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An OPML 2.0 subscription list with nested outline groups and three feed entries (title, xmlUrl, htmlUrl): the format RSS readers use to import and export subscriptions, for testing OPML parsers.
The clip as Opus: the modern low-latency codec used by WebRTC and streaming. Browser-playable; for testing Opus decoding and conversion.
The same employee table as Apache ORC: the columnar format common in the Hive/Hadoop ecosystem. For testing ORC readers and Parquet↔ORC conversion.
An order-confirmation / receipt email (multipart/alternative) with an itemised order table in both text and HTML: a transactional-email fixture for testing parsing and data extraction.
A fictional business contact with structured organization and postal-address fields for CRM migration tests. This member uses vCard 2.1 syntax.
A fictional business contact with structured organization and postal-address fields for CRM migration tests. This member uses vCard 3.0 syntax.
A fictional business contact with structured organization and postal-address fields for CRM migration tests. This member uses vCard 4.0 syntax.
The `.orig` backup GNU patch writes beside a file it has modified: the exact pre-patch content, kept so a failed application can be unwound. Paired with the .rej fixture, it is the complete state a developer actually finds after a patch goes wrong.
Intentionally corrupt. Every label carries a for attribute naming an element that is not in the document, and two controls share one id, so no control has a computed accessible name from its label. An accessibility scanner should report five unnamed controls and one duplicate id.
Intentionally invalid: a way referencing node -9 and a relation referencing way -999, neither of which is in the file. This is the normal state of a bounding-box extract, where objects are clipped at the boundary, so a reader has to decide between rejecting the file and building partial geometry, and must say which.
Wither Lake and its island as an OSM multipolygon relation: two closed ways tagged separately and joined by a relation whose members carry outer and inner roles. OSM has no polygon primitive at all, so reconstructing the hole means reading the relation rather than the ways.
An intentionally invalid OSV record: the JSON parses, but the required id is missing, modified is not an RFC 3339 timestamp, the SEMVER range has a fixed event with no introduced event, and severity.score is a number where the schema demands a CVSS vector string. Advisory identifiers use the invented NOVUS-SAMPLE namespace with SAMPLE-CVE aliases; no identifier here refers to a published CVE, GHSA or OSV record, and no package named exists.
A single OSV-schema advisory record for a fictional package, with a SEMVER range expressed as introduced/fixed events rather than as a version string: the part naive parsers get wrong. Advisory identifiers use the invented NOVUS-SAMPLE namespace with SAMPLE-CVE aliases; no identifier here refers to a published CVE, GHSA or OSV record, and no package named exists.
All four SAMPLE advisories as newline-delimited OSV records: the bulk shape an advisory database is loaded from, where each line must parse independently. Advisory identifiers use the invented NOVUS-SAMPLE namespace with SAMPLE-CVE aliases; no identifier here refers to a published CVE, GHSA or OSV record, and no package named exists.
An OSV-Scanner report that nests full OSV records under each affected package and adds the groups array that collapses aliases into one finding: the structure de-duplication depends on. Advisory identifiers use the invented NOVUS-SAMPLE namespace with SAMPLE-CVE aliases; no identifier here refers to a published CVE, GHSA or OSV record, and no package named exists.
The same design in CFF outlines: cubic Type 2 charstrings with no glyf and no loca. The half of the pair that catches code assuming every OpenType font is TrueType-flavoured. Original typeface, free to use.
COLR and CPAL over CFF rather than glyf outlines. COLR is outline-agnostic by specification, but plenty of tooling assumes colour fonts are TrueType-flavoured: this is the file that finds out. Original typeface, free to use.
The Novus Sans Sample demonstration typeface as OpenType/CFF outlines: one member of a TTF/OTF/WOFF/WOFF2 conversion set built from scratch with fontTools. Original and free to use; a fixture for testing font loading, subsetting, and conversion.
A variable font whose outlines are CFF2 rather than glyf, so the variation deltas live inside blended charstrings and there is no gvar table at all. The case that breaks tools which assume every variable font is TrueType-flavoured. Original typeface, free to use.
The uncompressed CFF (Type 2) source for this container set. Every WOFF and WOFF2 file in the group is packed from exactly these bytes, so a compression comparison is measuring the container and nothing else. Original typeface, free to use.
An OTLP logs export across two resources: five records spanning DEBUG to FATAL with both severityNumber and severityText, separate event and observed timestamps, trace and span correlation, and one record whose body is a full multi-line Python traceback.
The same five OTLP log records reframed as one self-contained export per line, with the resource attributes repeated on every line. The trade a line-oriented sink makes: each line stands alone, at the cost of repeating the resource block five times.
An exponential histogram at scale 3 (eight buckets per power of two) with a negative offset, a zero bucket and its threshold. Bucket i covers (base^(offset+i), base^(offset+i+1)], and getting that indexing wrong silently shifts every percentile, which is what this fixture is for.
A monotonic counter that drops from 94,880 to 1,120 when its process restarts, with startTimeUnixNano changing at exactly that point to mark the reset. Rate calculations that subtract consecutive values without checking the start timestamp produce a large negative rate here.
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