74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
#[derive(Debug, PartialEq, Clone, Eq)]
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pub struct TicketDescription(String);
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#[derive(Debug, thiserror::Error)]
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pub enum TicketDescriptionError {
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#[error("The description cannot be empty")]
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Empty,
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#[error("The description cannot be longer than 500 bytes")]
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TooLong,
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}
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impl TryFrom<String> for TicketDescription {
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type Error = TicketDescriptionError;
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fn try_from(value: String) -> Result<Self, Self::Error> {
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validate(&value)?;
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Ok(Self(value))
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}
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}
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impl TryFrom<&str> for TicketDescription {
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type Error = TicketDescriptionError;
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fn try_from(value: &str) -> Result<Self, Self::Error> {
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validate(value)?;
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Ok(Self(value.to_string()))
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}
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}
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fn validate(description: &str) -> Result<(), TicketDescriptionError> {
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if description.is_empty() {
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Err(TicketDescriptionError::Empty)
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} else if description.len() > 500 {
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Err(TicketDescriptionError::TooLong)
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} else {
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use common::{overly_long_description, valid_description};
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use std::convert::TryFrom;
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#[test]
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fn test_try_from_string() {
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let input = valid_description();
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let description = TicketDescription::try_from(input.clone()).unwrap();
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assert_eq!(description.0, input);
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}
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#[test]
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fn test_try_from_empty_string() {
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let err = TicketDescription::try_from("".to_string()).unwrap_err();
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assert_eq!(err.to_string(), "The description cannot be empty");
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}
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#[test]
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fn test_try_from_long_string() {
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let err = TicketDescription::try_from(overly_long_description()).unwrap_err();
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assert_eq!(
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err.to_string(),
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"The description cannot be longer than 500 bytes"
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);
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}
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#[test]
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fn test_try_from_str() {
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let description = TicketDescription::try_from("A description").unwrap();
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assert_eq!(description.0, "A description");
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}
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}
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