Change test_rng import to ark-std

ed_on_mnt4_298/src/constraints/mod.rs

@@ -19,7 +19,7 @@
 //! let cs = ConstraintSystem::<Fq>::new_ref();
 //! // This rng is just for test purposes; do not use it
 //! // in real applications.
-//! let mut rng = ark_ff::test_rng();
+//! let mut rng = ark_std::test_rng();
 //!
 //! // Generate some random `Fq` elements.
 //! let a_native = Fq::rand(&mut rng);
@@ -66,7 +66,7 @@
 //! # use ark_ed_on_mnt4_298::{*, constraints::*};
 //!
 //! # let cs = ConstraintSystem::<Fq>::new_ref();
-//! # let mut rng = ark_ff::test_rng();
+//! # let mut rng = ark_std::test_rng();
 //!
 //! // Generate some random `Edwards` elements.
 //! let a_native = EdwardsProjective::rand(&mut rng);

ed_on_mnt4_298/src/curves/tests.rs

@@ -1,5 +1,5 @@
 use ark_ec::{AffineCurve, ProjectiveCurve};
-use ark_ff::test_rng;
+use ark_std::test_rng;
 use rand::Rng;
 
 use crate::*;

ed_on_mnt4_298/src/fields/tests.rs

@@ -1,4 +1,4 @@
-use ark_ff::test_rng;
+use ark_std::test_rng;
 use rand::Rng;
 
 use crate::fields::*;