diff --git a/tests/test_debug_flag.py b/tests/test_debug_flag.py
new file mode 100644
index 0000000..4c97289
--- /dev/null
+++ b/tests/test_debug_flag.py
@@ -0,0 +1,26 @@
+import os
+
+import importlib
+
+
+def test_get_debug_trajectories_enabled_various_values():
+    # Import under test
+    import explorer
+
+    # Ensure default (unset) is False
+    os.environ.pop("EXPLORER_DEBUG_TRAJECTORIES", None)
+    assert explorer.get_debug_trajectories_enabled() is False
+
+    # Truthy values
+    for val in ("1", "true", "True"):
+        os.environ["EXPLORER_DEBUG_TRAJECTORIES"] = val
+        # reload not required as function reads env at call time
+        assert explorer.get_debug_trajectories_enabled() is True
+
+    # Falsy / unexpected values
+    for val in ("0", "false", "False", "yes", "random"):
+        os.environ["EXPLORER_DEBUG_TRAJECTORIES"] = val
+        assert explorer.get_debug_trajectories_enabled() is False
+
+    # Cleanup
+    os.environ.pop("EXPLORER_DEBUG_TRAJECTORIES", None)