refactor: try to remove unnecessary tests in error mod (#750)

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

src/sql/src/error.rs

@@ -185,63 +185,3 @@ impl ErrorExt for Error {
         self
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use std::assert_matches::assert_matches;
-
-    use super::*;
-
-    fn throw_sp_error() -> std::result::Result<(), ParserError> {
-        Err(ParserError::ParserError("parser error".to_string()))
-    }
-
-    #[test]
-    fn test_syntax_error() {
-        let err = throw_sp_error()
-            .context(SyntaxSnafu { sql: "" })
-            .err()
-            .unwrap();
-        assert_matches!(
-            err,
-            Error::Syntax {
-                sql: _,
-                source: ParserError::ParserError { .. }
-            }
-        );
-        assert_eq!(StatusCode::InvalidSyntax, err.status_code());
-
-        let err = throw_sp_error()
-            .context(UnexpectedSnafu {
-                sql: "",
-                expected: "",
-                actual: "",
-            })
-            .err()
-            .unwrap();
-        assert_eq!(StatusCode::InvalidSyntax, err.status_code());
-    }
-
-    #[test]
-    fn test_unsupported_error() {
-        let err = Error::Unsupported {
-            sql: "".to_string(),
-            keyword: "".to_string(),
-        };
-        assert_eq!(StatusCode::Unsupported, err.status_code());
-    }
-
-    #[test]
-    pub fn test_tokenizer_error() {
-        let err = Error::Tokenizer {
-            sql: "".to_string(),
-            source: sqlparser::tokenizer::TokenizerError {
-                message: "tokenizer error".to_string(),
-                col: 1,
-                line: 1,
-            },
-        };
-
-        assert_eq!(StatusCode::InvalidSyntax, err.status_code());
-    }
-}