[8.17] tests: make integration split quantity configurable (backport #17219)

[mergify]

Release notes

[rn:skip]

What does this PR do?

Adds new optional positional parameter to ci/integration_tests.sh split, so that we can tell it how many partitions to split the tests into. When this parameter is missing, it is assumed to be 2 for backward-compatibility.

Why is it important/What is the impact to the user?

No user impact.

This allows us to configure a larger quantity of integration spec splits so that we can run more jobs in parallel.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

How to test this PR locally

Observe the splits in CI:

1.Split 0 Running integration specs split[0] of 2: specs/01_logstash_bin_smoke_spec.rb specs/cli/http_proxy_install_spec.rb specs/cli/keystore_spec.rb specs/cli/prepare_offline_pack_spec.rb specs/command_line_spec.rb specs/direct_heap_allocator_flag_spec.rb specs/env_variables_condition_spec.rb specs/es_output_how_spec.rb specs/install_java_plugin_spec.rb specs/kafka_input_spec.rb specs/mixed_codec_spec.rb specs/multiple_pipeline_spec.rb specs/plugin_name_log_spec.rb specs/reserved_tags_field_spec.rb specs/settings_spec.rb specs/webserver_spec.rb
2.Split 1 Running integration specs split[1] of 2: specs/beats_input_spec.rb specs/cli/install_spec.rb specs/cli/list_spec.rb specs/cli/remove_spec.rb specs/deprecation_log_spec.rb specs/dlq_spec.rb specs/env_variables_config_spec.rb specs/fatal_error_spec.rb specs/java_api_spec.rb specs/logstash_to_logstash_spec.rb specs/monitoring_api_spec.rb specs/pipeline_log_spec.rb specs/reload_config_spec.rb specs/secret_store_spec.rb specs/slowlog_spec.rb

OR:

1. echo the ./gradlew command instead of invoking it:

diff --git a/ci/integration_tests.sh b/ci/integration_tests.sh
index a6014ca89..fe28cbdc8 100755
--- a/ci/integration_tests.sh
+++ b/ci/integration_tests.sh
@@ -45,7 +45,7 @@ elif [[ $1 == "split" ]]; then
     done
 
     echo "Running integration specs split[${selected_partition}] of ${partition_count}: ${partition_specs[*]}"
-    ./gradlew runIntegrationTests -PrubyIntegrationSpecs="${partition_specs[*]}" --console=plain
+    echo ./gradlew runIntegrationTests -PrubyIntegrationSpecs="${partition_specs[*]}" --console=plain
 
 elif [[ !  -z  $@  ]]; then
     echo "Running integration tests 'rspec $@'"

2. Invoke splits to observe that all spec files are accounted for:

   ci/integration_tests.sh split 0 3
   ci/integration_tests.sh split 1 3
   ci/integration_tests.sh split 2 3
   

   ci/integration_tests.sh split 0 4
   ci/integration_tests.sh split 1 4
   ci/integration_tests.sh split 2 4
   ci/integration_tests.sh split 3 4
   ~~~<hr>This is an automatic backport of pull request #17219 done by [Mergify](https://mergify.com).
   

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[yaauie]

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