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use std::io;
use mlua::{Error, ErrorContext, Lua, Result};
#[test]
fn test_error_context() -> Result<()> {
let lua = Lua::new();
let func = lua.create_function(|_, ()| {
Err::<(), _>(Error::RuntimeError("runtime error".into())).context("some context")
})?;
lua.globals().set("func", func)?;
let msg = lua
.load("local _, err = pcall(func); return tostring(err)")
.eval::<String>()?;
assert!(msg.contains("some context"));
assert!(msg.contains("runtime error"));
let func2 = lua.create_function(|lua, ()| {
lua.globals()
.get::<_, String>("nonextant")
.with_context(|_| "failed to find global")
})?;
lua.globals().set("func2", func2)?;
let msg2 = lua
.load("local _, err = pcall(func2); return tostring(err)")
.eval::<String>()?;
assert!(msg2.contains("failed to find global"));
println!("{msg2}");
assert!(msg2.contains("error converting Lua nil to String"));
// Rewrite context message and test `downcast_ref`
let func3 = lua.create_function(|_, ()| {
Err::<(), _>(Error::external(io::Error::new(
io::ErrorKind::Other,
"other",
)))
.context("some context")
.context("some new context")
})?;
let res = func3.call::<_, ()>(()).err().unwrap();
let Error::CallbackError { cause, .. } = &res else { unreachable!() };
assert!(!res.to_string().contains("some context"));
assert!(res.to_string().contains("some new context"));
assert!(cause.downcast_ref::<io::Error>().is_some());
Ok(())
}
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