:white_check_mark: added tests for current feature set.

assembly/src/lexer.rs

@@ -183,6 +183,14 @@ mod tests {
         Ok(())
     }
 
+    #[test]
+    #[should_panic(expected = "InvalidInstruction { line: 1, column: 1, instruction: \"print\" }")]
+    fn invalid_instruction() {
+        Lexer::new()
+            .tokenize("print".chars())
+            .unwrap();
+    }
+
     #[test]
     fn decimals() -> Result<(), LexerError> {
         for n in [0, 23, 42, 1337, 500000] {
@@ -207,4 +215,19 @@ mod tests {
             .tokenize((u64::MAX.to_string() + "0").chars())
             .unwrap();
     }
+
+    #[test]
+    fn comma() -> Result<(), LexerError> {
+        let tokens = Lexer::new()
+            .tokenize(",".chars())?;
+        let expected = vec![
+            TokenInfo {
+                token: Token::Comma,
+                line: 1,
+                column: 1,
+            }
+        ];
+        assert_eq!(tokens, expected);
+        Ok(())
+    }
 }