diff --git a/tests/unit/canopy_model/test_canopy.py b/tests/unit/canopy_model/test_canopy.py
new file mode 100644
index 00000000..98e6d1be
--- /dev/null
+++ b/tests/unit/canopy_model/test_canopy.py
@@ -0,0 +1 @@
+"""test the canopy object in canopy.py initialises as expected."""
diff --git a/tests/unit/canopy_model/test_canopy_functions.py b/tests/unit/canopy_model/test_canopy_functions.py
new file mode 100644
index 00000000..dd3be6ef
--- /dev/null
+++ b/tests/unit/canopy_model/test_canopy_functions.py
@@ -0,0 +1 @@
+"""test the functions in canopy_functions.py."""
diff --git a/tests/unit/canopy_model/test_community.py b/tests/unit/canopy_model/test_community.py
new file mode 100644
index 00000000..07e8eb35
--- /dev/null
+++ b/tests/unit/canopy_model/test_community.py
@@ -0,0 +1 @@
+"""test the community object in community.py initialises as expected."""
diff --git a/tests/unit/canopy_model/test_jaideeps_t_model_extension.py b/tests/unit/canopy_model/test_jaideeps_t_model_extension_functions.py
similarity index 50%
rename from tests/unit/canopy_model/test_jaideeps_t_model_extension.py
rename to tests/unit/canopy_model/test_jaideeps_t_model_extension_functions.py
index d743e90f..e1d4179c 100644
--- a/tests/unit/canopy_model/test_jaideeps_t_model_extension.py
+++ b/tests/unit/canopy_model/test_jaideeps_t_model_extension_functions.py
@@ -1,10 +1,19 @@
+"""Test the functions in jaideeps_t_model_extension_functions.py."""
+
 import numpy as np
 from numpy.testing import assert_array_equal
 
-from pyrealm.canopy_model.functions.jaideep_t_model_extension_functions import *
+from pyrealm.canopy_model.functions.jaideep_t_model_extension_functions import (
+    calculate_q_m_values,
+)
 
 
 def test_calculate_q_m_values_returns_q_m_for_valid_input():
+    """Test happy path for calculating q_m.
+
+    test that values of q_m are calculated correctly when valid arguments are
+    provided to the function.
+    """
     m_values = np.array([2, 3])
     n_values = np.array([5, 4])
     expected_q_m_values = np.array([2.9038988210485766, 2.3953681843215673])
@@ -13,20 +22,31 @@ def test_calculate_q_m_values_returns_q_m_for_valid_input():
 
 
 def test_calculate_q_m_values_raises_exception_for_invalid_input():
+    """Test unhappy path for calculating q_m.
+
+    Test that an exception is raised when invalid arguments are provided to the
+    function.
+    """
+
     pass
 
 
-def test_calculate_z_m_values():
+def test_calculate_z_max_values():
+    """Test happy path for calculating z_max."""
+
     pass
 
 
 def test_calculate_r_0_values():
+    """Test happy path for calculating r_0."""
     pass
 
 
 def test_calculate_projected_canopy_area_for_individuals():
+    """Test happy path for calculating canopy area for individuals."""
     pass
 
 
 def test_calculate_relative_canopy_radii():
+    """Test happy path for calculating relative canopy radii for individuals."""
     pass
diff --git a/tests/unit/tmodel/test_t_model_functions.py b/tests/unit/tmodel/test_t_model_functions.py
new file mode 100644
index 00000000..54a5c41e
--- /dev/null
+++ b/tests/unit/tmodel/test_t_model_functions.py
@@ -0,0 +1 @@
+"""test the functions in t_model_functions.py."""