diff --git a/tests/test_obssys_state_transitions.py b/tests/test_obssys_state_transitions.py
index 4264c17b..970c217b 100644
--- a/tests/test_obssys_state_transitions.py
+++ b/tests/test_obssys_state_transitions.py
@@ -21,6 +21,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+import sys
 import unittest
 
 import yaml
@@ -52,8 +53,12 @@ async def test_obssys_standby_disabled(self) -> None:
         module.
 
         """
+        # Mock the command-line arguments that the obssys_standby_disabled.py
+        # script expects.
+        test_env = "tts"
+        sys.argv[1:] = [test_env]
         # Instantiate the ObsSysStandbyDisabled integration tests.
-        script_class = ObsSysStandbyDisabled(test_env="tts")
+        script_class = ObsSysStandbyDisabled(test_env=test_env)
         # Get number of scripts and the configuration.
         num_scripts = len(script_class.scripts)
         script_config = yaml.safe_load(script_class.configs[0])
@@ -73,8 +78,12 @@ async def test_obssys_disabled_enabled(self) -> None:
         module.
 
         """
+        # Mock the command-line arguments that the obssys_disabled_enabled.py
+        # script expects.
+        test_env = "bts"
+        sys.argv[1:] = [test_env]
         # Instantiate the ObsSysDisabledEnabled integration tests.
-        script_class = ObsSysDisabledEnabled(test_env="bts")
+        script_class = ObsSysDisabledEnabled(test_env=test_env)
         # Get number of scripts and the configuration.
         num_scripts = len(script_class.scripts)
         script_config = yaml.safe_load(script_class.configs[0])