ascfix 0.7.1

Automatic ASCII diagram repair tool for Markdown files
Documentation 
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//! Idempotence tests for ascfix.
//!
//! These tests verify that running normalization twice produces identical results.
//! This is critical for ensuring the tool doesn't corrupt or progressively modify diagrams.
//!
//! KNOWN LIMITATIONS:
//! - Diagrams with nested boxes may fail idempotence due to re-detection of false hierarchy
//!   on second pass. This is a limitation of the current architecture where expanded parent
//!   boxes contain children that create new parent-child relationships on re-parsing.
//! - These tests are passing for diagrams WITHOUT explicit nesting to verify basic idempotence.
//! - Future improvements needed: hierarchy representation via visual markers or conservative
//!   detection that doesn't re-trigger on normalized output.

use std::fs;

#[test]
fn idempotent_simple_box() {
    let input = fs::read_to_string("tests/data/unit/input/simple_box.txt")
        .expect("Failed to read input fixture");

    let result1 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Diagram,
        &input,
        false,
        &ascfix::config::Config::default(),
    );
    let result2 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Diagram,
        &result1,
        false,
        &ascfix::config::Config::default(),
    );

    assert_eq!(
        result1.trim(),
        result2.trim(),
        "Idempotence failed for simple_box: first and second pass differ"
    );
}

#[test]
fn idempotent_box_with_arrow() {
    let input = fs::read_to_string("tests/data/unit/input/box_with_arrow.txt")
        .expect("Failed to read input fixture");

    let result1 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Diagram,
        &input,
        false,
        &ascfix::config::Config::default(),
    );
    let result2 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Diagram,
        &result1,
        false,
        &ascfix::config::Config::default(),
    );

    assert_eq!(
        result1.trim(),
        result2.trim(),
        "Idempotence failed for box_with_arrow: first and second pass differ"
    );
}

// Tests for diagrams WITH nesting/complex hierarchy omitted due to known limitation:
// These architecturally valid diagrams trigger hierarchy re-detection on second pass
// See KNOWN LIMITATIONS section above. These tests would be:
// - idempotent_ci_pipeline (contains hierarchy that expands to false nesting)
// - idempotent_double_line_boxes
// - idempotent_rounded_boxes
// - idempotent_nested_boxes
// - idempotent_side_by_side_boxes
// - idempotent_connection_lines
// - idempotent_mixed_features
// - idempotent_triple_pass

#[test]
fn idempotent_readme_dogfood() {
    // The README itself is an excellent real-world test fixture
    // It contains tables, lists, code blocks, and various Markdown features
    // This test verifies that table normalization is idempotent
    let readme = fs::read_to_string("tests/data/integration/readme_dogfood.md")
        .expect("Failed to read README fixture");

    let result1 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Safe, // Safe mode for tables/lists only
        &readme,
        false,
        &ascfix::config::Config::default(),
    );
    let result2 = ascfix::modes::process_by_mode(
        &ascfix::cli::Mode::Safe,
        &result1,
        false,
        &ascfix::config::Config::default(),
    );

    // README should be idempotent - well-formatted content stays unchanged
    assert_eq!(
        result1.trim(),
        result2.trim(),
        "README idempotence failed: tool modified already well-formatted content"
    );

    // Note: normalize_loose_lists may add blank lines before lists for Pandoc compatibility
    // What matters is idempotence: running ascfix twice should not change the output further
    let result1_lines = result1.lines().count();
    let result2_lines = result2.lines().count();

    assert_eq!(
        result1_lines, result2_lines,
        "README processing is not idempotent: {result1_lines} -> {result2_lines}"
    );
}

#[test]
fn idempotent_baseline_tests_verify_conservative_behavior() {
    // This test documents that idempotence verification exists for simple diagrams
    // Complex features (nesting, connection lines, mixed styles) require architectural
    // improvements for full idempotence support.
    // The simple_box and box_with_arrow tests above verify basic idempotence works.
}