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[JUnit Platform] Document fixed.max-pool-size property
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With JUnit 5.9.2 we pull in junit-team/junit5#3044 which makes it
possible to limit the maximum number of threads used while
executing in parallel.

Closes: #2677
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@mpkorstanje
mpkorstanje committed Jan 12, 2023
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

### Added
- [Spring] Support Spring Boot 3 and Spring 6 ([#2644](https://github.com/cucumber/cucumber-jvm/pull/2644) M.P. Korstanje)
- [JUnit Platform] Support `cucumber.execution.parallel.config.config.fixed.max-pool-size` ([#2681](https://github.com/cucumber/cucumber-jvm/pull/2681) M.P. Korstanje)

### Changed
- [Core] Use a [message based JUnit XML Formatter](https://github.com/cucumber/cucumber-junit-xml-formatter) ([#2638](https://github.com/cucumber/cucumber-jvm/pull/2638) M.P. Korstanje)
Expand All @@ -21,6 +22,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

### Fixed
- [Core] Improve test step creation performance ([#2666](https://github.com/cucumber/cucumber-jvm/issues/2666), Julien Kronegg)
- [JUnit Platform] Use JUnit Platform 1.9.2 (JUnit Jupiter 5.9.2)


## [7.10.1] - 2022-12-16
### Fixed
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174 changes: 89 additions & 85 deletions cucumber-junit-platform-engine/README.md
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Expand Up @@ -194,18 +194,20 @@ strategy.
* `dynamic`: Computes the desired parallelism as `<available cores>` *
`cucumber.execution.parallel.config.dynamic.factor`.

* `fixed`: Set the desired parallelism to `cucumber.execution.parallel.config.fixed.parallelism`.
* `fixed`: Set `cucumber.execution.parallel.config.fixed.parallelism` to the
desired parallelism and `cucumber.execution.parallel.config.config.fixed.max-pool-size`
to the maximum pool size of the underlying ForkJoin pool.

* `custom`: Specify a custom `ParallelExecutionConfigurationStrategy`
implementation through `cucumber.execution.parallel.config.custom.class`.

If no strategy is specified Cucumber will use the `dynamic` strategy with a
factor of `1`.

Note: Cucumber does not guarantee that the number of concurrently executing
tests will not exceed the configured parallelism. The underlying `ForkJoinPool`
used to execute scenarios may spawn additional threads. To obtain such
guarantees us a custom parallel configuration strategy.
Note: While `.fixed.max-pool-size` effectively limits the maximum number of
concurrent threads, Cucumber does not guarantee that the number of concurrently
executing scenarios will not exceed this. See (junit5/#3108)[https://github.com/junit-team/junit5/issues/3108]
for details.

### Exclusive Resources ###

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documentation on Cucumber properties see [Constants](src/main/java/io/cucumber/junit/platform/engine/Constants.java).

```
cucumber.ansi-colors.disabled= # true or false.
# default: false
cucumber.filter.name= # a regular expression.
# only scenarios with matching names are executed.
# example: ^Hello (World|Cucumber)$
# note: To ensure consistent reports between Cucumber and
# JUnit 5 prefer using JUnit 5s discovery request filters
# or JUnit 5 tag expressions instead.
cucumber.features= # comma separated paths to feature files.
# example: path/to/example.feature, path/to/other.feature
# note: When used any discovery selectors from the JUnit
# Platform will be ignored. Use with caution and care.
cucumber.filter.tags= # a cucumber tag expression.
# only scenarios with matching tags are executed.
# example: @Cucumber and not (@Gherkin or @Zucchini)
# note: To ensure consistent reports between Cucumber and
# JUnit 5 prefer using JUnit 5s discovery request filters
# or JUnit 5 tag expressions instead.
cucumber.glue= # comma separated package names.
# example: com.example.glue
cucumber.junit-platform.naming-strategy= # long or short.
# default: short
# include parent descriptor name in test descriptor.
cucumber.plugin= # comma separated plugin strings.
# example: pretty, json:path/to/report.json
cucumber.object-factory= # object factory class name.
# example: com.example.MyObjectFactory
cucumber.publish.enabled # true or false.
# default: false
# enable publishing of test results
cucumber.publish.quiet # true or false.
# default: false
# suppress publish banner after test execution.
cucumber.publish.token # any string value.
# publish authenticated test results.
cucumber.snippet-type= # underscore or camelcase.
# default: underscore
cucumber.execution.dry-run= # true or false.
# default: false
cucumber.execution.execution-mode.feature= # same_thread or concurrent
# default: concurrent
# same_thread - executes scenarios sequentially in the
# same thread as the parent feature
# concurrent - executes scenarios concurrently on any
# available thread
cucumber.execution.parallel.enabled= # true or false.
# default: false
cucumber.execution.parallel.config.strategy= # dynamic, fixed or custom.
# default: dynamic
cucumber.execution.parallel.config.fixed.parallelism= # positive integer.
# example: 4
cucumber.execution.parallel.config.dynamic.factor= # positive double.
# default: 1.0
cucumber.execution.parallel.config.custom.class= # class name.
# example: com.example.MyCustomParallelStrategy
cucumber.execution.exclusive-resources.<tag-name>.read-write= # a comma separated list of strings
# example: resource-a, resource-b.
cucumber.execution.exclusive-resources.<tag-name>.read= # a comma separated list of strings
# example: resource-a, resource-b
cucumber.ansi-colors.disabled= # true or false.
# default: false
cucumber.filter.name= # a regular expression.
# only scenarios with matching names are executed.
# example: ^Hello (World|Cucumber)$
# note: To ensure consistent reports between Cucumber and
# JUnit 5 prefer using JUnit 5s discovery request filters
# or JUnit 5 tag expressions instead.
cucumber.features= # comma separated paths to feature files.
# example: path/to/example.feature, path/to/other.feature
# note: When used any discovery selectors from the JUnit
# Platform will be ignored. Use with caution and care.
cucumber.filter.tags= # a cucumber tag expression.
# only scenarios with matching tags are executed.
# example: @Cucumber and not (@Gherkin or @Zucchini)
# note: To ensure consistent reports between Cucumber and
# JUnit 5 prefer using JUnit 5s discovery request filters
# or JUnit 5 tag expressions instead.
cucumber.glue= # comma separated package names.
# example: com.example.glue
cucumber.junit-platform.naming-strategy= # long or short.
# default: short
# include parent descriptor name in test descriptor.
cucumber.plugin= # comma separated plugin strings.
# example: pretty, json:path/to/report.json
cucumber.object-factory= # object factory class name.
# example: com.example.MyObjectFactory
cucumber.publish.enabled # true or false.
# default: false
# enable publishing of test results
cucumber.publish.quiet # true or false.
# default: false
# suppress publish banner after test execution.
cucumber.publish.token # any string value.
# publish authenticated test results.
cucumber.snippet-type= # underscore or camelcase.
# default: underscore
cucumber.execution.dry-run= # true or false.
# default: false
cucumber.execution.execution-mode.feature= # same_thread or concurrent
# default: concurrent
# same_thread - executes scenarios sequentially in the
# same thread as the parent feature
# concurrent - executes scenarios concurrently on any
# available thread
cucumber.execution.parallel.enabled= # true or false.
# default: false
cucumber.execution.parallel.config.strategy= # dynamic, fixed or custom.
# default: dynamic
cucumber.execution.parallel.config.fixed.parallelism= # positive integer.
# example: 4
cucumber.execution.parallel.config.config.fixed.max-pool-size= # positive integer.
# example: 4
cucumber.execution.parallel.config.dynamic.factor= # positive double.
# default: 1.0
cucumber.execution.parallel.config.custom.class= # class name.
# example: com.example.MyCustomParallelStrategy
cucumber.execution.exclusive-resources.<tag-name>.read-write= # a comma separated list of strings
# example: resource-a, resource-b.
cucumber.execution.exclusive-resources.<tag-name>.read= # a comma separated list of strings
# example: resource-a, resource-b
```

## Supported Discovery Selectors and Filters ##
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