expanded fri_test.go and implemented more for the fri verifier

field/field.go

@@ -1,6 +1,8 @@
 package field
 
 import (
+	"math/big"
+
 	"github.com/consensys/gnark-crypto/ecc"
 	"github.com/consensys/gnark/frontend"
 	"github.com/consensys/gnark/std/math/emulated"
@@ -28,3 +30,9 @@ func NewFieldAPI(api frontend.API) frontend.API {
 	}
 	return field
 }
+
+var r EmulatedField
+
+func EmulatedFieldModulus() *big.Int {
+	return r.Modulus()
+}