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OpenTAP 9.34 Available

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Releases
OpenTAP release banner - celebration.

The international team of OpenTAP developers has been very busy over the last year, issuing five new releases since October 2025. Below, find the highlights from versions 9.30 through the current version, 9.34:

OpenTAP 9.34

The newest published OpenTAP version is a maintenance release focusing on performance and stability.

Performance

  • Editing sweeps with many parameters is now significantly faster #2379

  • Image resolution is now significantly faster for non-resolving images #2398

Minor Improvements

  • macOS support is now enabled by default for newly created plugins. #2393

Bug Fixes

  • Fixed an installation lock bug on macOS which would lead to a bricked installation if an OpenTAP process crashed hard while holding the lock.

  • Fixed installation lock issues on Linux and macOS which allowed simultaneous lock acquisition when more than two processes are involved: #2405

  • Fixed a deadlock in the post-run of composite runs: #2371

  • Fixed break conditions not triggering for steps using Defer: #2387

  • Fixed a race condition causing issues in some circumstances when using EmbedPropertiesAttribute: #2395

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OpenTAP 9.33

OpenTAP 9.33 focuses on cross-platform stability, performance, and quality-of-life improvements.

Major Features

Parameterization of Outputs — outputs can now be parameterized, useful for surfacing key values from a sub-sequence of steps through the rest of the test plan.

Safer test plan saving — saves now write to a temporary file first, then use delete-and-move to replace the original, protecting against corruption from connection or power loss.

Minor Features

  • OPENTAPLIBVISALOCATION can specify a custom libvisa shared library location

  • tap sdk gitversion now works on Alpine Linux

Bug fixes

  • Test plan no longer gets stuck on parameter resolution error #2307

  • Test plan / step run parameters now support full groups

  • Memory leak fixed when creating many dynamic test step types #2318

  • SDK read-only list example no longer causes a stack overflow from the added Equals override.

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OpenTAP 9.32.3

OpenTAP 9.32.3 offers stability, performance, and quality-of-life release; rolls up patches from 9.32.1–9.32.3.

Multi-level nested sweeps — Parameter Sweep values can now themselves be swept, enabling multi-level sweeps.

Performance — extensive gains in number/range parsing from text, faster value cloning, and quicker multi-select of many steps.

Improvements

  • Embedded settings can now be parameterized, and now forward validation errors

  • Number/range parsing improvements speed up UI and XML loading

  • Trivial object cloning improved, boosting multi-select and parameter performance

  • ILoopStep API marks a step as a loop step with get/set access to the current iteration

Bug fixes

  • Parameterized embedded properties now deserialize correctly

  • Process Step no longer adds an extra newline to output

  • Settings load no longer throws if ComponentSettings.Initialize errors

  • Newlines in the session log now render as spaces instead of being stripped

  • tap package install Editor works even when a file named "Editor" exists

  • tap sdk gitversion now works with git worktrees

  • Custom annotators throwing in their constructor no longer break other annotators

9.32.1 – 9.32.3 patch notes

  • Disabled Sweep Parameter iterations no longer lock up the test plan #2277

  • Errors loading assemblies with no Location set #2288

  • Errors raised from a PreRunMixin now fail the test plan early #2300

  • Package download file no longer truncated on app crash mid-copy #2302

  • TimeSpanAnnotation initializes Errors as null #2306

  • Busy instruments no longer break VISA address validation #2309

  • PreTestPlanRunMixins now have access to the TestPlanRun #2292

  • Hardlink implementation aligned between Mac and Linux

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OpenTAP 9.31.1

OpenTAP 9.31: package servicing improvements and several reliability fixes.

Features

  • Packages can now be updated or removed even while their files are in use

Bug fixes

  • Test plans can now be saved even if a custom serializer throws an unhandled exception

  • Added missing OpenTapApiReference documentation on Linux / macOS

  • tap.dll now correctly updates when OpenTAP is updated

  • Artifacts from custom stream types saved incorrectly in some cases — fixed

  • CLI User Input no longer hangs if triggered during an offline update check

  • Race condition causing crashes/deadlocks during Editor startup and plugin search — fixed

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OpenTAP 9.30

OpenTAP 9.30 is API-focused release adding custom name formatting and a neutral display-attribute variant.

Custom name formatting — test steps can implement IFormatName to control name formatting before macro expansion runs.

Neutral DisplayAttribute variant — a new NeutralDisplayAttribute property retrieves the language-neutral form of a DisplayAttribute.

Bug fixes

  • Fixed deadlock issues when waiting for output from test steps stopped by break conditions