[State Sync] Added unit tests for the bootstrapper.

Closes: aptos-labs#656

state-sync/state-sync-v2/state-sync-driver/Cargo.toml

@@ -35,6 +35,7 @@ storage-interface = { path = "../../../storage/storage-interface" }
 
 [dev-dependencies]
 anyhow = "1.0.52"
+async-trait = "0.1.42"
 bcs = "0.1.2"
 claim = "0.5.0"
 mockall = "0.11.0"
@@ -49,4 +50,5 @@ executor-test-helpers = { path = "../../../execution/executor-test-helpers" }
 move-core-types = { git = "https://github.com/move-language/move", rev = "1b6b7513dcc1a5c866f178ca5c1e74beb2ce181e", features=["address32"] }
 network = { path = "../../../network", features = ["fuzzing"] }
 storage-service-client = { path = "../../storage-service/client" }
+storage-service-types = { path = "../../storage-service/types" }
 vm-genesis = { path = "../../../aptos-move/vm-genesis", features = ["fuzzing"] }

state-sync/state-sync-v2/state-sync-driver/src/bootstrapper.rs

@@ -35,7 +35,7 @@ use storage_interface::DbReader;
 
 /// A simple container for verified epoch states and epoch ending ledger infos
 /// that have been fetched from the network.
-struct VerifiedEpochStates {
+pub(crate) struct VerifiedEpochStates {
     // If new epoch ending ledger infos have been fetched from the network
     fetched_epoch_ending_ledger_infos: bool,
 
@@ -1296,4 +1296,10 @@ impl<
         self.speculative_stream_state = None;
         self.active_data_stream = None;
     }
+
+    /// Returns the verified epoch states struct for testing purposes.
+    #[cfg(test)]
+    pub(crate) fn get_verified_epoch_states(&mut self) -> &mut VerifiedEpochStates {
+        &mut self.verified_epoch_states
+    }
 }