fortsh Interactive Test Suite - Complete Summary

Date: 2025-11-19 Total Tests Created: 321 Framework Status: Fully operational with session reuse

Phase Results Overview

*Note: Session reuse implemented - 10 tests per session with PS1 reset *Note: Autocomplete suggestions cause some buffer noise in test output *Note: All categories now complete without resource exhaustion

Test Framework

Files Created

• tests/interactive/run_tests.py - Main test runner
• tests/interactive/fortsh_pty.py - PTY wrapper for pexpect
• tests/interactive/utils/keys.py - Key sequence definitions
• tests/interactive/utils/matchers.py - Output matching utilities
• tests/interactive/conftest.py - pytest fixtures
• tests/interactive/README.md - Documentation

Test Specifications

• test_specs/posix.yaml - 119 tests (POSIX shell features)
• test_specs/line_editing.yaml - 49 tests
• test_specs/history.yaml - 37 tests
• test_specs/completion.yaml - 37 tests
• test_specs/signals_jobs.yaml - 40 tests
• test_specs/prompt_display.yaml - 39 tests

Resource Management

Successfully resolved PTY resource exhaustion with:

• Session reuse: Reuse PTY sessions for 10 tests, then rotate
• PS1 reset: Reset prompt between tests to avoid pollution
• Echo marker sync: Use unique markers to sync buffer state
• Aggressive cleanup (SIGTERM/SIGKILL, FD closing, waitpid)
• Garbage collection between tests
• 0.3s delay between tests
• Fresh sessions at category boundaries

Top Priority Issues Identified

Critical

1. Job control builtins (fg, bg) not working properly
2. Ctrl+C not returning to prompt after interrupt
3. Job specifier notation (%n, %%, %+) not implemented

High Priority

1. ANSI color codes in PS1 not processed
2. COLUMNS/LINES not updated after resize
3. Basic filename completion not triggering
4. Down arrow history navigation broken
5. Ctrl+G cancel not implemented
6. echo -n flag not working (prints "-n" literally)
7. Backslash line continuation not working

Medium Priority

1. History substitution (^old^new) not implemented
2. Tab cycling through completions not working
3. Common prefix completion not working
4. Exit status after Ctrl+C not set correctly

Features Working Well

POSIX Shell Core (93% passing)

• Variables and parameter expansion (${var:-}, ${#var}, etc.)
• Pipelines and redirections
• Control structures (if/for/while/case)
• Functions with arguments and local variables
• Arithmetic expansion
• Command substitution
• Subshells
• Globbing
• All major builtins (cd, test, printf, eval, source, etc.)

Line Editing

• Basic cursor movement (Ctrl+A/E/B/F)
• Word movement (Alt+B/F)
• Text deletion (Ctrl+K/U/W)
• Character operations (Ctrl+D/H/T)
• Kill ring (Ctrl+Y, Alt+Y)

History

• Up/Down arrow navigation
• Ctrl+P/N navigation
• Basic Ctrl+R search
• History expansion (!!, !-1, !string, !?string)
• Word designators (!!:0, !!:1, !!:$, !$, Alt+.)

Completion

• Command completion
• Directory completion
• Environment variable completion
• Completion after operators (|, ;, &&, ||)

Prompt

• All PS1 escapes (\u, \h, \w, \W, \t, \d, \s, !, #, \n, \, $)
• Unicode and emoji support
• Command substitution in prompt

Terminal

• Window resize handling
• Line wrapping
• Long output scrolling

Running the Tests

# Run all tests
tests/interactive/.venv/bin/python tests/interactive/run_tests.py \
  --fortsh /path/to/fortsh

# Run specific phase
tests/interactive/.venv/bin/python tests/interactive/run_tests.py \
  --fortsh /path/to/fortsh --spec history.yaml

# Generate report
tests/interactive/.venv/bin/python tests/interactive/run_tests.py \
  --fortsh /path/to/fortsh --report results.md

Next Steps

1. Fix critical job control issues
2. Implement ANSI escape code processing
3. Fix Ctrl+C signal handling
4. Improve completion functionality
5. Add Phase 1 basic tests (startup, exit, builtins)
6. Improve test timing for prompt tests