refactor(starknet_api): change default sierra contract class to valid…

… one

crates/starknet_api/src/state.rs

@@ -209,14 +209,25 @@ impl StorageKey {
 impl_from_through_intermediate!(u128, StorageKey, u8, u16, u32, u64);
 
 /// A contract class.
-#[derive(Debug, Clone, Default, Eq, PartialEq, Deserialize, Serialize, Hash)]
+#[derive(Debug, Clone, Eq, PartialEq, Deserialize, Serialize, Hash)]
 pub struct SierraContractClass {
     pub sierra_program: Vec<Felt>,
     pub contract_class_version: String,
     pub entry_points_by_type: EntryPointByType,
     pub abi: String,
 }
 
+impl Default for SierraContractClass {
+    fn default() -> Self {
+        Self {
+            sierra_program: [Felt::ONE, Felt::TWO, Felt::THREE].to_vec(),
+            contract_class_version: Default::default(),
+            entry_points_by_type: Default::default(),
+            abi: Default::default(),
+        }
+    }
+}
+
 /// An entry point of a [ContractClass](`crate::state::ContractClass`).
 #[derive(Debug, Default, Clone, Eq, PartialEq, Hash, Deserialize, Serialize, PartialOrd, Ord)]
 pub struct EntryPoint {