injectable_rs_graph/
error.rs

1//! Graph-level error type.
2
3use crate::ValidationError;
4
5/// Errors that can occur during graph construction or validation.
6#[derive(Debug)]
7pub enum GraphError {
8    /// Validation failed with one or more errors.
9    ValidationFailed(Vec<ValidationError>),
10}
11
12impl std::fmt::Display for GraphError {
13    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
14        match self {
15            Self::ValidationFailed(errors) => {
16                writeln!(f, "dependency graph validation failed:")?;
17                for err in errors {
18                    writeln!(f, "  - {err}")?;
19                }
20                Ok(())
21            }
22        }
23    }
24}
25
26impl std::error::Error for GraphError {}
27
28impl From<Vec<ValidationError>> for GraphError {
29    fn from(errors: Vec<ValidationError>) -> Self {
30        Self::ValidationFailed(errors)
31    }
32}
33
34#[cfg(test)]
35mod tests {
36    use super::*;
37    use crate::ValidationError;
38
39    #[test]
40    fn display_validation_failed_single_error() {
41        let err = GraphError::ValidationFailed(vec![ValidationError::DuplicateNode {
42            name: "Foo".to_string(),
43        }]);
44        let s = err.to_string();
45        assert!(s.contains("dependency graph validation failed"));
46        assert!(s.contains("Foo"));
47    }
48
49    #[test]
50    fn display_validation_failed_multiple_errors() {
51        let err = GraphError::ValidationFailed(vec![
52            ValidationError::DuplicateNode {
53                name: "A".to_string(),
54            },
55            ValidationError::DuplicateNode {
56                name: "B".to_string(),
57            },
58        ]);
59        let s = err.to_string();
60        assert!(s.contains("A"));
61        assert!(s.contains("B"));
62    }
63
64    #[test]
65    fn from_vec_creates_validation_failed() {
66        let errors = vec![ValidationError::DuplicateNode {
67            name: "X".to_string(),
68        }];
69        let err: GraphError = errors.into();
70        assert!(matches!(err, GraphError::ValidationFailed(_)));
71    }
72
73    #[test]
74    fn error_trait_impl() {
75        let err = GraphError::ValidationFailed(vec![]);
76        // std::error::Error is implemented — source() returns None
77        let _: &dyn std::error::Error = &err;
78    }
79
80    #[test]
81    fn debug_impl() {
82        let err = GraphError::ValidationFailed(vec![]);
83        let s = format!("{err:?}");
84        assert!(s.contains("ValidationFailed"));
85    }
86}
injectable_rs_graph/error.rs

injectable_rs_graph/
error.rs
