added tests, changed __main__ to cli

tests/cli.py

@@ -0,0 +1,31 @@
+import pytest
+
+from tiktok_hashtag_analysis.cli import create_parser
+
+ARGUMENTS = [
+    ("file", "hashtags.txt", "--file"),
+    ("download", True, "--download"),
+    ("download", True, "-d"),
+    ("number", 20, "--number"),
+    ("plot", True, "--plot"),
+    ("plot", True, "-p"),
+    ("table", True, "--table"),
+    ("table", True, "-t"),
+    ("output_dir", "/tmp/tiktok_download", "--output-dir"),
+    ("config", "~/.tiktok", "--config"),
+    ("log", "../logfile.log", "--log"),
+]
+
+
+@pytest.mark.parametrize("attribute,value,flag", ARGUMENTS)
+def test_parser(hashtags, attribute, value, flag):
+    argument_list = [*hashtags, flag]
+
+    if not isinstance(value, bool):
+        argument_list.append(str(value))
+
+    parser = create_parser()
+    args = vars(parser.parse_args(argument_list))
+
+    assert args.get(attribute) == value
+    assert args.get("hashtags") == hashtags