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)
+    }
+

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"
+}

test/example-walrus-normalization/representation.json

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+{
+    "version": 2
+}