Gitignore - The Working Form of the Same Negation
The corrected twin: `build/*` excludes the directory's contents instead of the directory, so git still descends and `!build/keep.txt` re-includes the file. The two fixtures differ by two characters and produce opposite results, which makes them a precise pass/fail pair for an ignore engine.
# The fix: exclude the CONTENTS of the directory, not the directory itself,
# so git still descends and the re-inclusion below can match.
build/*
!build/keep.txt
coverage/*
!coverage/summary.json
Specifications
- Seed
- 20260807
- Repository Name
- .gitignore
- Patterns
- 4
- Negations
- 2
- Negations That Take Effect
- 2
- Line Endings
- LF
- Encoding
- UTF-8
Testing contract
Expected to pass- Scenario
- Run the same four queries against this twin as against the trap fixture.
- Expected result
- build/keep.txt and coverage/summary.json are NOT ignored, while build/bundle.js and coverage/lcov.info still are.
What is a .gitignore file?
A .gitignore file tells Git which untracked paths to leave alone. Each line is a pattern: a leading `/` anchors it to the containing directory, a trailing `/` restricts it to directories, `!` re-includes a previously excluded path, `**` matches across directory boundaries, and `#` introduces a comment. Rules are evaluated in order, with the last matching pattern winning, and nested .gitignore files layer on top of parent ones.
How to use this file
Use an example .gitignore file to test ignore-pattern engines in build tools, bundlers, linters, and container builders, checking negation ordering, anchored versus floating patterns, and directory-only rules against a documented set of expected matches.
How to use this file for testing
“Gitignore - The Working Form of the Same Negation” is a deterministic Novus Examples fixture for Config parsing, Config testing, Visual diff / regression. TOML and INI configuration files with nested sections and typed values — for testing config parsers and loaders.
Documented properties for this file: seed 20260807 · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
Diff and patch fixtures name their target paths and the exact edge case they exercise — rename, mode change, binary hunk, CRLF↔LF, or missing trailing newline. Apply or render them against the documented before-state; every author, path, and hash is fictional.
Point your config loader at the file and assert it reads the documented sections and typed values, including any deliberately-tricky nesting or comments.
Related files
- txtCODEOWNERS - Overlapping Globs With Documented WinnersDeliberately overlapping rules so every interesting path matches two or three of them, which is the only way to test that a resolver applies last-match-wins rather than most-specific-wins. One rule has no owners at all, which clears inherited ownership instead of adding any.
- gitattributesGitattributes - LFS Filters, Linguist Hints and export-ignoreThe non-EOL half of the format: LFS filter/diff/merge triples, `linguist-generated` and `linguist-vendored` hints that hide files from language statistics and review, `export-ignore` entries that drop paths from `git archive`, and a `merge=union` driver for an append-only changelog. Attribute values are unquoted and space-separated, so column alignment is whitespace a parser must collapse.
- gitconfigGitconfig - includeIf Conditions in Four FlavoursEvery conditional-include form git supports — path prefix, case-insensitive path prefix, branch glob, and a condition on an existing remote URL — plus one unconditional include. Order matters: a later include overrides an earlier one, so a parser that gathers includes into a set rather than a list resolves the wrong identity.
- gitconfigGitconfig - Sections, Quoted Subsections and Shell AliasesA realistic global config exercising the whole INI-like grammar: bracketed sections, quoted subsection names that are case-sensitive while section names are not, values with size suffixes, a shell alias whose leading `!` changes how the rest is executed, and both comment characters.
- gitignoreGitignore - Escaped #, !, Bracket and Trailing SpaceEvery escape the format defines, including the one nobody expects: a trailing space is stripped from a pattern unless it is backslash-escaped, so `draft\ ` and `draft` ignore different files. Editors that trim trailing whitespace on save silently change what this file means.
- gitignoreGitignore - Globstar, Anchors and Character ClassesOne pattern per rule in the gitignore grammar: a leading slash that anchors to the containing directory, the same name unanchored, `**` in all three positions, `?` and `[...]` classes, and a trailing slash that matches only directories. Every line is a separate assertion for a matcher's test suite.
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