diff --git a/src/main.rs b/src/main.rs
index d983ef40..cba58c95 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -73,20 +73,57 @@ struct TrSprite {
 
 
 
+use logos::Logos;
+
+#[derive(Logos, Debug, PartialEq)]
+enum Token {
+    // Tokens can be literal strings, of any length.
+    #[token("fast")]
+    Fast,
+
+    #[token(".")]
+    Period,
+
+    // Or regular expressions.
+    #[regex("[a-zA-Z]+")]
+    Text,
+
+    // Logos requires one token variant to handle errors,
+    // it can be named anything you wish.
+    #[error]
+    // We can also use this variant to define whitespace,
+    // or any other matches we wish to skip.
+    #[regex(r"[ \t\n\f]+", logos::skip)]
+    Error,
+}
 
 pub fn main() {
 
+    //https://dylanede.github.io/cassowary-rs/cassowary/index.html
 
+    let mut lex = Token::lexer("Create ridiculously fast Lexers.");
 
+    assert_eq!(lex.next(), Some(Token::Text));
+    assert_eq!(lex.span(), 0..6);
+    assert_eq!(lex.slice(), "Create");
 
+    assert_eq!(lex.next(), Some(Token::Text));
+    assert_eq!(lex.span(), 7..19);
+    assert_eq!(lex.slice(), "ridiculously");
 
+    assert_eq!(lex.next(), Some(Token::Fast));
+    assert_eq!(lex.span(), 20..24);
+    assert_eq!(lex.slice(), "fast");
 
+    assert_eq!(lex.next(), Some(Token::Text));
+    assert_eq!(lex.span(), 25..31);
+    assert_eq!(lex.slice(), "Lexers");
 
+    assert_eq!(lex.next(), Some(Token::Period));
+    assert_eq!(lex.span(), 31..32);
+    assert_eq!(lex.slice(), ".");
 
-
-
-
-
+    assert_eq!(lex.next(), None);