Test fonts twardoch/test-fonts

  1. Home
  2. Nadyezhda SL One

Nadyezhda SL One

Test font in OpenType TT (.ttf) format

Digital data copyright (c) 2007 by Adam Twardoch. Based on Bitstream Vera Mono, copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Licensed under the Bitstream Vera license.

This font is a special version of the Bitstream Vera Mono font, originally designed by Jim Lyles. This version has been reworked by Adam Twardoch.

The fonts is located in the ttf folder.

This font is intended for testing of OpenType Layout features support in an application. Using a special test string (see below), the user can selectively turn on and off OpenType features in the application’s UI and observe which OpenType feature tags are being applied to the text. Each feature includes one lookup that substitutes two particular Latin lowercase letters with a special glyph that shows the feature tag associated with that feature. The result in a test app would look like the following:

Nadyezhda SL One test result

The font implements all OpenType feature tags registered in the OpenType specification version 1.4, as well as two unregistered tags: ss21 and ss22. All lookups are GSUB LookupType 4 (ligature) lookups and are registered in the Latin (latn) default languagesystem.

Note that many OpenType Layout features should not be implemented this way in real-world fonts. For example, the nukt (Nukta form) feature only makes sense when registered in an Indic script, not in the Latin script. Many of these features should be applied automatically in certain language/script contexts by the OpenType Layout engine, and this font is not suitable for testing such behavior. Also, the recommended implementation for many features is to include positioning lookups rather than substitution lookups, and this font also does not fulfil these expectations.

Nonetheless, the font is useful for testing issues such as:

  • What feature tags does my application apply by default, without any user interaction?
  • When triggering a particular UI item for applying a certain feature, is the expected feature being actually applied?
  • Does my application have human-readable UI labels for all possible OpenType features?
  • Are the human-readable UI labels for OpenType features localized into other languages in a sensible way?

“Nadyezhda” is Russian for “Hope”. Along with “Vera” (which was also the original name for this typeface, and is Russian for “Faith”) and with “Lyubov” (“Love”), they form the three Biblical virtues, and rank among the most popular Russian female given names.

The special test string is:

aa ab ac ad ae af ag ah ai aj ak al am
an ao ap aq ar as at au av aw ax ay az
ba bb bc bd be bf bg bh bi bj bk bl bm
bn bo bp bq br bs bt bu bv bw bx by bz
ca cb cc cd ce cf cg ch ci cj ck cl cm
cn co cp cq cr cs ct cu cv cw cx cy cz
da db dc dd de df dg dh di dj dk dl dm
dn do dp dq dr ds dt du dv dw dx dy dz
ea eb ec ed ee ef eg eh ei ej ek el em
en eo ep eq er es et eu ev ew ex ey ez

You can also consult the FEA source code for the features defined in the font.