diff --git a/tests/data/models/model-BTOXSGAMMA.dec b/tests/data/models/model-BTOXSGAMMA.dec
new file mode 100644
index 00000000..10677cd8
--- /dev/null
+++ b/tests/data/models/model-BTOXSGAMMA.dec
@@ -0,0 +1,7 @@
+# File for testing purposes. Contains a single decay mode with a specific model.
+
+Decay B+
+0.0003118  Xsu  gamma  BTOXSGAMMA  2;
+Enddecay
+
+End
diff --git a/tests/data/models/model-BTOXSLL.dec b/tests/data/models/model-BTOXSLL.dec
new file mode 100644
index 00000000..be94f1f6
--- /dev/null
+++ b/tests/data/models/model-BTOXSLL.dec
@@ -0,0 +1,7 @@
+# File for testing purposes. Contains a single decay mode with a specific model.
+
+Decay B+
+  0.0000025  Xsu  mu+  mu-  PHOTOS  BTOXSLL  4.8  0.2  0.0  0.41;
+Enddecay
+
+End
diff --git a/tests/dec/test_known_decay_models.py b/tests/dec/test_known_decay_models.py
index 8786e9fa..ff3f0aa9 100644
--- a/tests/dec/test_known_decay_models.py
+++ b/tests/dec/test_known_decay_models.py
@@ -37,13 +37,13 @@ def test_lark_file_model_list_consistency():
 # TODO: actually test all models - takes time
 parsed_models = (
     ("BaryonPCR", [1.0, 1.0, 1.0, 1.0]),
-    ("BC_SMN", ""),
-    ("BC_TMN", ""),
-    ("BC_VHAD", ""),
-    ("BC_VMN", ""),
-    ("BCL", ""),
-    ("BGL", ""),
-    ("BLLNUL", ""),
+    ("BC_SMN", ""),  # No dec file found in EvtGen repository
+    ("BC_TMN", ""),  # No dec file found in EvtGen repository
+    ("BC_VHAD", ""),  # No dec file found in EvtGen repository
+    ("BC_VMN", ""),  # No dec file found in EvtGen repository
+    ("BCL", ""),  # No dec file found in EvtGen repository
+    ("BGL", ""),  # No dec file found in EvtGen repository
+    ("BLLNUL", ""),  # No dec file found in EvtGen repository
     ("BNOCB0TO4PICP", ""),
     ("BNOCBPTO3HPI0", ""),
     ("BNOCBPTOKSHHH", ""),
@@ -59,9 +59,9 @@ def test_lark_file_model_list_consistency():
     ("BTOSLLMS", ""),
     ("BTOSLLMSEXT", ""),
     ("BTOVLNUBALL", ""),
-    ("BTOXSGAMMA", ""),
+    ("BTOXSGAMMA", [2.0]),
     ("BTOXELNU", ""),
-    ("BTOXSLL", ""),
+    ("BTOXSLL", [4.8, 0.2, 0.0, 0.41]),
     ("BQTOLLLLHYPERCP", ""),
     ("BQTOLLLL", ""),
     ("CB3PI-MPP", ""),
@@ -169,7 +169,15 @@ def test_model_parsing(decay_model: str, expected_model_parameters: str):
     are parsed with no errors but, most importantly, correctly.
     """
     # TODO: actually test all models - takes time
-    if decay_model not in {"BaryonPCR", "GOITY_ROBERTS", "LNUGAMMA", "PHSP", "SSD_CP"}:
+    if decay_model not in {
+        "BaryonPCR",
+        "BTOXSGAMMA",
+        "BTOXSLL",
+        "GOITY_ROBERTS",
+        "LNUGAMMA",
+        "PHSP",
+        "SSD_CP",
+    }:
         pass
     else:
         dfp = DecFileParser(DIR / f"../data/models/model-{decay_model}.dec")