From 3cc54462bd4e322d504d02af0f21f39e274815ce Mon Sep 17 00:00:00 2001
From: Roman Mogylatov <rmogilatov@gmail.com>
Date: Mon, 20 Dec 2021 19:15:19 +0200
Subject: [PATCH] Add tests for an empty environment variable

---
 tests/unit/providers/configuration/conftest.py       |  2 ++
 .../providers/configuration/test_from_env_py2_py3.py | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/tests/unit/providers/configuration/conftest.py b/tests/unit/providers/configuration/conftest.py
index 9f473790..ee99fd3a 100644
--- a/tests/unit/providers/configuration/conftest.py
+++ b/tests/unit/providers/configuration/conftest.py
@@ -106,9 +106,11 @@ def environment_variables():
     os.environ["CONFIG_TEST_ENV"] = "test-value"
     os.environ["CONFIG_TEST_PATH"] = "test-path"
     os.environ["DEFINED"] = "defined"
+    os.environ["EMPTY"] = ""
     os.environ["CONFIG_INT"] = "42"
     yield
     os.environ.pop("CONFIG_TEST_ENV", None)
     os.environ.pop("CONFIG_TEST_PATH", None)
     os.environ.pop("DEFINED", None)
+    os.environ.pop("EMPTY", None)
     os.environ.pop("CONFIG_INT", None)
diff --git a/tests/unit/providers/configuration/test_from_env_py2_py3.py b/tests/unit/providers/configuration/test_from_env_py2_py3.py
index 24c4e914..a65d5c95 100644
--- a/tests/unit/providers/configuration/test_from_env_py2_py3.py
+++ b/tests/unit/providers/configuration/test_from_env_py2_py3.py
@@ -49,6 +49,12 @@ def test_as__undefined_required(config):
     assert config() == {}
 
 
+def test_as__defined_empty(config):
+    with raises(ValueError):
+        config.from_env("EMPTY", as_=int)
+    assert config() == {}
+
+
 def test_option_as_(config):
     config.option.from_env("CONFIG_INT", as_=int)
     assert config.option() == 42
@@ -67,6 +73,12 @@ def test_option_as__undefined_required(config):
     assert config.option() is None
 
 
+def test_option_as__defined_empty(config):
+    with raises(ValueError):
+        config.option.from_env("EMPTY", as_=int)
+    assert config.option() is None
+
+
 @mark.parametrize("config_type", ["strict"])
 def test_undefined_in_strict_mode(config):
     with raises(ValueError):