Refactoring utils with adding several new ones

src/frostfs_testlib/utils/string_utils.py

@@ -0,0 +1,31 @@
+import random
+import re
+import string
+
+ONLY_ASCII_LETTERS = string.ascii_letters
+DIGITS_AND_ASCII_LETTERS = string.ascii_letters + string.digits
+
+
+def random_string(length: int = 5, source: str = ONLY_ASCII_LETTERS):
+    """
+    Generate random string from source letters list
+
+    Args:
+         length: length for generated string
+         source: source string with letters for generate random string
+    Returns:
+        (str): random string with len == length
+    """
+
+    return "".join(random.choice(string.ascii_letters) for i in range(length))
+
+
+def is_str_match_pattern(error: Exception, status_pattern: str) -> bool:
+    """
+    Determines whether exception matches specified status pattern.
+
+    We use re.search() to be consistent with pytest.raises.
+    """
+    match = re.search(status_pattern, str(error))
+
+    return match is not None