This is an extremely strange issue- I have some Powershell code and a XAML GUI I made with Visual Studio for a fairly basic app for users. I'm fairly experienced with Powershell, but completely new to XAML.
Here's the code snippet:
`
$var_RKH.Add_Click({
$targetSite = $RKH
$var_TargetSite.Content = "Rock Hill"
})
`
Somehow, $targetSite is still null after this click event. I've confirmed the var $RKH contains the needed data. In another click event on another button, I copy-pasted that same line and it works. However, what's absolutely twisted my brain is- the third line works. The $var_TargetSite.Content variable is correctly updated.
So the click event is definitely firing, the second line just gets completely skipped somehow, and the third line works fine. On other click events, the exact same code works fine. I must be missing something very simple because this is absolutely twisting my brain.
Script blocks aren't really scopes. They're script blocks and do not inherit from enclosing scope. Instead, you pass values into it just like you would for a thread in C#. This can get confusing because both scopes and script blocks get the {} delimiter -- they're not the same though and not interchangeable either:
[scriptblock]$Sb = {'This is a test'}
if($true) $sb
will throw a ParserError exception rather than print 'this is a test'.
Please be very careful about "sideloading" variables, especially with WPF; there is a high degree of multithread in any WPF application and you literally don't know who is going to access what when.
If you can, try to resolve the value of $RKH inside the script block rather than try to force it in.
Or you could implement code-behind for the XAML and put both .xaml and .xaml.cs in an assembly, then use that in PS.
Related
Alright, so I'm learning codesys in school and I'm using Function-Blocks. However they didn't seem to update when updating local variables, so I made a test, the one you can see below.
As you can see, in the FB below, "GVL.sw1" becomes True, but "a" doesen't. Why does it not become True? I tested a friends code and his worked just fine, but mine doesen't...
https://i.stack.imgur.com/IpPPZ.png
Comment from reddit
You are showing the source code for a program called "main". You have
a task running called "Main_Task". The program and task are not
directly related.
Is "main" being called anywhere.
So i added main to the "main task" and it worked. I have no idea why it didn't work in the real assignment but maybe I'll solve it now that i have gotten this far.
In your example you have 2 programs (PRG): main and PLC_PRG.
Creating a program doesn't mean that it will be executed/run. For that you need to add the program to a Task in the Task Configuration. Each Task will be, by default, executed on every cycle according to the priority they are configured with (you could also have them be executed on an event and etc. instead). When a Task is executed, each program added to that Task will be executed in the order they are placed (you can reorder them any time).
With that said, if you look at your Task Configuration, the MainTask only has the program PLC_PRG added, so only that program will run. The main program that you are inspecting is never even run.
Well the system we have has a bunch of dependencies, but I'll try to summarize what's going on without divulging too much details.
Test assembly in the form of a .dll is the one being executed. A lot of these tests call an API.
In the problematic method, there's 2 API calls that have an await on them: one to write a record to that external interface, and another to extract all records and then read the last one in that external interface, both via API. The test is simply to check if writing the last record was successful in an end-to-end context, that's why there's both a write and then a read.
If we execute the test in Visual Studio, everything works as expected. I also tested it manually via command lining vstest.console.exe, and the expected results always come out as well.
However, when it comes to VS Test task in VSTS, it fails for some reason. We've been trying to figure it out, and eventually we reached the point where we printed the list from the 'read' part. It turns out the last record we inserted isn't in the data we pulled, but if we check the external interface via a different method, we confirmed that the write process actually happened. What gives? Why is VSTest getting like an outdated set of records?
We also noticed two things:
1.) For the tests that passed, none of the Console.WriteLine outputs appear in the logs. Only on Failed test do they do so.
2.) Even if our Data.Should.Be call is at the very end of the TestMethod, the logs report the fail BEFORE it prints out the lines! And even then, the printing should happen after reading the list of records, and yet when the prints do happen we're still missing the record we just wrote.
Is there like a bottom-to-top thing we're missing here? It really seems to me like VSTS vstest is executing the assert before the actual code. The order of TestMethods happen the right order though (the 4th test written top-to-bottom in the code is executed 4th rather than 4th to last) and we need them to happen in the right order because some of the later tests depend on the former tests succeeding.
Anything we're missing here? I'd put a source code but there's a bunch of things I need to scrub first if so.
Turns out we were sorely misunderstanding what 'await' does. We're using .Wait() instead for the culprit and will also go back through the other tests to check for quality.
Currently, I have a script black boxed, but I still have to step through that code. It doesn't actually show the code, but I still have to press the button to step through it, which kind of defeats the purpose. I want to be able to just skip all blackboxed code and go directly to the code that isn't blackboxed, even if the blackboxed code calls non-blackboxed code...so, I don't want to just step over the blackboxed code, but I don't want to step through each individual step in the black boxed code to get to the non black boxed code...is this possible?
If you black-box a script, the debugger doesn't step into the script file at all. You shouldn't have to keep stepping through code inside it. If you are, then either it's a source mapping issue, which I've seen before, or you specifically put breakpoints in the black-boxed script. See further down.
For example, take scripts A, B and C. B calls some function in C, A calls a function in B, but B is black-boxed. You pause on the A call, you step into the function, but instead of the debugger going into B's function, you'll end up in C's function straight away. You can try it with the following:
Main page
<script src="c.js"></script>
<script src="b.js"></script>
<script src="a.js"></script>
a.js
window.bFunc();
b.js
window.bFunc = function() {
window.cFunc();
}
b.js
window.cFunc = function() {
console.log('called cFunc');
}
If you put breakpoints in the blackboxed script (e.g. B in this case), it will break on them, but not step into the code. Obviously, you can disable those breakpoints to continue stepping into other code. The important thing is that these breakpoints YOU explicitly put there, so you control that.
If there's particular behaviour you are not keen on, or have suggestions, post a comment in the DevTools: New blackbox implementation Chromium thread. The last comment discuses the point above and the benefit of the debugger not ignoring the blackboxed breakpoints.
I am calling a series of PowerShell functions from a master script (each function is a test).
I specify the tests in an XML file and I want them to run in order.
The functions to call are organized in PowerShell module files (.psm1). The master script calls Import-Module as needed and then calls the function via something like this...
$newResults = & "$runFunction" #ARGS
or this...
$newResults = Invoke-Expression $runFunctionWithArgs
I have gotten both to work just fine and the XML file parsing invokes these commands in the correct order.
Problem: The tests are apparently launched asynchronously so that the first test I launch does not necessarily get invoked and complete before the second test is invoked.
Note, the tests are functions in a PowerShell module and not commands so I do not think that Start-Process will work (but please tell me if you know how to make that work).
More Details:
It would take too much to add all the code, but essentially what each function call does is create a hashtable with one or more "TestResult" objects. "TestResult" has things like Success codes and a TimeStamp. Each test does things that take different amounts of time, but all synchronous. I would expect the timestamps to be the same order that I called each test, especially since the first thing each test does is get the timestamp so it should not depend on what the test does. When I run in the ISE, everything goes in order. When I run in the command window, the timestamps do not match my expected order.
Workaround:
My working theory is still that PowerShell is somehow parallelizing the calls. I can get consistent results by making the invocation of each call dependent on the results of the previous call. It is a dummy check because I know that what I test will always be true, but PowerShell doesn't know that
if ($newResults.Count -ne [Long]::MaxValue) { $newResults = & "$runFunction" #ARGS }
PowerShell thinks that it needs to know if the previous call count is not MaxValue.
I am trying to write unit tests for a bit of code involving Events. Since I need to raise an event at will, I've decided to rely upon RhinoMocks to do so for me, and then make sure that the results of the events being raised are as expected (when they click a button, values should change in a predictable manner, in this example, the height of the object should decrease)
So, I do a bit of research and realize I need an Event Raiser for the event in question. Then it's as simple as calling eventraiser.Raise(); and we're good.
The code for obtaining an event raiser I've written as is follows (written in C#) (more or less copied straight off the net)
using (mocks.Record())
{
MyControl testing = mocks.DynamicMock<MyControl>();
testing.Controls.Find("MainLabel",false)[0].Click += null;
LastCall.IgnoreArguments();
LastCall.Constraints(Rhino.Mocks.Constraints.Is.NotNull());
Raiser1 = LastCall.GetEventRaiser();
}
I then test it as In playback mode.
using (mocks.Playback())
{
MyControl thingy = new MyControl();
int temp=thingy.Size.Height;
Raiser1.Raise();
Assert.Greater(temp, thingy.Size.Height);
}
The problem is, when I run these tests through NUnit, it fails. It throws an exception at the line testing.Controls.Find("MainLabel",false)[0].Click += null; which complains about trying to add null to the event listener. Specifically, "System.NullReferenceException: Object Reference not set to an instance of the Object"
Now, I was under the understanding that any code under the Mocks.Record heading wouldn't actually be called, it would instead create expectations for code calls in the playback. However, this is the second instance where I've had a problem like this (the first problem involved classes/cases that where a lot more complicated) Where it appears in NUnit that the code is actually being called normally instead of creating expectations. I am curious if anyone can point out what I am doing wrong. Or an alternative way to solve the core issue.
I'm not sure, but you might get that behaviour if you haven't made the event virtual in MyControl. If methods, events, or properties aren't virtual, then I don't think DynamicMock can replace their behaviour with recording and playback versions.
Personally, I like to define interfaces for the classes I'm going to mock out and then mock the interface. That way, I'm sure to avoid this kind of problem.