implement BlockCache trait for MockBlockSource

zcash_client_backend/src/data_api/chain.rs

@@ -709,9 +709,9 @@ pub mod testing {
     use std::convert::Infallible;
     use zcash_primitives::consensus::BlockHeight;
 
-    use crate::proto::compact_formats::CompactBlock;
+    use crate::{data_api::scanning::ScanRange, proto::compact_formats::CompactBlock};
 
-    use super::{error::Error, BlockSource};
+    use super::{error::Error, BlockCache, BlockSource};
 
     pub struct MockBlockSource;
 
@@ -730,4 +730,34 @@ pub mod testing {
             Ok(())
         }
     }
+
+    impl BlockCache for MockBlockSource {
+        async fn get_tip_height<WalletErrT>(
+            &self,
+            _range: Option<&ScanRange>,
+        ) -> Result<Option<BlockHeight>, Error<WalletErrT, Self::Error>> {
+            Ok(None)
+        }
+
+        async fn read<WalletErrT>(
+            &self,
+            _range: &ScanRange,
+        ) -> Result<Vec<CompactBlock>, Error<WalletErrT, Self::Error>> {
+            Ok(Vec::new())
+        }
+
+        async fn insert<WalletErrT>(
+            &self,
+            _compact_blocks: Vec<CompactBlock>,
+        ) -> Result<(), Error<WalletErrT, Self::Error>> {
+            Ok(())
+        }
+
+        async fn delete<WalletErrT>(
+            &self,
+            _range: ScanRange,
+        ) -> Result<(), Error<WalletErrT, Self::Error>> {
+            Ok(())
+        }
+    }
 }