Add SourceLocation.__eq__ to make it comparable to the formatted form

Author: ktosiek

src/graphql/language/location.py

@@ -16,6 +16,16 @@ class SourceLocation(NamedTuple):
     def formatted(self):
         return dict(line=self.line, column=self.column)
 
+    def __eq__(self, other):
+        if isinstance(other, dict):
+            return other == self.formatted
+        return super().__eq__(other)
+
+    def __ne__(self, other):
+        if isinstance(other, dict):
+            return other != self.formatted
+        return super().__ne__(other)
+
 
 def get_location(source: "Source", position: int) -> SourceLocation:
     """Get the line and column for a character position in the source.

tests/error/test_format_error.py

@@ -31,6 +31,7 @@ def format_graphql_error():
             extensions=extensions,
         )
         formatted = format_error(error)
+        assert error == formatted
         assert formatted == {
             "message": "test message",
             "locations": [{"line": 2, "column": 14}, {"line": 3, "column": 20}],