Added Try tests

test/helpers.go

@@ -4,6 +4,7 @@
 package test
 
 import (
+	"errors"
 	"io"
 
 	"git.codemonkeysoftware.net/b/gigaparsec"
@@ -34,3 +35,22 @@ func SliceOfN[T any](value T, n int) []T {
 	}
 	return s
 }
+
+type ForcedResult struct{ Succeed, Consume bool }
+
+func ForceResult(state gigaparsec.State[ForcedResult]) (gigaparsec.Result[ForcedResult, struct{}], error) {
+	buf := make([]ForcedResult, 1)
+	_, next, err := state.Read(buf)
+	if errors.Is(err, io.EOF) {
+		return gigaparsec.Fail[ForcedResult, struct{}](false, gigaparsec.MessageEnd(state.Pos())), nil
+	}
+	if err != nil {
+		return gigaparsec.Result[ForcedResult, struct{}]{}, err
+	}
+	tok := buf[0]
+	if tok.Succeed {
+		return gigaparsec.Succeed(tok.Consume, struct{}{}, next, gigaparsec.MessageOK(state.Pos())), nil
+	} else {
+		return gigaparsec.Fail[ForcedResult, struct{}](tok.Consume, gigaparsec.MakeMessage(state.Pos(), "Succeed=false", "Succeed=true")), nil
+	}
+}