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FsCheck: How to generate test data that depends on other test data?


FsCheck: How to generate test data that depends on other test data?

By : WeAreSynergy
Date : November 19 2020, 03:01 PM
Does that help You can create generators which depend on values generated from another using SelectMany. This also allows you to use the LINQ query syntax e.g.
code :
var gen = from s in Arb.Generate<NonEmptyString>()
          from i in Gen.Choose(0, s.Get.Length - 1)
          select Tuple.Create(s, i);

var p = Prop.ForAll(Arb.From(gen), t =>
{
    var s = t.Item1.Get;
    var len = t.Item2;
    return s.Substring(0, len).Length <= s.Length;
});

Check.Quick(p);


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How to make a PHPUnit test that depends on ~real~ POST/GET data?

How to make a PHPUnit test that depends on ~real~ POST/GET data?


By : Mary
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can't fake raw POST data. But the problem lies in your code: it's not unit-testable. Instead of:
code :
if (filter_input(INPUT_POST,'name',FILTER_UNSAFE_RAW) && filter_input(INPUT_POST,'age', FILTER_VALIDATE_INTEGER)) {
    $url = filter_input(INPUT_POST,'url',FILTER_SANITIZE_URL);
}
if (filter_var($data['name'], FILTER_UNSAFE_RAW) && filter_var($data['age'], FILTER_VALIDATE_INT)) {
    $url = filter_var($data['url'], FILTER_SANITIZE_URL);
}
// where $data is a copy of $_POST in that case
In FsCheck, how to generate a test record with non-negative fields?

In FsCheck, how to generate a test record with non-negative fields?


By : user3777440
Date : March 29 2020, 07:55 AM
This might help you In F#, I have a record with a few fields: , Try this:
code :
type Generators = 
    static member arbMyRecord =
        fun (a,b,c) -> { myRecord.a = a; b = b; c = c }
        <!> (Arb.generate<float> |> Gen.suchThat ((<) 0.) |> Gen.three)
        |> Arb.fromGen

Arb.register<Generators>() |> ignore
Check.Quick verify_this_property
type Generators = 
    static member arbMyRecord =
        Arb.generate<float> 
        |> Gen.suchThat ((<) 0.) 
        |> Gen.three
        |> Gen.map (fun (a,b,c) -> { myRecord.a = a; b = b; c = c })
        |> Arb.fromGen
Check.Quick (forAll Generators.arbMyRecord verify_this_property)
How do I just generate data with fscheck?

How do I just generate data with fscheck?


By : Elm Exposed
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Edit: this function is now part of the FsCheck API (Gen.sample) so you don't need the below anymore...
Here is a sample function to generate n samples from a given generator:
code :
let sample n gn  = 
   let rec sample i seed samples =
       if i = 0 then samples
       else sample (i-1) (Random.stdSplit seed |> snd) (Gen.eval 1000 seed gn :: samples)
   sample n (Random.newSeed()) []
fscheck doesn't generate random enough data

fscheck doesn't generate random enough data


By : Belarmino Silva
Date : March 29 2020, 07:55 AM
I wish this help you When you use Check.QuickThrowOnFailure, it uses the configuration Config.QuickThrowOnFailure, which has these values:
code :
> Config.QuickThrowOnFailure;;
val it : Config =
  {MaxTest = 100;
   MaxFail = 1000;
   Replay = null;
   Name = "";
   StartSize = 1;
   EndSize = 100;
   QuietOnSuccess = false;
   Every = <fun:get_Quick@342>;
   EveryShrink = <fun:get_Quick@343-1>;
   Arbitrary = [];
   Runner = <StartupCode$FsCheck>.$Runner+get_throwingRunner@355;}
> Check.One({Config.QuickThrowOnFailure with EndSize = 1000}, fun (a:int) -> (add a 0) = a);;
System.Exception: Falsifiable, after 15 tests (0 shrinks) (StdGen (1912816373,296229213)):
Original:
101
with exception:
> System.Exception: nasty bug
   at FSI_0040.add(Int32 a, Int32 b)
   at FSI_0055.it@69-6.Invoke(Int32 a)
   at FsCheck.Testable.evaluate[a,b](FSharpFunc`2 body, a a) in C:\Users\Kurt\Projects\FsCheck\FsCheck\src\FsCheck\Testable.fs:line 161

   at <StartupCode$FsCheck>.$Runner.get_throwingRunner@365-1.Invoke(String message) in C:\Users\Kurt\Projects\FsCheck\FsCheck\src\FsCheck\Runner.fs:line 365
   at <StartupCode$FsCheck>.$Runner.get_throwingRunner@355.FsCheck-IRunner-OnFinished(String , TestResult ) in C:\Users\Kurt\Projects\FsCheck\FsCheck\src\FsCheck\Runner.fs:line 365
   at FsCheck.Runner.check[a](Config config, a p) in C:\Users\Kurt\Projects\FsCheck\FsCheck\src\FsCheck\Runner.fs:line 275
   at <StartupCode$FSI_0055>.$FSI_0055.main@()
Stopped due to error
How to unit test BroadcastProcessFunction in flink when processElement depends on broadcasted data

How to unit test BroadcastProcessFunction in flink when processElement depends on broadcasted data


By : user2410548
Date : March 29 2020, 07:55 AM
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