[Don't merge] demonstrate #1187

FAKE.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2013
-VisualStudioVersion = 12.0.31101.0
+# Visual Studio 14
+VisualStudioVersion = 14.0.24720.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{0F0488CC-2580-4C07-9E16-3997480F0221}"
 	ProjectSection(SolutionItems) = preProject
@@ -120,6 +120,9 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "assemblyinfo", "assemblyinf
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "testscripts", "testscripts", "{16D0306A-E2D0-444B-87F8-22605A1EC57C}"
 	ProjectSection(SolutionItems) = preProject
+		src\test\testscripts\fake-powershell-redirected.fsx = src\test\testscripts\fake-powershell-redirected.fsx
+		src\test\testscripts\fake-powershell-redirected.ps1 = src\test\testscripts\fake-powershell-redirected.ps1
+		src\test\testscripts\run-fake-powershell-redirected.bat = src\test\testscripts\run-fake-powershell-redirected.bat
 		src\test\testscripts\test1.fsx = src\test\testscripts\test1.fsx
 	EndProjectSection
 EndProject

build.fsx

@@ -167,6 +167,38 @@ Target "Test" (fun _ ->
     |>  xUnit id
 )
 
+Target "RunTestScripts" (fun _ ->
+
+    // copy all test scripts into the test directory and run them there so they don't mess up the source tree
+
+    let testScriptDir = testDir @@ "testScripts"
+
+    !! ("src/test/testscripts/*.*")
+    |> CopyFiles testScriptDir
+
+    let absFakeExe = "build/FAKE.exe" |> Path.absolute
+    let absBuildDir = "build" |> Path.absolute
+
+    !! (testScriptDir @@ "run-*.bat")
+    |> Seq.iter (fun ts ->
+        let currentDir = System.Environment.CurrentDirectory
+        try
+            System.Environment.CurrentDirectory <- testScriptDir
+            let result =
+                ExecProcess (fun info ->
+                    info.FileName <- ts
+                    info.WorkingDirectory <- "."
+                    info.EnvironmentVariables.["FAKE"] <- absFakeExe
+                    info.EnvironmentVariables.["FAKE_DIR"] <- absBuildDir
+                ) (System.TimeSpan.FromMinutes 3.0)
+
+            if result <> 0 then
+                failwithf "TestScript %s failed with %i" (Path.GetFileName ts) result
+        finally
+            System.Environment.CurrentDirectory <- currentDir
+    )
+)
+
 Target "Bootstrap" (fun _ ->
     let buildScript = "build.fsx"
     let testScript = "testbuild.fsx"
@@ -364,6 +396,7 @@ Target "Default" DoNothing
     ==> "BuildSolution"
     //==> "ILRepack"
     ==> "Test"
+    ==> "RunTestScripts"
     ==> "Bootstrap"
     ==> "Default"
     ==> "CopyLicense"

src/test/testscripts/fake-powershell-redirected.fsx

@@ -0,0 +1,7 @@
+#r @"FakeLib.dll"
+
+open Fake
+
+Target "Default" DoNothing
+
+RunTargetOrDefault "Default"

src/test/testscripts/fake-powershell-redirected.ps1

@@ -0,0 +1,11 @@
+$fake_exe = $env:FAKE
+$fake_dir = $env:FAKE_DIR
+if ([string]::IsNullOrWhiteSpace($fake_exe)) {
+    $fake_dir = "..\..\..\build"
+    $fake_exe = "$fake_dir\fake.exe"
+}
+
+# when this is set, powershell throws an exception when any process writes to STDERR
+$ErrorActionPreference = "Stop"
+# this issue only appears if the FAKE output is redirected to a file
+&"$fake_exe" "fake-powershell-redirected.fsx" 2>&1 > out-run-fake-powershell-redirected.log

src/test/testscripts/run-fake-powershell-redirected.bat

@@ -0,0 +1 @@
+powershell -ExecutionPolicy Bypass %cd%\fake-powershell-redirected.ps1