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Peter S | 17 May 2012 15:01
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Re: Re: testing/quick, help needed

Implementing the quick.Generator interface for MyInt, as described in the godoc for quick.Value(), seems to work: http://play.golang.org/p/MiVBYKw5wJ


That being said, I also have doubts whether the panic in your example is the intended behavior; returning false for "ok" would seem more sensible.

Hope that helps,

Peter


On Thu, May 17, 2012 at 10:16 AM, Dave Cheney <dave-7L4Cwp9BzA+sTnJN9+BGXg@public.gmane.org> wrote:
Hello,

I hit a problem adding more test cases to a test that uses testing/quick. Here is a small example of the problem I hit. Is anyone able to offer any suggestions how I can use testing/quick when the structs contain derived types.

% cat quicktest.go
package main

import (
        "math/rand"
        "testing/quick"
        "reflect"
)

type Works struct {
        A int
        B string
        C float64
}

type MyInt int 

type Fails struct {
        A MyInt
        B string
        C float64
}

var types = []interface{} {
        Works{},
        Fails{},
}

func main() {
        rand := rand.New(rand.NewSource(0))
        for _, iface := range types {
                ty := reflect.ValueOf(iface).Type()
                quick.Value(ty, rand)
        }
}

% go run quicktest.go 
panic: reflect.Set: value of type int is not assignable to type main.MyInt

goroutine 1 [running]:
reflect.Value.assignTo(0x63348, 0xedf354c3, 0x20, 0xa71a4, 0x6c6665720000000b, ...)
        /Users/dfc/go/src/pkg/reflect/value.go:1781 +0x41a
reflect.Value.Set(0x63528, 0x421544c0, 0x26, 0x63348, 0xedf354c3, ...)
        /Users/dfc/go/src/pkg/reflect/value.go:1197 +0xa2
testing/quick.Value(0x42174000, 0x915c8, 0x42155220, 0x0, 0x0, ...)
        /Users/dfc/go/src/pkg/testing/quick/quick.go:137 +0x10e5
main.main()
        /Users/dfc/devel/src/quicktest.go:32 +0x130

goroutine 2 [syscall]:
created by runtime.main
        /Users/dfc/go/src/pkg/runtime/proc.c:221
exit status 2


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