diff --git a/tests/common/general_maths/test_arithmetic_conversions.py b/tests/common/general_maths/test_arithmetic_conversions.py
index 6a69519692..ffba7d18e7 100644
--- a/tests/common/general_maths/test_arithmetic_conversions.py
+++ b/tests/common/general_maths/test_arithmetic_conversions.py
@@ -56,6 +56,27 @@ def test_conversion_from_microns_to_centimetres(input, result):
     assert convert_microns_to_cm(input) == pytest.approx(result)
 
 
+# Circular tests (all numbers here arbitrary)
+
+
+@pytest.mark.parametrize("input", [1.0, 10.0, 100.0])
+def test_circular_cm_to_mm_and_back(input):
+    assert convert_cm_to_mm(convert_mm_to_cm(input)) == input
+    assert convert_mm_to_cm(convert_cm_to_mm(input)) == input
+
+
+@pytest.mark.parametrize("input", [1.0, 10.0, 100.0])
+def test_circular_microns_to_mm_and_back(input):
+    assert convert_microns_to_mm(convert_mm_to_microns(input)) == input
+    assert convert_mm_to_microns(convert_microns_to_mm(input)) == input
+
+
+@pytest.mark.parametrize("input", [1.0, 10.0, 100.0])
+def test_circular_percentage_to_factor(input):
+    assert convert_percentage_to_factor(convert_factor_to_percentage(input)) == input
+    assert convert_factor_to_percentage(convert_percentage_to_factor(input)) == input
+
+
 # The inauspicuous path
 @pytest.mark.parametrize(
     "bad_input",
diff --git a/tests/common/general_maths/test_check_bounds.py b/tests/common/general_maths/test_check_bounds.py
index 2ce0dc7042..1633b19ff6 100644
--- a/tests/common/general_maths/test_check_bounds.py
+++ b/tests/common/general_maths/test_check_bounds.py
@@ -48,12 +48,7 @@ def test_has_misordered_inputs():
 @pytest.mark.parametrize(
     "bad_input",
     [
-        (
-            "a",
-            None,
-            math.sin,
-            object(),
-        ),
+        ("a", None, math.sin, object(), False),
     ],
 )
 def test_is_within_range_raises_error_with_bad_tested_value(
@@ -66,12 +61,7 @@ def test_is_within_range_raises_error_with_bad_tested_value(
 @pytest.mark.parametrize(
     "bad_input",
     [
-        (
-            "a",
-            None,
-            math.sin,
-            object(),
-        ),
+        ("a", None, math.sin, object(), False),
     ],
 )
 def test_is_within_range_raises_error_with_bad_upper_bound(
@@ -84,12 +74,7 @@ def test_is_within_range_raises_error_with_bad_upper_bound(
 @pytest.mark.parametrize(
     "bad_input",
     [
-        (
-            "a",
-            None,
-            math.sin,
-            object(),
-        ),
+        ("a", None, math.sin, object(), False),
     ],
 )
 def test_is_within_range_raises_error_with_bad_lower_bound(
diff --git a/tests/common/general_maths/test_transmission_interconversion.py b/tests/common/general_maths/test_transmission_interconversion.py
index db3fa31293..40622d9c48 100644
--- a/tests/common/general_maths/test_transmission_interconversion.py
+++ b/tests/common/general_maths/test_transmission_interconversion.py
@@ -98,6 +98,35 @@ def test_attenuation_from_natural_log_of_transmission(ln_t, result):
     assert attenuation_from_natural_log_of_transmission(ln_t) == pytest.approx(result)
 
 
+# Circular tests (all numbers here arbitrary)
+
+
+@pytest.mark.parametrize("input", [1.0, 10.0, 100.0])
+def test_circular_attenuation_from_log_and_back(input):
+    assert (
+        attenuation_from_natural_log_of_transmission(
+            natural_log_of_transmission_from_attenuation(input)
+        )
+        == input
+    )
+    assert (
+        natural_log_of_transmission_from_attenuation(
+            attenuation_from_natural_log_of_transmission(input)
+        )
+        == input
+    )
+
+
+@pytest.mark.parametrize("input", [1.0, 10.0, 100.0])
+def test_circular_attenuation_from_transmission_and_back(input):
+    assert attenuation_from_transmission(
+        transmission_from_attenutation(input)
+    ) == pytest.approx(input)
+    assert transmission_from_attenutation(
+        attenuation_from_transmission(input)
+    ) == pytest.approx(input)
+
+
 # inauspicious:
 @pytest.mark.parametrize("bad_input", ["a", [], None, math.sin, object(), False])
 def test_natural_log_of_transmission_from_attenuation_raises_error(bad_input):