feat(): add assert_with_ignore

fix(): add compatibility with PY 3.5

snapshottest/ignore.py

@@ -0,0 +1,42 @@
+import re
+
+
+def update_path(current_path, key_or_index, is_dict=False):
+    if is_dict:
+        if current_path == "":
+            return key_or_index
+        return "{}.{}".format(current_path,key_or_index)
+    else:
+        return "{}[{}]".format(current_path,key_or_index)
+
+
+def clear_ignore_keys(data, ignore_keys, current_path=""):
+    if isinstance(data, dict):
+        for key, value in data.items():
+            temp_path = update_path(current_path, key, is_dict=True)
+            matched = match_ignored_key(key, data, ignore_keys, temp_path)
+            if not matched:
+                data[key] = clear_ignore_keys(value, ignore_keys, temp_path)
+        return data
+    elif isinstance(data, list):
+        for index, value in enumerate(data):
+            temp_path = update_path(current_path, index)
+            matched = match_ignored_key(index, data, ignore_keys, temp_path)
+            if not matched:
+                data[index] = clear_ignore_keys(value, ignore_keys, temp_path)
+        return data
+    elif isinstance(data, tuple):
+        return tuple(
+            clear_ignore_keys(value, ignore_keys, update_path(current_path, index))
+            for index, value in enumerate(data)
+        )
+    return data
+
+
+def match_ignored_key(key_or_index, data, ignore_keys, temp_path):
+    for ignored in ignore_keys:
+        escaped = ignored.translate(str.maketrans({"[": r"\[", "]": r"\]"}))
+        if re.match("{}$".format(escaped), temp_path):
+            data[key_or_index] = None
+            return True
+    return False

snapshottest/module.py

@@ -8,6 +8,7 @@
 from .snapshot import Snapshot
 from .formatter import Formatter
 from .error import SnapshotNotFound
+from .ignore import clear_ignore_keys
 
 
 logger = logging.getLogger(__name__)
@@ -266,6 +267,61 @@ def assert_match(self, value, name=""):
         if not name:
             self.snapshot_counter += 1
 
+    def assert_match_with_ignore(self, data, ignore_keys):
+        """Extension of assert_match to ignore data.
+        Args:
+            data (dict,list,tuple): Data to be asserted
+            ignored_keys (list): List of strings containing path to be ignored,
+            special character "[.]" can be used to ignore multiple elements in list.
+            (See Example 2)
+        Returns:
+            None: Asserts if the values are the same
+        Raises:
+            AssertionError: If the snapshot is different than the incoming data
+        Examples:
+            Test examples at: apps/tests/utils/test_asserts.py
+            Example 1:
+            >>> data={"dict1": {"dict2": {"dict3": {"id": "importantId"} } } }
+            >>> ignore_keys=["dict1.dict2.dict3.id"]
+            >>> assert_match_with_ignore(data,ignore_keys)
+                # Will create the following snapshot
+                snapshots['example_snapshot'] = {
+                    'dict1': {
+                        'dict2': {
+                            'dict3': {
+                                'id': None,
+                                'other': 'value'
+                            }
+                        }
+                    }
+                }
+            ---
+            Example 2:
+            >>> data=[
+                    {
+                    "name": "objectList",
+                    "children": [
+                        {"id": "random_string", "name": "child_1",},
+                        {"id": "random_string2", "name": "child_2",},
+                    ],
+                    }
+                ]
+            >>> ignore_keys=["[0].children[.].id"]
+            >>> assert_match_with_ignore(data,ignore_keys)
+                # Will create the following snapshot
+                snapshots['example2_snapshot'] = [
+                    {
+                    "name": "objectList",
+                    "children": [
+                        {"id": None, "name": "child_1",},
+                        {"id": None, "name": "child_2",},
+                    ],
+                    }
+                ]
+        """
+
+        self.assert_match(clear_ignore_keys(data, ignore_keys))
+
     def save_changes(self):
         self.module.save()
 

tests/test_ignore.py

@@ -0,0 +1,27 @@
+from time import time
+from snapshottest.ignore import clear_ignore_keys
+
+DATA = {
+    "name": {
+        "id": time(),
+        "first": "Manual",
+        "last": "gonazales",
+        "cities": ["1", "2", {"id": time()}],
+    }
+}
+
+DATA_EXPECTED = {
+    "name": {
+        "id": None,
+        "first": "Manual",
+        "last": "gonazales",
+        "cities": [None, "2", {"id": None}],
+    }
+}
+
+
+def test_clear_works():
+    clean_data = clear_ignore_keys(
+        DATA, ignore_keys=["name.id", "name.cities[0]", "name.cities[2].id"]
+    )
+    assert clean_data == DATA_EXPECTED

tests/test_snapshot_test.py

@@ -1,6 +1,6 @@
 import pytest
 from collections import OrderedDict
-
+from time import time
 from snapshottest.module import SnapshotModule, SnapshotTest
 
 
@@ -121,3 +121,76 @@ def test_snapshot_does_not_match_other_values(snapshot_test, value, other_value)
     with pytest.raises(AssertionError):
         snapshot_test.assert_match(other_value)
     assert_snapshot_test_failed(snapshot_test)
+
+
+SNAPSHOTABLE_VALUES_WITH_IGNORE = [
+    {
+        "data": {"dict1": {"dict2": {"dict3": {"id": time(), "other": "value"}}}},
+        "ignore_keys": ["dict1.dict2.dict3.id"],
+    },
+    {
+        "data": [
+            {
+                "A": {
+                    "id": time(),
+                    "B": 1,
+                    "C": 2,
+                    "D": [0, 1, {"A": 1}],
+                }
+            },
+            {
+                "A": {
+                    "id": time(),
+                    "B": 2,
+                    "C": 3,
+                    "D": [0, 1, {"id": time()}],
+                }
+            },
+        ],
+        "ignore_keys": ["[.].A.id", "[1].A.C[.].id"],
+    },
+    {
+        "data": {
+            "A": {
+                "id": [0, 1, 2, 3, time()],
+                "A": 1,
+                "B": 2,
+                "C": [
+                    {"id": time()},
+                    {"id": time(), "A": 0},
+                    {"id": time()},
+                ],
+            }
+        },
+        "ignore_keys": ["A.C[.].id", "A.id[4]"],
+    },
+    {
+        "data": {
+            "A": {
+                "A": {
+                    "id": time(),
+                    "A": 1,
+                    "B": 2,
+                    "C": 3,
+                    "D": [
+                        {"id": [0, time()]},
+                        {"id": {"A": [time()]}, "B": 0},
+                        {"id": time()},
+                    ],
+                }
+            }
+        },
+        "ignore_keys": ["A.A.id", "A.A.D.id[1]", "A.A.D.id.A[0"],
+    },
+]
+
+
+@pytest.mark.parametrize("values", SNAPSHOTABLE_VALUES_WITH_IGNORE, ids=repr)
+def test_snapshot_with_ignore(snapshot_test, values):
+    data = values["data"]
+    ignore_keys = values["ignore_keys"]
+    snapshot_test.assert_match_with_ignore(data, ignore_keys)
+
+    snapshot_test.reinitialize()
+    snapshot_test.assert_match_with_ignore(data, ignore_keys)
+    assert_snapshot_test_succeeded(snapshot_test)