Add function to generate "keys" for test results.

- As the keys are to be used for dict-based lookup (in a template) then they cannot contains spaces.
- May as well enforce lower-case encoding!

InvenTree/stock/models.py

@@ -962,7 +962,8 @@ class StockItem(MPTTModel):
         result_map = {}
 
         for result in results:
-            result_map[result.test] = result
+            key = helpers.generateTestKey(result.test) 
+            result_map[key] = result
 
         return result_map
 

InvenTree/stock/tests.py

@@ -429,5 +429,6 @@ class TestResultTest(StockTest):
 
         self.assertEqual(len(result_map), 3)
 
-        for test in ['Firmware Version', 'Settings Checksum', 'Temperature Test']:
+        # Keys are all lower-case and do not contain spaces
+        for test in ['firmwareversion', 'settingschecksum', 'temperaturetest']:
             self.assertIn(test, result_map.keys())