[Security Solution] fixes flaky-test-runner Cypress Security Solution tests

.buildkite/pipelines/flaky_tests/pipeline.js

@@ -174,6 +174,12 @@ for (const testSuite of testSuites) {
         concurrency: concurrency,
         concurrency_group: process.env.UUID,
         concurrency_method: 'eager',
+        env: {
+          // disable split of test cases between parallel jobs when running them in flaky test runner
+          // by setting chunks vars to value 1, which means all test will run in one job
+          CLI_NUMBER: 1,
+          CLI_COUNT: 1,
+        },
       });
       break;
     default:

.buildkite/scripts/steps/functional/security_solution.sh

@@ -5,8 +5,8 @@ set -euo pipefail
 source .buildkite/scripts/steps/functional/common.sh
 
 export JOB=kibana-security-solution-chrome
-export CLI_NUMBER=$((BUILDKITE_PARALLEL_JOB+1))
-export CLI_COUNT=$BUILDKITE_PARALLEL_JOB_COUNT
+export CLI_NUMBER=${CLI_NUMBER:-$((BUILDKITE_PARALLEL_JOB+1))}
+export CLI_COUNT=${CLI_COUNT:-$BUILDKITE_PARALLEL_JOB_COUNT}
 
 echo "--- Security Solution tests (Chrome)"
 

x-pack/test/security_solution_cypress/runner.ts

@@ -57,6 +57,15 @@ export async function SecuritySolutionConfigurableCypressTestRunner(
   });
 }
 
+/**
+ * Takes total CI jobs number(totalCiJobs) between which tests will be split and sequential number of the job(ciJobNumber).
+ * This helper will split file list cypress integrations into chunks, and run integrations in chunk which match ciJobNumber
+ * If both totalCiJobs === 1 && ciJobNumber === 1, this function will run all existing tests, without splitting them
+ * @param context FtrProviderContext
+ * @param {number} totalCiJobs - total number of jobs between which tests will be split
+ * @param {number} ciJobNumber - number of job
+ * @returns
+ */
 export async function SecuritySolutionCypressCliTestRunnerCI(
   context: FtrProviderContext,
   totalCiJobs: number,