diff --git a/tests/typing/configuration.py b/tests/typing/configuration.py
index b6005004..4a4c7f95 100644
--- a/tests/typing/configuration.py
+++ b/tests/typing/configuration.py
@@ -14,7 +14,11 @@ config2.from_ini(Path("config.ini"))
 
 config2.from_yaml("config.yml")
 config2.from_yaml(Path("config.yml"))
+
 config2.from_env("ENV", "default")
+config2.from_env("ENV", as_=int, default=123)
+config2.from_env("ENV", as_=float, required=True)
+config2.from_env("ENV", as_=lambda env: str(env))
 
 # Test 3: to check as_*() methods
 config3 = providers.Configuration()