Improve code for test coverage

app/Repositories/Account/AccountRepositoryInterface.php

@@ -62,13 +62,6 @@ interface AccountRepositoryInterface
      */
     public function find(int $accountId): Account;
 
-    /**
-     * @param int $accountId
-     *
-     * @return Account|null
-     */
-    public function findNull(int $accountId): ?Account;
-
     /**
      * @param string $number
      * @param array  $types
@@ -93,6 +86,13 @@ interface AccountRepositoryInterface
      */
     public function findByName(string $name, array $types): ?Account;
 
+    /**
+     * @param int $accountId
+     *
+     * @return Account|null
+     */
+    public function findNull(int $accountId): ?Account;
+
     /**
      * Return account type by string.
      *
@@ -135,6 +135,25 @@ interface AccountRepositoryInterface
      */
     public function getNote(Account $account): ?Note;
 
+    /**
+     * Returns the amount of the opening balance for this account.
+     *
+     * @param Account $account
+     *
+     * @return string
+     */
+    public function getOpeningBalanceAmount(Account $account): ?string;
+
+
+    /**
+     * Return date of opening balance as string or null.
+     *
+     * @param Account $account
+     *
+     * @return null|string
+     */
+    public function getOpeningBalanceDate(Account $account): ?string;
+
     /**
      * Find or create the opposing reconciliation account.
      *