = int( 1e6 ) data = np.random.normal( loc = 10, scale = 5, size = ndata ) coords = np.vstack( [ np.random.uniform( 0, shape[i], ndata ) for i in range( len( shape ) ) ] ).T max_data = np.zeros( shape ) start = time.time() for i in range( len( data ) ) : # shortcut to find bin indices when the bins are # [ range( shape[i] ) for i in range( len( shape ) ) ] bin_indices = tuple( coords[i].astype( int ) ) max_data[ bin_indices ] = max( max_data[ bin_indices ], data[ i ] ) elapsed = time.time() - start print( 'elapsed: %.3e' % elapsed ) # 2.98 seconds on my computer

，我的输出显示出来而没有失败的测试

Console.SetOut

这是在Rider中工作的地方；它也可以在Visual Studio 2019中使用。我尚未在VSCode / Ionide中对其进行过测试。

我的答案结合了this和this。我不必为module StackOverflowTests open System.IO open System open Xunit open Xunit.Abstractions type Converter(output: ITestOutputHelper) = inherit TextWriter() override __.Encoding = stdout.Encoding override __.WriteLine message = output.WriteLine message override __.Write message = output.WriteLine message type StackOverflow(output : ITestOutputHelper) = do new Converter(output) |> Console.SetOut [<Fact>] member __.``Output shows up, for real`` () = output.WriteLine "ITestOutputHelper" printfn "printfn" printf "printf" Console.WriteLine("Console.WriteLine") 做任何事情。

Answer 3

这在带有.NET Core项目的VS Code中有效，尽管有点吵：

dotnet test --logger:"console;verbosity=detailed"