Organize tools and move Python tests into tools/tests

tools/tests/test_npc_proportions.py

@@ -0,0 +1,22 @@
+import unittest
+
+import npc_proportions
+
+
+class NpcProportionTests(unittest.TestCase):
+    def test_every_library_character_is_measured(self):
+        rows = npc_proportions.report()
+        self.assertEqual(len(rows), 8)
+        self.assertEqual(len({row["character"] for row in rows}), 8)
+        for row in rows:
+            self.assertGreater(row["measurements"]["height"], 1.6)
+
+    def test_current_library_stays_inside_the_stylized_guide(self):
+        for row in npc_proportions.report():
+            for key, check in row["checks"].items():
+                self.assertEqual(check["status"], "ok",
+                                 f"{row['character']} {key}={check['value']}")
+
+
+if __name__ == "__main__":
+    unittest.main()