Save results cache files to log folder for later analysis

Bug: T378797
Change-Id: I3f0177e85d71dd5c1526cdd42fbee69d8d1f6eca

Author: codders

Diff for: .gitignore

@@ -56,6 +56,7 @@ node_modules/
 /resources/lib/.foreign
 /tests/phpunit/phpunit.phar
 .phpunit.result.cache
+phpunit*result.cache
 /tests/phpunit/.phpunit.result.cache
 phpunit.xml
 /tests/selenium/log

Diff for: includes/composer/ComposerLaunchParallel.php

@@ -108,16 +108,20 @@ protected function prepareEnvironment() {
 	}
 
 	private function runTestSuite( int $groupId ) {
+		$logDir = getenv( 'MW_LOG_DIR' ) ?? '.';
 		$excludeGroups = array_diff( $this->excludeGroups, $this->groups );
 		$groupName = "database";
 		if ( !self::isDatabaseRunForGroups( $this->groups, $excludeGroups ) ) {
 			$groupName = "databaseless";
 		}
+		$resultCacheFile = implode( DIRECTORY_SEPARATOR, [
+			$logDir, "phpunit_group_{$groupId}_{$groupName}.result.cache"
+		] );
 		$result = $this->splitGroupExecutor->executeSplitGroup(
 			"split_group_$groupId",
 			$this->groups,
 			$excludeGroups,
-			".phpunit_group_{$groupId}_{$groupName}.result.cache",
+			$resultCacheFile,
 			$groupId
 		);
 		$consoleOutput = $result->getStdout();

Diff for: tests/phpunit/unit/includes/composer/ComposerLaunchParallelTest.php

@@ -44,6 +44,7 @@ private function getMockSystemInterface( string $logFileName ): ComposerSystemIn
 	}
 
 	public function testExecuteDatabaseSuite() {
+		$logDir = getenv( 'MW_LOG_DIR' ) ?? '.';
 		$executor = $this->createMock( SplitGroupExecutor::class );
 		$systemInterface = $this->getMockSystemInterface( 'phpunit_output_1_database.log' );
 		$composerLaunchParallel = new ComposerLaunchParallel(
@@ -59,7 +60,7 @@ public function testExecuteDatabaseSuite() {
 			->with( 'split_group_1',
 				[ 'Database' ],
 				[ 'Broken' ],
-				".phpunit_group_1_database.result.cache",
+				$logDir . "/phpunit_group_1_database.result.cache",
 				1
 			)
 			->willReturn( $result );
@@ -68,6 +69,7 @@ public function testExecuteDatabaseSuite() {
 	}
 
 	public function testExecuteDatabaselessSuite() {
+		$logDir = getenv( 'MW_LOG_DIR' ) ?? '.';
 		$executor = $this->createMock( SplitGroupExecutor::class );
 		$systemInterface = $this->getMockSystemInterface( 'phpunit_output_1_databaseless.log' );
 		$composerLaunchParallel = new ComposerLaunchParallel(
@@ -83,7 +85,7 @@ public function testExecuteDatabaselessSuite() {
 			->with( 'split_group_1',
 				[],
 				[ 'Broken', 'Standalone', 'Database' ],
-				".phpunit_group_1_databaseless.result.cache",
+				$logDir . "/phpunit_group_1_databaseless.result.cache",
 				1
 			)
 			->willReturn( $result );