* Add tests for flag features

tests/test_flag_features.py

@@ -0,0 +1,41 @@
+import pytest
+
+from orth import is_alpha
+from orth import is_digit
+from orth import is_punct
+from orth import is_space
+from orth import is_ascii
+from orth import is_upper
+from orth import is_lower
+from orth import is_title
+
+
+@pytest.fixture
+def words():
+    return ["1997", "19.97", "hello9", "Hello", "HELLO", "Hello9", "\n", "!",
+            "!d", "\nd"]
+
+def test_is_alpha(words):
+    assert is_alpha(words[0]) == False
+    assert is_alpha(words[1]) == False
+    assert is_alpha(words[2]) == False
+    assert is_alpha(words[3]) == True
+    assert is_alpha(words[4]) == True
+    assert is_alpha(words[5]) == False
+    assert is_alpha(words[6]) == False
+    assert is_alpha(words[7]) == False
+    assert is_alpha(words[8]) == False
+    assert is_alpha(words[9]) == False
+
+
+def test_is_digit(words):
+    assert is_digit(words[0]) == False
+    assert is_digit(words[1]) == False
+    assert is_digit(words[2]) == False
+    assert is_digit(words[3]) == True
+    assert is_digit(words[4]) == True
+    assert is_digit(words[5]) == False
+    assert is_digit(words[6]) == False
+    assert is_digit(words[7]) == False
+    assert is_digit(words[8]) == False
+    assert is_digit(words[9]) == False