Add check for zero denominator in approx (#10624)

Closes #10533
2023-01-24 15:37:42 +05:30
parent 05eee78aaa
commit ca40380e99
3 changed files with 24 additions and 4 deletions
--- a/src/_pytest/python_api.py
+++ b/src/_pytest/python_api.py
@@ -269,10 +269,16 @@ class ApproxMapping(ApproxBase):
                max_abs_diff = max(
                    max_abs_diff, abs(approx_value.expected - other_value)
                )
-                max_rel_diff = max(
-                    max_rel_diff,
-                    abs((approx_value.expected - other_value) / approx_value.expected),
-                )
+                if approx_value.expected == 0.0:
+                    max_rel_diff = math.inf
+                else:
+                    max_rel_diff = max(
+                        max_rel_diff,
+                        abs(
+                            (approx_value.expected - other_value)
+                            / approx_value.expected
+                        ),
+                    )
                different_ids.append(approx_key)

        message_data = [