package Ġcom . net ki . extensions Ċ Ċ import Ġorg . junit . jupiter . api . Assertions . assertFalse Ċ import Ġorg . junit . jupiter . api . Assertions . assertTrue Ċ import Ġorg . junit . jupiter . api . Test Ċ import Ġorg . junit . jupiter . api . Test Instance Ċ Ċ @ Test Instance ( Test Instance . Lifecycle . PER _ CLASS ) Ċ internal Ġclass ĠString Extensions Test Ġ{ ĊĊĠĠĠ Ġ@ Test ĊĠĠĠ Ġfun Ġ` Validate Ġthat Ġstrings Ġare Ġvalid Ġal phanumeric Ġstrings `() Ġ{ ĊĠĠĠĠĠĠĠ ĠassertTrue (" Ab c 1 2 3 4 ". is Alpha Numeric ()) ĊĠĠĠĠĠĠĠ ĠassertTrue (" Valid _ string ". is Alpha Numeric ()) ĊĠĠĠĠĠĠĠ ĠassertTrue (" Another - Valid Ġstring Ġ 1 2 3 4 . 5 ". is Alpha Numeric ()) ĊĠĠĠĠĠĠĠ ĠassertFalse (" Not ĠValid Ġ# ". is Alpha Numeric ()) ĊĠĠĠĠĠĠĠ ĠassertFalse ("# $ % Ġless Ġvalid ". is Alpha Numeric ()) ĊĠĠĠĠĠĠĠ ĠassertFalse ("% 1 2 3 4 ". is Alpha Numeric ()) ĊĠĠĠ Ġ} Ċ } Ċ