fix(tokens-repo): fix is_name_exists() being fallible

selfprivacy_api/repositories/tokens/abstract_tokens_repository.py

@@ -70,10 +70,7 @@ class AbstractTokensRepository(ABC):
 
     def is_token_name_exists(self, token_name: str) -> bool:
         """Check if the token name exists"""
-        token = self.get_token_by_name(token_name)
-        if token is None:
-            return False
-        return True
+        return token_name in [token.device_name for token in self.get_tokens()]
 
     def is_token_name_pair_valid(self, token_name: str, token_string: str) -> bool:
         """Check if the token name and token are valid"""

tests/test_graphql/test_repository/test_tokens_repository.py

@@ -215,6 +215,13 @@ def test_is_token_name_pair_valid(some_tokens_repo):
     assert not repo.is_token_name_pair_valid("gibberish", token.token)
 
 
+def test_is_token_name_exists(some_tokens_repo):
+    repo = some_tokens_repo
+    token = repo.get_tokens()[0]
+    assert repo.is_token_name_exists(token.device_name)
+    assert not repo.is_token_name_exists("gibberish")
+
+
 def test_get_tokens(some_tokens_repo):
     repo = some_tokens_repo
     tokenstrings = []