mediocre-go-lib/mtest/mchk/mchk_test.go

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package mchk
import (
"errors"
. "testing"
"time"
"github.com/mediocregopher/mediocre-go-lib/mrand"
)
func TestCheckerRun(t *T) {
c := Checker{
Init: func() State { return 0 },
Next: func(State) Action {
if mrand.Intn(3) == 0 {
return Action{Params: -1}
}
return Action{Params: 1}
},
Apply: func(s State, a Action) (State, error) {
si := s.(int) + a.Params.(int)
if si > 5 {
return nil, errors.New("went over 5")
}
return si, nil
},
MaxLength: 4,
}
// 4 Actions should never be able to go over 5
if err := c.RunFor(time.Second); err != nil {
t.Fatal(err)
}
// 20 should always go over 5 eventually
c.MaxLength = 20
err := c.RunFor(time.Second)
if err == nil {
t.Fatal("expected error when maxDepth is 20")
} else if len(err.(RunErr).Params) < 6 {
t.Fatalf("strange RunErr when maxDepth is 20: %s", err)
}
t.Logf("got expected error with large maxDepth:\n%s", err)
caseErr := c.RunCase(err.(RunErr).Params...)
if caseErr == nil || err.Error() != caseErr.Error() {
t.Fatalf("unexpected caseErr: %v", caseErr)
}
}