Assert we migrated all exactly all keys

Previously, we'd only check that the number of migrated keys and that
the migrated data is correct. Here, we also check that all the
Previously-written keys are migrated as expected.

Author: tnull

lightning-persister/src/test_utils.rs

@@ -10,6 +10,7 @@ use lightning::util::persist::{
 use lightning::util::test_utils;
 use lightning::{check_added_monitors, check_closed_broadcast, check_closed_event};
 
+use std::collections::HashSet;
 use std::panic::RefUnwindSafe;
 
 pub(crate) fn do_read_write_remove_list_persist<K: KVStore + RefUnwindSafe>(kv_store: &K) {
@@ -70,6 +71,7 @@ pub(crate) fn do_test_data_migration<S: MigratableKVStore, T: MigratableKVStore>
 	let num_primary_namespaces = 2;
 	let num_secondary_namespaces = 2;
 	let num_keys = 3;
+	let mut stored_keys = HashSet::new();
 	for i in 0..num_primary_namespaces {
 		let primary_namespace =
 			format!("testspace{}", KVSTORE_NAMESPACE_KEY_ALPHABET.chars().nth(i).unwrap());
@@ -79,6 +81,11 @@ pub(crate) fn do_test_data_migration<S: MigratableKVStore, T: MigratableKVStore>
 			for k in 0..num_keys {
 				let key =
 					format!("testkey{}", KVSTORE_NAMESPACE_KEY_ALPHABET.chars().nth(k).unwrap());
+				stored_keys.insert((
+					primary_namespace.clone(),
+					secondary_namespace.clone(),
+					key.clone(),
+				));
 				source_store
 					.write(&primary_namespace, &secondary_namespace, &key, &dummy_data)
 					.unwrap();
@@ -92,9 +99,11 @@ pub(crate) fn do_test_data_migration<S: MigratableKVStore, T: MigratableKVStore>
 	migrate_kv_store_data(source_store, target_store).unwrap();
 
 	assert_eq!(target_store.list_all_keys().unwrap().len(), total_num_entries);
-	for (p, s, k) in &all_keys {
-		assert_eq!(target_store.read(p, s, k).unwrap(), dummy_data);
+	for (p, s, k) in all_keys {
+		assert_eq!(target_store.read(&p, &s, &k).unwrap(), dummy_data);
+		assert!(stored_keys.remove(&(p, s, k)));
 	}
+	assert!(stored_keys.is_empty());
 }
 
 // Integration-test the given KVStore implementation. Test relaying a few payments and check that