feat(tests): added tests for parser and tokenizer of empty inputs

src/parser/parse.rs

@@ -59,11 +59,23 @@ fn priority_2_terminal(data: &[FinalToken]) -> Result<Expression<String>, ParseT
 #[cfg(test)]
 mod tests {
     use crate::expressions::Expression::{Constant, Literal};
+    use crate::parser::error::ParseTokensError::EmptySideOfOperator;
     use crate::parser::{tokenize, ParseError};
     use crate::traits::SemanticEq;
 
     use super::*;
 
+    #[test]
+    fn test_empty_nok() -> Result<(), ParseError> {
+        let input = tokenize("")?;
+        let actual = parse_tokens(&input);
+
+        assert!(actual.is_err());
+        assert_eq!(actual.unwrap_err(), EmptySideOfOperator);
+
+        Ok(())
+    }
+
     #[test]
     fn test_binaryand_ok() -> Result<(), ParseError> {
         let input = tokenize("a & b")?;

src/parser/tokenize.rs

@@ -187,6 +187,16 @@ mod tests {
 
     use super::*;
 
+    #[test]
+    fn test_empty_technicallyok() -> Result<(), TokenizeError> {
+        let input = "";
+
+        let actual = tokenize(input)?;
+        assert_eq!(actual, vec![]);
+
+        Ok(())
+    }
+
     #[test]
     fn test_charvar_ok() -> Result<(), TokenizeError> {
         let actual = tokenize("a")?;