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|
mod ledger;
mod store;
use miette::{Diagnostic, ErrReport, Result};
use store::{Context, Store};
use thiserror::Error;
#[derive(Default)]
pub struct App {
context: Context,
error: Option<ErrReport>,
exit: bool,
}
#[derive(Diagnostic, Debug, Error, PartialEq)]
#[error("An overflow error occurred")]
#[diagnostic()]
pub struct OverflowError {
#[help]
pub _msg: String,
}
impl App {
/// Build context in App and pass it forward
pub fn init_context(&mut self) -> Result<&mut Self> {
let store = self.context.unwrap_store();
store.init()?;
Ok(self)
}
pub fn get_exit_status(&self) -> bool {
self.exit
}
pub fn exit(&mut self) -> Result<()> {
self.exit = true;
Ok(())
}
pub fn decrement_counter(&mut self) -> Result<()> {
let store = self.context.unwrap_store();
let count = store.get_counter()?;
if count == 0 {
Err(OverflowError {
_msg: "Cannot count below 0".into(),
}
.into())
} else {
store.set_counter(count - 1)?;
Ok(())
}
}
pub fn increment_counter(&mut self) -> Result<()> {
let store = self.context.unwrap_store();
let count = store.get_counter()?;
if count == u8::MAX {
Err(OverflowError {
_msg: "Cannot count above u8::MAX".into(),
}
.into())
} else {
store.set_counter(count + 1)?;
Ok(())
}
}
pub fn display_counter(&self) -> String {
self.context
.get_store()
.get_counter()
.map(|u| u.to_string())
.unwrap_or("Error".into())
}
pub fn set_error(&mut self, error: ErrReport) -> Result<()> {
self.error = Some(error);
Ok(())
}
pub fn get_error(&self) -> &Option<ErrReport> {
&self.error
}
/// Clears any existing input error in the app state
pub fn clear_error(&mut self) -> Result<()> {
self.error = None;
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use store::ContextError;
fn get_count(app: &App) -> Result<u8, ContextError> {
app.context.get_store().get_counter()
}
#[test]
fn display_counter_inited() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let count = app.display_counter();
assert_eq!(count, "0");
}
#[test]
fn display_counter_noninited() {
let app = App::default();
let count = app.display_counter();
assert_eq!(count, "Error");
}
#[test]
fn increment_decrement() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let res = app.increment_counter();
assert!(res.is_ok());
assert_eq!(get_count(&app).unwrap(), 1);
let res = app.decrement_counter();
assert!(res.is_ok());
assert_eq!(get_count(&app).unwrap(), 0);
}
#[test]
fn increment_n() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let n = 8;
for i in 1..=n {
let res = app.increment_counter();
assert!(res.is_ok());
assert_eq!(get_count(&app).unwrap(), i);
}
assert_eq!(get_count(&app).unwrap(), n);
}
#[test]
fn increment_n_decrement() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let n = 8;
for i in 1..=n {
let res = app.increment_counter();
assert!(res.is_ok());
assert_eq!(get_count(&app).unwrap(), i);
}
assert_eq!(get_count(&app).unwrap(), n);
let res = app.decrement_counter();
assert!(res.is_ok());
assert_eq!(get_count(&app).unwrap(), n - 1);
}
#[test]
fn exit() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let res = app.exit();
assert!(res.is_ok());
assert!(app.exit);
}
#[test]
fn decrement_counter_error() {
let mut app = App::default();
assert!(app.init_context().is_ok());
let res = app.decrement_counter();
assert!(res.is_err());
let res_err = res.unwrap_err();
let casted_val = res_err
.downcast_ref::<OverflowError>()
.expect("something bad occurred");
let expected_err_msg: String = "Cannot count below 0".into();
assert_eq!(casted_val._msg, expected_err_msg);
assert_eq!(
*casted_val,
OverflowError {
_msg: expected_err_msg,
},
);
}
#[test]
fn increment_counter_error() {
let mut app = App::default();
assert!(app.init_context().is_ok());
assert!(app.context.unwrap_store().set_counter(u8::MAX).is_ok());
let res = app.increment_counter();
assert!(res.is_err());
let res_err = res.unwrap_err();
let casted_val = res_err
.downcast_ref::<OverflowError>()
.expect("something bad occurred");
let expected_err_msg: String = "Cannot count above u8::MAX".into();
assert_eq!(casted_val._msg, expected_err_msg);
assert_eq!(
*casted_val,
OverflowError {
_msg: expected_err_msg,
},
);
}
}
|
