add some text

some_text.txt

@@ -0,0 +1,3 @@
+foo
+bar
+foobar

test.py

@@ -8,7 +8,7 @@ _DESCRIPTION = """\
 This is a test dataset.
 """
 
-_URL = "https://pastebin.com/raw/HvpE1CnA"  # a dummy data file
+_URLS = {"train": "https://pastebin.com/raw/HvpE1CnA", "dev": "some_text.txt"}
 
 
 class Test(datasets.GeneratorBasedBuilder):
@@ -29,10 +29,11 @@ class Test(datasets.GeneratorBasedBuilder):
         )
 
     def _split_generators(self, dl_manager):
-        downloaded_file = dl_manager.download_and_extract(_URL)
+        downloaded_files = dl_manager.download_and_extract(_URLS)
 
         return [
-            datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepath": downloaded_file}),
+            datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepath": downloaded_files["train"]}),
+            datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepath": downloaded_files["dev"]}),
         ]
 
     def _generate_examples(self, filepath):