add eq & partial_eq for RecursivePod, Pod traits and VDSet struct (for usage from introduction-pods) (#309)

* add eq & partial_eq for VDSet (for usage from introduction-pods)

* add eq & partial_eq impls for Pod & RecursivePod traits

src/backends/plonky2/mock/emptypod.rs

@@ -1,3 +1,5 @@
+use std::any::Any;
+
 use itertools::Itertools;
 
 use crate::{
@@ -12,7 +14,7 @@ use crate::{
     },
 };
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct MockEmptyPod {
     params: Params,
     id: PodId,
@@ -67,6 +69,17 @@ impl Pod for MockEmptyPod {
     fn serialize_data(&self) -> serde_json::Value {
         serde_json::Value::Null
     }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn equals(&self, other: &dyn Pod) -> bool {
+        if let Some(other) = other.as_any().downcast_ref::<MockEmptyPod>() {
+            self == other
+        } else {
+            false
+        }
+    }
 }
 
 impl RecursivePod for MockEmptyPod {

src/backends/plonky2/mock/mainpod.rs

@@ -2,7 +2,7 @@
 // MainPod
 //
 
-use std::{fmt, iter};
+use std::{any::Any, fmt, iter};
 
 use itertools::Itertools;
 use serde::{Deserialize, Serialize};
@@ -56,6 +56,21 @@ pub struct MockMainPod {
     merkle_proofs_containers: Vec<MerkleClaimAndProof>,
 }
 
+impl PartialEq for MockMainPod {
+    fn eq(&self, other: &Self) -> bool {
+        self.params == other.params
+            && self.id == other.id
+            && self.vd_set == other.vd_set
+            && self.input_signed_pods == other.input_signed_pods
+            && self.input_recursive_pods == other.input_recursive_pods
+            && self.statements == other.statements
+            && self.operations == other.operations
+            && self.public_statements == other.public_statements
+            && self.merkle_proofs_containers == other.merkle_proofs_containers
+    }
+}
+impl Eq for MockMainPod {}
+
 impl fmt::Display for MockMainPod {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         writeln!(f, "MockMainPod ({}):", self.id)?;
@@ -365,6 +380,17 @@ impl Pod for MockMainPod {
         })
         .expect("serialization to json")
     }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn equals(&self, other: &dyn Pod) -> bool {
+        if let Some(other) = other.as_any().downcast_ref::<MockMainPod>() {
+            self == other
+        } else {
+            false
+        }
+    }
 }
 
 impl RecursivePod for MockMainPod {

src/backends/plonky2/mock/signedpod.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::{any::Any, collections::HashMap};
 
 use itertools::Itertools;
 use serde::{Deserialize, Serialize};
@@ -45,7 +45,7 @@ impl PodSigner for MockSigner {
     }
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct MockSignedPod {
     id: PodId,
     signature: String,
@@ -158,6 +158,17 @@ impl Pod for MockSignedPod {
         })
         .expect("serialization to json")
     }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn equals(&self, other: &dyn Pod) -> bool {
+        if let Some(other) = other.as_any().downcast_ref::<MockSignedPod>() {
+            self == other
+        } else {
+            false
+        }
+    }
 }
 
 #[cfg(test)]