Github user juherr commented on the pull request:
https://github.com/apache/maven-surefire/pull/106#issuecomment-143677343
I had time to analyze and I found that `dataProviderThreadCount` is taken
into account only when `m_commandLineTestClasses != null ||
m_commandLineMethods != null`.
`m_commandLineTestClasses` could only be != null when `setTestClasses` is
called, and `m_commandLineMethods` could only be != null when `-methods` is
used, but `-methods` is not available via the deprecated `TestNG#configure(Map
cmdLineArgs)`.
I can't say if this behavior is expected or if something should be done in
TestNG. What do you think @cbeust?
Another solution would be to update `TestNGMapConfigurator#configure(
XmlSuite suite, Map<String, String> options )` (or another Configurator) from
surefire in order to use `suite.setDataProviderThreadCount()`. But the method
is only available since 5.10 where the current testng used by surefire is 5.7.
But I don't know if I' allowed to update the dependency.
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