Fix version, add very basic test

pyproject.toml

@@ -7,7 +7,7 @@ license = { text = "MIT License" }
 authors = [{ name = "phil", email = "phil.dev@philome.mooo.com" }]
 requires-python = ">=3.13"
 dependencies = [
-  "aiosmtplib>=3.0.2",
+  "aiosmtplib>=4.0.1",
   "dateutils>=0.6.12",
   "pydantic-settings[yaml]>=2.6.1",
   "pydantic[email]>=2.10.3",
@@ -29,7 +29,13 @@ Issues = "https://code.philo.ydns.eu/philorg/tinysteady-mailer/issues"
 tinysteady-mailer = "tinysteady_mailer:main"
 
 [dependency-groups]
-dev = ["dunamai>=1.23.0", "ipdb>=0.13.13", "ipython>=8.30.0"]
+dev = [
+    "dunamai>=1.24.0",
+ "ipdb>=0.13.13",
+ "ipython>=9.3.0",
+ "pytest>=8.4.1",
+ "pytest-asyncio>=1.0.0",
+]
 
 [build-system]
 requires = ["hatchling", "uv-dynamic-versioning"]