Add test for walrus operator

test/example-walrus-normalization/.meta/config.json

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+{
+  "authors": [
+    "brocla"
+  ],
+  "files": {
+    "solution": [
+      "example_walrus_normalization.py"
+    ]
+  }
+}

test/example-walrus-normalization/example_walrus_normalization.py

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+# Examples of walrus usage in user solutions
+
+
+def slices(series, length):
+    """
+    Given a string of digits, output all the contiguous substrings of length `n`,
+    in that string, in the order that they appear.
+    """
+    return [
+        sub_str
+        for i, _ in enumerate(series)
+        if len(sub_str := series[i : i + length]) == length
+    ]
+
+
+def check_height(grid):
+    """check that row count is a multiple of 4"""
+    if (height := len(grid)) % 3:
+        raise ValueError("grid rows not a multiple of 4")
+    return height
+
+
+def nswe_points(self, point):
+    """return a set of four adjacent points"""
+    nswe_offsets = set([(1, 0), (-1, 0), (0, -1), (0, 1)])
+    return {
+        neighbor
+        for offset in nswe_offsets
+        if self.on_the_board(neighbor := point + offset)
+    }
+
+
+def first_item_greater_than_N(iterable, N):
+    if any((item := x) > N for x in iterable):
+        return item
+    return None
+
+
+def generate_codes(seat_numbers, flight_id):
+    """Generate codes for a ticket.
+
+    :param seat_numbers: list[str] - list of seat numbers.
+    :param flight_id: str - string containing the flight identifier.
+    :return: generator - generator that yields 12 character long ticket codes.
+
+    """
+    return (
+        base.ljust(12, "0") for seat in seat_numbers if (base := f"{seat}{flight_id}")
+    )

test/example-walrus-normalization/mapping.json

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+{
+    "placeholder_0": "slices",
+    "placeholder_1": "series",
+    "placeholder_2": "length",
+    "placeholder_3": "i",
+    "placeholder_4": "_",
+    "placeholder_5": "sub_str",
+    "placeholder_6": "check_height",
+    "placeholder_7": "grid",
+    "placeholder_8": "height",
+    "placeholder_9": "nswe_points",
+    "placeholder_10": "point",
+    "placeholder_11": "nswe_offsets",
+    "placeholder_12": "offset",
+    "placeholder_13": "neighbor",
+    "placeholder_14": "first_item_greater_than_N",
+    "placeholder_15": "iterable",
+    "placeholder_16": "N",
+    "placeholder_17": "item",
+    "placeholder_18": "x",
+    "placeholder_19": "placeholder_17",
+    "placeholder_20": "generate_codes",
+    "placeholder_21": "seat_numbers",
+    "placeholder_22": "flight_id",
+    "placeholder_23": "seat",
+    "placeholder_24": "base"
+}

test/example-walrus-normalization/representation.json

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+{
+    "version": 2
+}