Add WikiText103 and WikiText2 Mocked Unit Tests

test/datasets/test_wikitexts.py

@@ -0,0 +1,94 @@
+import os
+import random
+import string
+import zipfile
+from collections import defaultdict
+from unittest.mock import patch
+
+from ..common.parameterized_utils import nested_params
+from torchtext.datasets.wikitext103 import WikiText103
+from torchtext.datasets.wikitext2 import WikiText2
+
+from ..common.case_utils import TempDirMixin, zip_equal
+from ..common.torchtext_test_case import TorchtextTestCase
+
+
+def _get_mock_dataset(root_dir, base_dir_name):
+    """
+    root_dir: directory to the mocked dataset
+    base_dir_name: WikiText103 or WikiText2
+    """
+    base_dir = os.path.join(root_dir, base_dir_name)
+    temp_dataset_dir = os.path.join(base_dir, "temp_dataset_dir")
+    os.makedirs(temp_dataset_dir, exist_ok=True)
+
+    seed = 1
+    mocked_data = defaultdict(list)
+    file_names = ("wiki.train.tokens", "wiki.valid.tokens", "wiki.test.tokens")
+    for file_name in file_names:
+        csv_file = os.path.join(temp_dataset_dir, file_name)
+        mocked_lines = mocked_data[os.path.splitext(file_name)[0]]
+        with open(csv_file, "w") as f:
+            for i in range(5):
+                rand_string = " ".join(
+                    random.choice(string.ascii_letters) for i in range(seed)
+                )
+                dataset_line = rand_string
+                f.write(f'{rand_string}\n')
+
+                # append line to correct dataset split
+                mocked_lines.append(dataset_line)
+                seed += 1
+
+    if base_dir_name == WikiText103.__name__:
+        compressed_file = "wikitext-103-v1"
+    else:
+        compressed_file = "wikitext-2-v1"
+
+    compressed_dataset_path = os.path.join(base_dir, compressed_file + ".zip")
+    # create zip file from dataset folder
+    with zipfile.ZipFile(compressed_dataset_path, "w") as zip_file:
+        for file_name in file_names:
+            txt_file = os.path.join(temp_dataset_dir, file_name)
+            zip_file.write(txt_file, arcname=compressed_file)
+
+    return mocked_data
+
+
+class TestWikiTexts(TempDirMixin, TorchtextTestCase):
+    root_dir = None
+    samples = []
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.root_dir = cls.get_base_temp_dir()
+        cls.patcher = patch(
+            "torchdata.datapipes.iter.util.cacheholder._hash_check", return_value=True
+        )
+        cls.patcher.start()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.patcher.stop()
+        super().tearDownClass()
+
+    @nested_params([WikiText103, WikiText2], ["train", "valid", "test"])
+    def test_wikitexts(self, wikitext_dataset, split):
+        expected_samples = _get_mock_dataset(self.root_dir, base_dir_name=wikitext_dataset.__name__)[split]
+
+        dataset = wikitext_dataset(root=self.root_dir, split=split)
+        samples = list(dataset)
+        for sample, expected_sample in zip_equal(samples, expected_samples):
+            self.assertEqual(sample, expected_sample)
+
+    @nested_params([WikiText103, WikiText2], ["train", "valid", "test"])
+    def test_wikitexts_split_argument(self, wikitext_dataset, split):
+        # call `_get_mock_dataset` to create mock dataset files
+        _ = _get_mock_dataset(self.root_dir, wikitext_dataset.__name__)
+
+        dataset1 = wikitext_dataset(root=self.root_dir, split=split)
+        (dataset2,) = wikitext_dataset(root=self.root_dir, split=(split,))
+
+        for d1, d2 in zip_equal(dataset1, dataset2):
+            self.assertEqual(d1, d2)