bashrs 6.66.0

Rust-to-Shell transpiler for deterministic bootstrap scripts
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use super::*;
use crate::tracing::{ParseEvent, Span};

// ===== UNIT TESTS (RED PHASE) =====

/// Test: TRACE-002-001 - Buffer creation with default capacity
#[test]
fn test_trace_002_001_default_capacity() {
    let buffer = CircularTraceBuffer::new();
    assert_eq!(buffer.capacity(), 1024);
    assert_eq!(buffer.len(), 0);
    assert!(buffer.is_empty());
}

/// Test: TRACE-002-002 - Buffer creation with custom capacity
#[test]
fn test_trace_002_002_custom_capacity() {
    let buffer = CircularTraceBuffer::with_capacity(512);
    assert_eq!(buffer.capacity(), 512);
}

/// Test: TRACE-002-003 - Push event into buffer
#[test]
fn test_trace_002_003_push_event() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert_eq!(buffer.len(), 1);
    assert_eq!(buffer.total_events(), 1);
}

/// Test: TRACE-002-004 - Eviction when capacity reached
#[test]
fn test_trace_002_004_eviction() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);

    // Push 3 events (capacity is 2, so oldest will be evicted)
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test1.sh".to_string(),
        line: 1,
        col: 1,
    }));
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test2.sh".to_string(),
        line: 1,
        col: 1,
    }));
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test3.sh".to_string(),
        line: 1,
        col: 1,
    }));

    assert_eq!(buffer.len(), 2); // Still at capacity
    assert_eq!(buffer.total_events(), 3); // But 3 events recorded
    assert_eq!(buffer.evicted_count(), 1); // 1 evicted
}

/// Test: TRACE-002-005 - Retention rate calculation
#[test]
fn test_trace_002_005_retention_rate() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);

    // Empty buffer: 100% retention
    assert_eq!(buffer.retention_rate(), 1.0);

    // Push 2 events: 100% retention (no evictions)
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test1.sh".to_string(),
        line: 1,
        col: 1,
    }));
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test2.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert_eq!(buffer.retention_rate(), 1.0);

    // Push 1 more: 66.7% retention (1 evicted out of 3 total)
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test3.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert!((buffer.retention_rate() - 0.6667).abs() < 0.01);
}

/// Test: TRACE-002-006 - Buffer utilization
#[test]
fn test_trace_002_006_utilization() {
    let mut buffer = CircularTraceBuffer::with_capacity(4);
    assert_eq!(buffer.utilization(), 0.0);

    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert_eq!(buffer.utilization(), 0.25);

    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert_eq!(buffer.utilization(), 0.5);
}

/// Test: TRACE-002-007 - is_full check
#[test]
fn test_trace_002_007_is_full() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);
    assert!(!buffer.is_full());

    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert!(!buffer.is_full());

    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    assert!(buffer.is_full());
}

/// Test: TRACE-002-008 - Clear buffer
#[test]
fn test_trace_002_008_clear() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));

    assert_eq!(buffer.len(), 2);
    buffer.clear();
    assert_eq!(buffer.len(), 0);
    assert_eq!(buffer.total_events(), 0);
}

/// Test: TRACE-002-009 - Iterator over events
#[test]
fn test_trace_002_009_iterator() {
    let mut buffer = CircularTraceBuffer::with_capacity(3);
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test1.sh".to_string(),
        line: 1,
        col: 1,
    }));
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test2.sh".to_string(),
        line: 1,
        col: 1,
    }));

    let events: Vec<_> = buffer.iter().collect();
    assert_eq!(events.len(), 2);
}

/// Test: TRACE-002-010 - Filtered iterator by significance
#[test]
fn test_trace_002_010_filtered_iterator() {
    let mut buffer = CircularTraceBuffer::with_capacity(10);

    // Add events with different significances
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    })); // Trace significance

    buffer.push(TraceEvent::Parse(ParseEvent::ParseError {
        error: "Syntax error".to_string(),
        span: Span::single_line(1, 1, 10),
    })); // High significance

    // Filter for HIGH+ events
    let high_events: Vec<_> = buffer.iter_filtered(TraceSignificance::High).collect();
    assert_eq!(high_events.len(), 1);
}

/// Test: TRACE-002-011 - Buffer statistics
#[test]
fn test_trace_002_011_stats() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));

    let stats = buffer.stats();
    assert_eq!(stats.capacity, 2);
    assert_eq!(stats.current_size, 1);
    assert_eq!(stats.total_events, 1);
    assert_eq!(stats.utilization, 0.5);
}

/// Test: TRACE-002-012 - Serialization round-trip
#[test]
fn test_trace_002_012_serialization() {
    let mut buffer = CircularTraceBuffer::with_capacity(2);
    buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
        source: "test.sh".to_string(),
        line: 1,
        col: 1,
    }));

    let json = serde_json::to_string(&buffer).expect("Serialization failed");
    let deserialized: CircularTraceBuffer =
        serde_json::from_str(&json).expect("Deserialization failed");

    assert_eq!(buffer.len(), deserialized.len());
    assert_eq!(buffer.capacity(), deserialized.capacity());
}

// ===== PROPERTY TESTS =====

#[cfg(test)]
mod property_tests {
    use super::*;
    use proptest::prelude::*;

    // Property: Buffer never exceeds capacity
    proptest! {
        #[test]
        fn prop_trace_002_never_exceeds_capacity(
            capacity in 1usize..1000,
            push_count in 1usize..2000,
        ) {
            let mut buffer = CircularTraceBuffer::with_capacity(capacity);

            for i in 0..push_count {
                buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
                    source: format!("test{}.sh", i),
                    line: 1,
                    col: 1,
                }));
            }

            // Property: Buffer never exceeds capacity
            prop_assert!(buffer.len() <= capacity);
        }
    }

    // Property: Retention rate is always between 0.0 and 1.0
    proptest! {
        #[test]
        fn prop_trace_002_retention_rate_bounds(
            capacity in 1usize..100,
            push_count in 1usize..200,
        ) {
            let mut buffer = CircularTraceBuffer::with_capacity(capacity);

            for i in 0..push_count {
                buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
                    source: format!("test{}.sh", i),
                    line: 1,
                    col: 1,
                }));
            }

            let rate = buffer.retention_rate();
            // Property: Retention rate in [0.0, 1.0]
            prop_assert!((0.0..=1.0).contains(&rate));
        }
    }

    // Property: Total events always >= current size
    proptest! {
        #[test]
        fn prop_trace_002_total_vs_current(
            capacity in 1usize..100,
            push_count in 1usize..200,
        ) {
            let mut buffer = CircularTraceBuffer::with_capacity(capacity);

            for i in 0..push_count {
                buffer.push(TraceEvent::Parse(ParseEvent::ParseStart {
                    source: format!("test{}.sh", i),
                    line: 1,
                    col: 1,
                }));
            }

            // Property: Total events >= current size (monotonic)
            prop_assert!(buffer.total_events() >= buffer.len() as u64);
        }
    }
}