lemma-engine 0.8.13

A language that means business.
Documentation 
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use crate::engine::Engine;
use crate::SourceType;

#[test]
fn invalid_parent_type_in_type_definition_should_be_rejected() {
    let mut engine = Engine::new();
    let code = r#"
spec test
data invalid: nonexistent -> minimum 0
data value: invalid
rule result: value
"#;

    let result = engine.load(
        code,
        SourceType::Path(std::sync::Arc::new(std::path::PathBuf::from("test.lemma"))),
    );
    assert!(result.is_err(), "Engine should reject invalid parent types");

    let load_err = result.unwrap_err();
    assert!(!load_err.errors.is_empty(), "expected at least one error");
    let msg = load_err.errors[0].to_string();
    assert!(
        msg.contains("Unknown parent 'nonexistent'"),
        "Error should mention unknown type. Got: {}",
        msg
    );
}

#[test]
fn unknown_type_used_in_data_definition_should_be_rejected() {
    let mut engine = Engine::new();
    let code = r#"
spec test
data value: invalid_parent_type
rule result: value
"#;

    let result = engine.load(
        code,
        SourceType::Path(std::sync::Arc::new(std::path::PathBuf::from("test.lemma"))),
    );
    assert!(
        result.is_err(),
        "Engine should reject unknown types used in type declarations"
    );

    let load_err = result.unwrap_err();
    assert!(!load_err.errors.is_empty(), "expected at least one error");
    let msg = load_err.errors[0].to_string();
    assert!(
        msg.contains("Unknown parent 'invalid_parent_type'"),
        "Error should mention unknown type. Got: {}",
        msg
    );
}

#[test]
fn duplicate_spec_versions_same_effective_should_be_rejected() {
    let mut engine = Engine::new();
    let code = r#"
spec test
data x: 1

spec test
data x: 2
"#;

    let result = engine.load(
        code,
        SourceType::Path(std::sync::Arc::new(std::path::PathBuf::from("test.lemma"))),
    );
    assert!(
        result.is_err(),
        "Duplicate spec rows for same identity should be rejected (no silent overwrites)"
    );
    let load_err = result.unwrap_err();
    assert!(!load_err.errors.is_empty(), "expected at least one error");
    let msg = load_err.errors[0].to_string();
    assert!(
        msg.contains("Duplicate spec") && msg.contains("test"),
        "Error should mention the duplicate spec name. Got: {}",
        msg
    );
}