Add a migration test for the `ephemeral_addresses` migration.

Signed-off-by: Daira-Emma Hopwood <daira@jacaranda.org>

zcash_client_sqlite/src/wallet/init/migrations/ephemeral_addresses.rs

@@ -55,3 +55,13 @@ impl RusqliteMigration for Migration {
         Err(WalletMigrationError::CannotRevert(MIGRATION_ID))
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::wallet::init::migrations::tests::test_migrate;
+
+    #[test]
+    fn migrate() {
+        test_migrate(&[super::MIGRATION_ID]);
+    }
+}