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Preview of NetCDF Time Axes: Epochs, Units and Calendars (.nc)
nc
808 B
Actual file preview for NetCDF Time Axes: Epochs, Units and Calendars (.nc)

NetCDF Time Axes: Epochs, Units and Calendars (.nc)

Three CF time coordinates over the same six records: hours from the Unix epoch, days from 2026-01-01, and the same days under a 365_day calendar. A decoder that assumes one epoch, or ignores the calendar attribute, dates the records wrongly without raising anything.

File
NC · Gridded · 6 records
Use case
Scientific dataSerialization testing· Conversion set
Preview of NetCDF Unlimited Record Dimension (.nc)
nc
572 B
Actual file preview for NetCDF Unlimited Record Dimension (.nc)

NetCDF Unlimited Record Dimension (.nc)

A NetCDF-3 file with a genuine unlimited record dimension, so the record variable is stored interleaved rather than contiguously while the fixed-size station variable is not. It exercises the striding path that a reader written only against fixed dimensions gets wrong.

File
NC · Gridded · 5 records
Use case
Scientific dataSerialization testing· Conversion set
Preview of Newick Tree: Branch Lengths and Support Values (.nwk)
nwk
136 B
Actual file preview for Newick Tree: Branch Lengths and Support Values (.nwk)

Newick Tree: Branch Lengths and Support Values (.nwk)

A six-taxon Newick tree with branch lengths on every edge and bootstrap-style support values written as internal node labels. That support notation is ambiguous by design in Newick (the same position can hold a node name), which is precisely what a parser has to decide about.

File
NWK · Bioinformatics
Use case
Scientific dataEditor testing· Paired fixture
Preview of Newick Tree: Topology Only, No Branch Lengths (.nwk)
nwk
57 B
Actual file preview for Newick Tree: Topology Only, No Branch Lengths (.nwk)

Newick Tree: Topology Only, No Branch Lengths (.nwk)

The identical tree topology with every branch length and support value stripped, which is what a Newick writer produces when the source tree has no lengths. Comparing the two proves a parser distinguishes 'length zero' from 'no length recorded'.

File
NWK · Bioinformatics
Use case
Scientific dataEditor testing+1· Paired fixture
Preview of Newsletter Preference Centre (HTML)
html
6.9 KB
Actual file preview for Newsletter Preference Centre (HTML)

Newsletter Preference Centre (HTML)

A preference centre with six topic checkboxes, a frequency radio group and a master unsubscribe control that must override every other choice. The override interaction is the behaviour worth testing here.

File
HTML · Marketing · 5 fields
Preview of Newsletter Template (DOCX)
docx
36.2 KB
Actual file preview for Newsletter Template (DOCX)

Newsletter Template (DOCX)

A company newsletter as an editable Word document with a masthead and three short articles, twinned with an HTML email version of the same content.

File
DOCX · Newsletter
Use case
TemplatesConversion testing· Conversion set
Preview of Newsletter Template (HTML Email)
html
2.7 KB
Actual file preview for Newsletter Template (HTML Email)

Newsletter Template (HTML Email)

The newsletter as a responsive, table-based HTML email with inline styles: a masthead, three articles, and a call-to-action button. Opens in the in-browser editor; twin of the DOCX version.

File
HTML · Newsletter
Use case
TemplatesEditor testing· Conversion set
Preview of Nginx Access Log
log
398 B
Actual file preview for Nginx Access Log

Nginx Access Log

An nginx combined-format access log with several requests, including a 403 and a 404, for testing log parsers.

File
LOG · Logs · 4 records
Use case
Log parsing
Preview of NMEA 0183: Bad Checksum and Truncated Sentence
nmea
755 B
Actual file preview for NMEA 0183: Bad Checksum and Truncated Sentence

NMEA 0183: Bad Checksum and Truncated Sentence

A log with one sentence whose checksum has been altered and a final sentence truncated mid-transmission with no checksum at all: the two ways a serial GPS feed actually degrades. A correct parser drops both and keeps everything else.

File
NMEA · Nmea · ASCII
Use case
GeospatialError handling+1· Conversion set
Preview of NMEA 0183: GGA Sentences Only
nmea
852 B
Actual file preview for NMEA 0183: GGA Sentences Only

NMEA 0183: GGA Sentences Only

The same twelve fixes reduced to GGA alone. GGA carries time-of-day but no date and no speed, so a parser that only reads GGA cannot place the track on a calendar: a real limitation that this file makes obvious rather than leaving to be discovered later.

File
NMEA · Nmea · ASCII
Use case
GeospatialTime-series data+1· Conversion set
Preview of NMEA 0183: LF Line Endings Instead of CRLF
nmea
930 B
Actual file preview for NMEA 0183: LF Line Endings Instead of CRLF

NMEA 0183: LF Line Endings Instead of CRLF

The same sentences terminated with a bare LF rather than the CR LF the standard mandates: what you get after a log passes through a text editor or a Unix pipeline. Parsers that strip only "\r\n" leave a stray character on every line and then fail the checksum.

File
NMEA · Nmea · ASCII
Use case
GeospatialError handling+1· Conversion set
Preview of NMEA 0183: Mixed GGA/RMC/GSA/GSV/VTG Log
nmea
3.2 KB
Actual file preview for NMEA 0183: Mixed GGA/RMC/GSA/GSV/VTG Log

NMEA 0183: Mixed GGA/RMC/GSA/GSV/VTG Log

A twelve-fix receiver log with the five sentence types a GPS unit normally interleaves, including three-part GSV satellite-in-view sets. Every checksum is correct, so a parser that verifies them should accept the whole file.

File
NMEA · Nmea · ASCII
Use case
GeospatialTime-series data+1· Conversion set
Preview of NMEA 0183: Receiver With No Fix
nmea
924 B
Actual file preview for NMEA 0183: Receiver With No Fix

NMEA 0183: Receiver With No Fix

Six cycles of a receiver that has power but no satellite lock: GGA fix quality 0, RMC status V, and empty coordinate fields throughout. Parsers that split on commas and index positionally read these empty fields as zeros and plot the track at Null Island.

File
NMEA · Nmea · ASCII
Use case
GeospatialError handling+1· Conversion set
Preview of NMEA 0183: Southern and Eastern Hemisphere Indicators
nmea
1.8 KB
Actual file preview for NMEA 0183: Southern and Eastern Hemisphere Indicators

NMEA 0183: Southern and Eastern Hemisphere Indicators

NMEA never writes a negative coordinate: sign lives entirely in the N/S and E/W letters, and the numeric field is always positive. This log sits in the southern and eastern hemispheres, so a parser that ignores the hemisphere letter puts every fix in the wrong quadrant of the world.

File
NMEA · Nmea · ASCII
Use case
GeospatialError handling+1· Conversion set
Preview of Node.js Stack Trace (log)
log
551 B
Actual file preview for Node.js Stack Trace (log)

Node.js Stack Trace (log)

A realistic Node.js/Express stack trace, a TypeError with V8-style 'at function (file:line:col)' frames including an async frame and internal node: frames. A fixture for testing JS stack-trace parsers.

File
LOG · Logs · 7 frames
Use case
Log parsingError handling· Conversion set
Preview of Non-Gregorian Calendar Eras: Japanese, ROC, Buddhist, Hijri, Hebrew
json
2 KB
Actual file preview for Non-Gregorian Calendar Eras: Japanese, ROC, Buddhist, Hijri, Hebrew

Non-Gregorian Calendar Eras: Japanese, ROC, Buddhist, Hijri, Hebrew

Era and era-year for one instant across five calendar systems. The three whose months and days align with the Gregorian calendar, Japanese (Reiwa 8), ROC (Minguo 115) and Thai Buddhist (2569), carry a full rendered date; the Hijri and Hebrew entries carry the year only, because their day and month depend on the calculation variant and, for Hijri, on observation. Saying so is the point of the fixture.

File
JSON · Formatting
Preview of Normal Diff - ed-Style Change Commands
diff
80 B
Actual file preview for Normal Diff - ed-Style Change Commands

Normal Diff - ed-Style Change Commands

The default output of bare `diff`: ed-style commands such as `3a4` with `<` and `>` bodies and no file headers at all. Tooling that identifies diffs by looking for `---`, `+++` or `@@` cannot even tell this is a diff, which is exactly what makes it a useful negative fixture.

File
DIFF · Diffs · UTF-8
Use case
Error handlingVisual diff / regression+1· Conversion set