diff --git a/src/bonsai/test/tool/test_polyline.py b/src/bonsai/test/tool/test_polyline.py
new file mode 100644
index 0000000000..ecaad033eb
--- /dev/null
+++ b/src/bonsai/test/tool/test_polyline.py
@@ -0,0 +1,48 @@
+# Bonsai - OpenBIM Blender Add-on
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of Bonsai.
+#
+# Bonsai is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Bonsai is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Bonsai.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import bpy
+import ifcopenshell
+import bonsai.core.tool
+import bonsai.tool as tool
+from test.bim.bootstrap import NewFile
+from bonsai.tool.polyline import Polyline as subject
+
+
+class TestImplementsTool(NewFile):
+    def test_run(self):
+        assert isinstance(subject(), bonsai.core.tool.Polyline)
+
+
+class TestValidateInput(NewFile):
+    def test_simple_units(self):
+        unit_settings = bpy.context.scene.unit_settings
+        unit_settings.system = "METRIC"
+        unit_settings.length_unit = "METERS"
+        assert subject.validate_input("25", "D") == (True, "25.0")
+        unit_settings.length_unit = "MILLIMETERS"
+        assert subject.validate_input("25", "D") == (True, "0.025")
+
+        unit_settings.system = "IMPERIAL"
+        assert subject.validate_input("25", "D") == (True, "7.62")
+        assert subject.validate_input("25'", "D") == (True, "7.62")
+        assert subject.validate_input('25"', "D") == (True, "0.635")
+
+        # Angle.
+        assert subject.validate_input("25", "A") == (True, "25.0")