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

Author: ktosiek

src/graphql/language/location.py

@@ -16,6 +16,14 @@ 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):
+        return not self == other
+
 
 def get_location(source: "Source", position: int) -> SourceLocation:
     """Get the line and column for a character position in the source.

tests/language/test_location.py

@@ -0,0 +1,12 @@
+from graphql import SourceLocation
+
+
+def describe_SourceLocation():
+    def equals_with_itself():
+        assert SourceLocation(1, 2) == SourceLocation(1, 2)
+        assert (SourceLocation(1, 2) != SourceLocation(1, 2)) is False
+
+    def equals_with_formatted_form():
+        sl = SourceLocation(1, 2)
+        assert SourceLocation(1, 2) == sl.formatted
+        assert (SourceLocation(1, 2) != sl.formatted) is False