diff --git a/pyproject.toml b/pyproject.toml
index 38cae47..38a8f03 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "oslg"
-version = "0.3.0"
+version = "0.3.1"
 description = "OpenStudio SDK logger for Python"
 readme = "README.md"
 requires-python = ">=3.2"
diff --git a/src/oslg/oslg.py b/src/oslg/oslg.py
index 333ddbf..e86c0e2 100644
--- a/src/oslg/oslg.py
+++ b/src/oslg/oslg.py
@@ -132,7 +132,7 @@ def is_info() -> bool:
 
 def is_warn() -> bool:
     """Returns whether current status is WARNING."""
-    return bool(_status == CN.WARNING)
+    return bool(_status == CN.WARN)
 
 
 def is_error() -> bool:
diff --git a/tests/test_oslg.py b/tests/test_oslg.py
index 5465ba5..bb5ca14 100644
--- a/tests/test_oslg.py
+++ b/tests/test_oslg.py
@@ -39,6 +39,10 @@
 class TestOSlgModuleMethods(unittest.TestCase):
     def test_oslg_constants(self):
         self.assertEqual(DBG, 1)
+        self.assertEqual(INF, 2)
+        self.assertEqual(WRN, 3)
+        self.assertEqual(ERR, 4)
+        self.assertEqual(FTL, 5)
 
     def test01_oslg_initialized(self):
         self.assertEqual(len(oslg.logs()), 0)
@@ -83,14 +87,14 @@ def test03_oslg_invalid_argument_log(self):
         self.assertEqual(oslg.reset(INF), INF)
         self.assertEqual(oslg.clean(), INF)
         self.assertEqual(oslg.level(), INF)
-        self.assertEqual(oslg.invalid("radius", "area", 0, FTL), None)
-        self.assertFalse(oslg.is_info())
-        self.assertTrue(oslg.is_fatal())
-        self.assertEqual(oslg.status(), FTL)
+        self.assertEqual(oslg.invalid("radius", "area", 0, WRN), None)
+        self.assertFalse(oslg.is_fatal())
+        self.assertTrue(oslg.is_warn())
+        self.assertEqual(oslg.status(), WRN)
         self.assertEqual(oslg.level(), INF)
         self.assertEqual(len(oslg.logs()), 1)
         self.assertEqual(oslg.logs()[0]["message"], m2)
-        self.assertEqual(oslg.logs()[0]["level"], FTL)
+        self.assertEqual(oslg.logs()[0]["level"], WRN)
         self.assertEqual(oslg.reset(INF), INF)
         self.assertEqual(oslg.clean(), INF)
         self.assertEqual(oslg.level(), INF)