fix: allow hashable types to be used as dictionary keys (#103)

* test: add failing test case

* fix: always sort serialized

* test: add dict keys test case

* chore: update changelog

* refactor: use serialize as sort key

CHANGELOG.md

@@ -8,6 +8,7 @@ From v1.0.0 onwards, this project adheres to [Semantic Versioning](https://semve
 
 ## Master (Unreleased)
 
+- Fix issue with using hashables as dict keys or in sets (#103)
 - Add support for custom objects repr (#101)
 - Add support for nested test classes (#99)
 - Remove `_snapshot_subdirectory_name` from `SnapshotFossilizer` (#99)

src/syrupy/extensions/amber.py

@@ -1,4 +1,3 @@
-import hashlib
 import os
 from types import GeneratorType
 from typing import (
@@ -79,18 +78,10 @@ def read_file(cls, filepath: str) -> "SnapshotFossil":
 
     @classmethod
     def sort(cls, iterable: Iterable[Any]) -> Iterable[Any]:
-        def _sort_key(value: Any) -> Any:
-            if isinstance(value, frozenset):
-                h = hashlib.sha256()
-                for element in cls.sort(value):
-                    h.update(str(element).encode("utf-8"))
-                return h.hexdigest()
-            return value
-
         try:
             return sorted(iterable)
         except TypeError:
-            return sorted(iterable, key=_sort_key)
+            return sorted(iterable, key=cls.serialize)
 
     @classmethod
     def with_indent(cls, string: str, depth: int) -> str:

tests/__snapshots__/test_extension_amber.ambr

@@ -102,6 +102,27 @@
     ],
   }
 ---
+# name: test_dict[actual2]
+  <class 'dict'> {
+    'a': 'Some ttext.',
+    1: True,
+    <class 'ExampleTuple'> (
+      1,
+      2,
+      3,
+      4,
+    ): <class 'dict'> {
+      'e': False,
+    },
+    <class 'frozenset'> {
+      '1',
+      '2',
+    }: <class 'list'> [
+      '1',
+      2,
+    ],
+  }
+---
 # name: test_empty_snapshot
   None
 ---
@@ -139,22 +160,44 @@
 # name: test_reflection
   SnapshotAssertion(name='snapshot', num_executions=0)
 ---
-# name: test_set
+# name: test_set[actual0]
   <class 'set'> {
     'a',
     'is',
     'set',
     'this',
   }
 ---
-# name: test_set.1
+# name: test_set[actual1]
   <class 'set'> {
+    'contains',
+    'frozen',
     <class 'frozenset'> {
       '1',
       '2',
     },
+  }
+---
+# name: test_set[actual2]
+  <class 'set'> {
     'contains',
-    'frozen',
+    'tuple',
+    <class 'tuple'> (
+      1,
+      2,
+    ),
+  }
+---
+# name: test_set[actual3]
+  <class 'set'> {
+    'contains',
+    'namedtuple',
+    <class 'ExampleTuple'> (
+      1,
+      2,
+      3,
+      4,
+    ),
   }
 ---
 # name: test_string[0]

tests/test_extension_amber.py

@@ -49,30 +49,44 @@ def test_multiple_snapshots(snapshot):
     assert snapshot == "Third."
 
 
+ExampleTuple = namedtuple("ExampleTuple", ["a", "b", "c", "d"])
+
+
+def test_tuple(snapshot):
+    assert snapshot == ("this", "is", ("a", "tuple"))
+    assert snapshot == ExampleTuple(a="this", b="is", c="a", d={"named", "tuple"})
+
+
+@pytest.mark.parametrize(
+    "actual",
+    [
+        {"this", "is", "a", "set"},
+        {"contains", "frozen", frozenset({"1", "2"})},
+        {"contains", "tuple", (1, 2)},
+        {"contains", "namedtuple", ExampleTuple(a=1, b=2, c=3, d=4)},
+    ],
+)
+def test_set(snapshot, actual):
+    assert snapshot == actual
+
+
 @pytest.mark.parametrize(
     "actual",
     [
         {"b": True, "c": "Some text.", "d": ["1", 2], "a": {"e": False}},
         {"b": True, "c": "Some ttext.", "d": ["1", 2], "a": {"e": False}},
+        {
+            1: True,
+            "a": "Some ttext.",
+            frozenset({"1", "2"}): ["1", 2],
+            ExampleTuple(a=1, b=2, c=3, d=4): {"e": False},
+        },
     ],
 )
 def test_dict(snapshot, actual):
     assert actual == snapshot
 
 
-def test_set(snapshot):
-    assert snapshot == {"this", "is", "a", "set"}
-    assert snapshot == {"contains", "frozen", frozenset({"1", "2"})}
-
-
-ExampleTuple = namedtuple("ExampleTuple", ["a", "b", "c", "d"])
-
-
-def test_tuple(snapshot):
-    assert snapshot == ("this", "is", ("a", "tuple"))
-    assert snapshot == ExampleTuple(a="this", b="is", c="a", d={"named", "tuple"})
-
-
 def test_numbers(snapshot):
     assert snapshot == 3.5
     assert snapshot == 7