full_flow_tests.py: relax verification of sensitivity.png

tests/full_flow_tests.py

@@ -102,10 +102,13 @@ def collateral_checker(log, run_dir, *collateral_list):
         0: file name
         1: expected file size
     """
+    def relaxed_size_equal(a, b, relaxation):
+        return True if abs(a-b) <= relaxation else False
+
     for collateral in collateral_list:
         file_path = os.path.join(run_dir, collateral[0])
         statinfo = os.stat(file_path)
-        if statinfo.st_size != collateral[1]:
+        if not relaxed_size_equal(statinfo.st_size, collateral[1], 2):
             return False
     return True