mono_rt/
error.rs

1//! Errors related to Mono.
2
3use thiserror::Error;
4
5pub type Result<T> = std::result::Result<T, MonoError>;
6
7#[derive(Debug, Error)]
8pub enum MonoError {
9    #[error("DLL `{0}` not found")]
10    DllNotFound(String),
11    #[error("Export not found in DLL: `{0}`")]
12    FnNotFound(&'static str),
13    #[error("Mono API already initialized! Multiple calls to `mono::init()` are not necessary.")]
14    AlreadyInitialized,
15    #[error("Mono API not initialized! Call `mono::init()` first.")]
16    Uninitialized,
17    #[error("string argument contains an interior null byte")]
18    NullByteInName,
19    #[error("managed exception was thrown during method invocation")]
20    ManagedException(crate::MonoObject),
21}
22
23#[cfg(test)]
24mod tests {
25    use std::error::Error;
26
27    use super::MonoError;
28    use crate::MonoObject;
29
30    #[test]
31    fn dll_not_found_display() {
32        let e = MonoError::DllNotFound("mono.dll".to_owned());
33        assert_eq!(e.to_string(), "DLL `mono.dll` not found");
34    }
35
36    #[test]
37    fn fn_not_found_display() {
38        let e = MonoError::FnNotFound("mono_get_root_domain");
39        assert_eq!(
40            e.to_string(),
41            "Export not found in DLL: `mono_get_root_domain`"
42        );
43    }
44
45    #[test]
46    fn already_initialized_display() {
47        let e = MonoError::AlreadyInitialized;
48        assert!(e.to_string().contains("already initialized"));
49    }
50
51    #[test]
52    fn uninitialized_display() {
53        let e = MonoError::Uninitialized;
54        assert!(e.to_string().contains("not initialized"));
55    }
56
57    #[test]
58    fn null_byte_in_name_display() {
59        let e = MonoError::NullByteInName;
60        assert_eq!(
61            e.to_string(),
62            "string argument contains an interior null byte"
63        );
64    }
65
66    #[test]
67    fn managed_exception_display() {
68        let obj = unsafe { MonoObject::from_ptr_unchecked(std::ptr::dangling_mut()) };
69        let e = MonoError::ManagedException(obj);
70        assert_eq!(
71            e.to_string(),
72            "managed exception was thrown during method invocation"
73        );
74    }
75
76    #[test]
77    fn implements_std_error_trait() {
78        let e: Box<dyn Error> = Box::new(MonoError::Uninitialized);
79        assert!(e.source().is_none());
80    }
81
82    #[test]
83    fn dll_not_found_debug_contains_variant_name() {
84        let e = MonoError::DllNotFound("x.dll".to_owned());
85        assert!(format!("{e:?}").contains("DllNotFound"));
86    }
87
88    #[test]
89    fn fn_not_found_debug_contains_variant_name() {
90        let e = MonoError::FnNotFound("some_export");
91        assert!(format!("{e:?}").contains("FnNotFound"));
92    }
93}
mono_rt/error.rs

mono_rt/
error.rs
