some test

crates/lexer/src/lib.rs

@@ -129,4 +129,25 @@ pub fn lexer() -> impl Parser<char, Vec<(Token, Span)>, Error = Simple<char>> {
 pub fn lex(src: String) -> (Option<Vec<(Token, std::ops::Range<usize>)>>, Vec<Simple<char>>) {
     let (tokens, lex_error) = lexer().parse_recovery(src.as_str());
     return (tokens, lex_error);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn lex_let_simple() {
+        let (tokens, err) = lex("let x: Int = 1;".to_string());
+
+        assert_eq!(tokens, Some(vec![
+            (Token::KwLet, 0..3),
+            (Token::Identifier("x".to_string()), 4..5),
+            (Token::Colon, 5..6),
+            (Token::Identifier("Int".to_string()), 7..10),
+            (Token::Assign, 11..12),
+            (Token::Int(1), 13..14),
+            (Token::SemiColon, 14..15),
+        ]));
+        assert_eq!(err, vec![]);
+    }
 }

crates/parser/src/lib.rs

@@ -228,4 +228,24 @@ pub fn parse(tokens: Vec<(Token, std::ops::Range<usize>)>, len: usize) -> (Optio
     ));
 
     return (ast, parse_error)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_simple() {
+        let (_, err) = parse(vec![
+            (Token::KwLet, 0..3),
+            (Token::Identifier("x".to_string()), 4..5),
+            (Token::Colon, 5..6),
+            (Token::Identifier("Int".to_string()), 7..10),
+            (Token::Assign, 11..12),
+            (Token::Int(1), 13..14),
+            (Token::SemiColon, 14..15),
+        ], 15);
+
+        assert_eq!(err, vec![]);
+    }
 }