@@ -14,7 +14,7 @@ runs-on: ubuntu-latest
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
     - name: Install Rust
       uses: actions-rs/toolchain@v1
       with:
@@ -41,7 +41,7 @@ - stable
           - nightly
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install Rust (${{ matrix.rust }})
         uses: actions-rs/toolchain@v1
@@ -78,7 +78,6 @@ command: check
             args: --all-features --examples --workspace --benches
         if: matrix.rust == 'nightly'
 
-      
 
   directories: # Job that list subdirectories
     name: List directories for parallelizing tests
@@ -86,7 +85,7 @@ runs-on: ubuntu-latest
     outputs:
       dir: ${{ steps.set-dirs.outputs.dir }} # generate output name dir by using inner step output
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - id: set-dirs # Give it an id to handle to get step outputs in the outputs key above
         run: echo "::set-output name=dir::$(ls -d */ | jq -R -s -c 'split("\n")[:-1]')"
         # Define step output named dir base on ls command transformed to JSON thanks to jq
@@ -103,21 +102,47 @@ #   - nightly
         exclude:
           - dir: scripts/
           - dir: curve-constraint-tests/
+          - dir: mnt4_753/
+          - dir: mnt6_753/
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Run tests
         run: |
           cd ${{matrix.dir}}
           cargo test --all-features
 
+  test-mnt4-753:
+    name: Test (mnt4_753/)
+    runs-on: macos-latest
+    needs: [directories] # Waits for the directory listing job
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Run tests
+        run: |
+          cd mnt4_753/
+          cargo test --all-features
+
+  test-mnt6-753:
+    name: Test (mnt6_753/)
+    runs-on: macos-latest
+    needs: [directories] # Waits for the directory listing job
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Run tests
+        run: |
+          cd mnt6_753/
+          cargo test --all-features
+
   docs:
     name: Check Documentation
     runs-on: ubuntu-latest
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
     - name: Install Rust
       uses: actions-rs/toolchain@v1
       with:
@@ -137,7 +162,7 @@ name: Check no_std
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Install Rust (${{ matrix.rust }})
         uses: actions-rs/toolchain@v1

@@ -17,9 +17,11 @@ - [\#124](https://github.com/arkworks-rs/curves/pull/124) Add the curve25519 curve.
 
 ### Improvements
 
+- [\#70](https://github.com/arkworks-rs/curves/pull/70) Add prepared G2 pairing consistency test. 
 - [\#74](https://github.com/arkworks-rs/curves/pull/74) Use Scott's subgroup membership tests for `G1` and `G2` of BLS12-381.
 - [\#103](https://github.com/arkworks-rs/curves/pull/103) Faster cofactor clearing for BLS12-381.
 - [\#107](https://github.com/arkworks-rs/curves/pull/107/) Use 2-NAF of `ATE_LOOP_COUNT` to speed up the Miller loop in MNT curves.
+
 
 ### Bug fixes
 

@@ -7,5 +7,7 @@
 #[test]
 fn test() {
     use crate::Bls12_377;
-    ark_curve_constraint_tests::pairing::bilinearity_test::<Bls12_377, PairingVar>().unwrap()
+    ark_curve_constraint_tests::pairing::bilinearity_test::<Bls12_377, PairingVar>().unwrap();
+    ark_curve_constraint_tests::pairing::g2_prepare_consistency_test::<Bls12_377, PairingVar>()
+        .unwrap();
 }

@@ -514,7 +514,7 @@
 pub mod pairing {
     use ark_ec::{
         pairing::{Pairing, PairingOutput},
-        CurveGroup,
+        AffineRepr, CurveGroup,
     };
     use ark_ff::{BitIteratorLE, Field, PrimeField};
     use ark_r1cs_std::prelude::*;
@@ -607,6 +607,40 @@ mode,
                     cs.which_is_unsatisfied().unwrap()
                 );
             }
+
+            assert!(cs.is_satisfied().unwrap(), "cs is not satisfied");
+        }
+        Ok(())
+    }
+
+    #[allow(dead_code)]
+    pub fn g2_prepare_consistency_test<E: Pairing, P: PairingVar<E>>() -> Result<(), SynthesisError>
+    {
+        let test_g2_elem = E::G2Affine::generator();
+        let test_g2_prepared = E::G2Prepared::from(test_g2_elem.clone());
+
+        let modes = [
+            AllocationMode::Input,
+            AllocationMode::Witness,
+            AllocationMode::Constant,
+        ];
+        for &mode in &modes {
+            let cs = ConstraintSystem::new_ref();
+
+            let test_g2_gadget =
+                P::G2Var::new_witness(cs.clone(), || Ok(test_g2_elem.clone())).unwrap();
+
+            let prepared_test_g2_gadget = P::prepare_g2(&test_g2_gadget).unwrap();
+            let allocated_test_g2_gadget =
+                P::G2PreparedVar::new_variable(cs.clone(), || Ok(test_g2_prepared.clone()), mode)
+                    .unwrap();
+
+            let prepared_test_g2_gadget_bytes = prepared_test_g2_gadget.to_bytes().unwrap();
+            let allocated_test_g2_gadget_bytes = allocated_test_g2_gadget.to_bytes().unwrap();
+
+            prepared_test_g2_gadget_bytes
+                .enforce_equal(&allocated_test_g2_gadget_bytes)
+                .unwrap();
 
             assert!(cs.is_satisfied().unwrap(), "cs is not satisfied");
         }

@@ -7,5 +7,7 @@
 #[test]
 fn test() {
     use crate::MNT4_298;
-    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT4_298, PairingVar>().unwrap()
+    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT4_298, PairingVar>().unwrap();
+    ark_curve_constraint_tests::pairing::g2_prepare_consistency_test::<MNT4_298, PairingVar>()
+        .unwrap();
 }

@@ -7,5 +7,7 @@
 #[test]
 fn test() {
     use crate::MNT4_753;
-    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT4_753, PairingVar>().unwrap()
+    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT4_753, PairingVar>().unwrap();
+    ark_curve_constraint_tests::pairing::g2_prepare_consistency_test::<MNT4_753, PairingVar>()
+        .unwrap();
 }

@@ -7,5 +7,7 @@
 #[test]
 fn test() {
     use crate::MNT6_298;
-    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT6_298, PairingVar>().unwrap()
+    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT6_298, PairingVar>().unwrap();
+    ark_curve_constraint_tests::pairing::g2_prepare_consistency_test::<MNT6_298, PairingVar>()
+        .unwrap();
 }

@@ -7,5 +7,7 @@
 #[test]
 fn test() {
     use crate::MNT6_753;
-    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT6_753, PairingVar>().unwrap()
+    ark_curve_constraint_tests::pairing::bilinearity_test::<MNT6_753, PairingVar>().unwrap();
+    ark_curve_constraint_tests::pairing::g2_prepare_consistency_test::<MNT6_753, PairingVar>()
+        .unwrap();
 }