Add pytest_assertrepr_compare hook to show detailed assert failures

Author: JoshData

Makefile

@@ -17,7 +17,7 @@ typing:
 
 .PHONY: test
 test:
-	PYTHONPATH=.:$$PYTHONPATH pytest --cov=email_validator -k "not network"
+	PYTHONPATH=.:$$PYTHONPATH pytest --cov=email_validator -k "not network" -vv
 
 .PHONY: testcov
 testcov: test

tests/conftest.py

@@ -0,0 +1,17 @@
+from email_validator import ValidatedEmail
+
+
+def pytest_assertrepr_compare(config, op, left, right):
+    if isinstance(left, ValidatedEmail) and isinstance(right, ValidatedEmail) and op == "==":
+        leftDict = left.as_dict()
+        rightDict = right.as_dict()
+        keys = set(leftDict) | set(rightDict)
+        table = [ [key, leftDict.get(key), rightDict.get(key)]
+                  for key in keys ]
+        maxLen = [max(len(repr(row[col])) for row in table) for col in (0, 1, 2)]
+        return [repr(left) + " != " + repr(right)] \
+               + [(t[0].rjust(maxLen[0])
+                   + " " + repr(t[1]).ljust(maxLen[1])
+                   + (" ==" if t[1] == t[2] else " !=")
+                   + " " + repr(t[2]).ljust(maxLen[2]))
+               for t in table]