class SelectSubqueryTest in Drupal 8

Same name and namespace in other branches

9 core/tests/Drupal/KernelTests/Core/Database/SelectSubqueryTest.php \Drupal\KernelTests\Core\Database\SelectSubqueryTest

Tests the Select query builder.

@group Database

Hierarchy

class \Drupal\KernelTests\KernelTestBase extends \PHPUnit\Framework\TestCase implements ServiceProviderInterface uses AssertContentTrait, AssertLegacyTrait, AssertHelperTrait, ConfigTestTrait, PhpunitCompatibilityTrait, RandomGeneratorTrait, TestRequirementsTrait
- class \Drupal\KernelTests\Core\Database\DatabaseTestBase
  - class \Drupal\KernelTests\Core\Database\SelectSubqueryTest

Expanded class hierarchy of SelectSubqueryTest

File

core/tests/Drupal/KernelTests/Core/Database/SelectSubqueryTest.php, line 10

Namespace

Drupal\KernelTests\Core\Database

View source

class SelectSubqueryTest extends DatabaseTestBase {

  /**
   * Tests that we can use a subquery in a FROM clause.
   */
  public function testFromSubquerySelect() {

    // Create a subquery, which is just a normal query object.
    $subquery = $this->connection
      ->select('test_task', 'tt');
    $subquery
      ->addField('tt', 'pid', 'pid');
    $subquery
      ->addField('tt', 'task', 'task');
    $subquery
      ->condition('priority', 1);
    for ($i = 0; $i < 2; $i++) {

      // Create another query that joins against the virtual table resulting
      // from the subquery.
      $select = $this->connection
        ->select($subquery, 'tt2');
      $select
        ->join('test', 't', 't.id=tt2.pid');
      $select
        ->addField('t', 'name');
      if ($i) {

        // Use a different number of conditions here to confuse the subquery
        // placeholder counter, testing https://www.drupal.org/node/1112854.
        $select
          ->condition('name', 'John');
      }
      $select
        ->condition('task', 'code');

      // The resulting query should be equivalent to:
      // SELECT t.name
      // FROM (SELECT tt.pid AS pid, tt.task AS task FROM test_task tt WHERE priority=1) tt
      //   INNER JOIN test t ON t.id=tt.pid
      // WHERE tt.task = 'code'
      $people = $select
        ->execute()
        ->fetchCol();
      $this
        ->assertCount(1, $people, 'Returned the correct number of rows.');
    }
  }

  /**
   * Tests that we can use a subquery in a FROM clause with a LIMIT.
   */
  public function testFromSubquerySelectWithLimit() {

    // Create a subquery, which is just a normal query object.
    $subquery = $this->connection
      ->select('test_task', 'tt');
    $subquery
      ->addField('tt', 'pid', 'pid');
    $subquery
      ->addField('tt', 'task', 'task');
    $subquery
      ->orderBy('priority', 'DESC');
    $subquery
      ->range(0, 1);

    // Create another query that joins against the virtual table resulting
    // from the subquery.
    $select = $this->connection
      ->select($subquery, 'tt2');
    $select
      ->join('test', 't', 't.id=tt2.pid');
    $select
      ->addField('t', 'name');

    // The resulting query should be equivalent to:
    // SELECT t.name
    // FROM (SELECT tt.pid AS pid, tt.task AS task FROM test_task tt ORDER BY priority DESC LIMIT 1 OFFSET 0) tt
    //   INNER JOIN test t ON t.id=tt.pid
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertCount(1, $people, 'Returned the correct number of rows.');
  }

  /**
   * Tests that we can use a subquery with an IN operator in a WHERE clause.
   */
  public function testConditionSubquerySelect() {

    // Create a subquery, which is just a normal query object.
    $subquery = $this->connection
      ->select('test_task', 'tt');
    $subquery
      ->addField('tt', 'pid', 'pid');
    $subquery
      ->condition('tt.priority', 1);

    // Create another query that joins against the virtual table resulting
    // from the subquery.
    $select = $this->connection
      ->select('test_task', 'tt2');
    $select
      ->addField('tt2', 'task');
    $select
      ->condition('tt2.pid', $subquery, 'IN');

    // The resulting query should be equivalent to:
    // SELECT tt2.name
    // FROM test tt2
    // WHERE tt2.pid IN (SELECT tt.pid AS pid FROM test_task tt WHERE tt.priority=1)
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertCount(5, $people, 'Returned the correct number of rows.');
  }

  /**
   * Test that we can use a subquery with a relational operator in a WHERE clause.
   */
  public function testConditionSubquerySelect2() {

    // Create a subquery, which is just a normal query object.
    $subquery = $this->connection
      ->select('test', 't2');
    $subquery
      ->addExpression('AVG(t2.age)');

    // Create another query that adds a clause using the subquery.
    $select = $this->connection
      ->select('test', 't');
    $select
      ->addField('t', 'name');
    $select
      ->condition('t.age', $subquery, '<');

    // The resulting query should be equivalent to:
    // SELECT t.name
    // FROM test t
    // WHERE t.age < (SELECT AVG(t2.age) FROM test t2)
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertEqualsCanonicalizing([
      'John',
      'Paul',
    ], $people, 'Returned Paul and John.');
  }

  /**
   * Test that we can use 2 subqueries with a relational operator in a WHERE clause.
   */
  public function testConditionSubquerySelect3() {

    // Create subquery 1, which is just a normal query object.
    $subquery1 = $this->connection
      ->select('test_task', 'tt');
    $subquery1
      ->addExpression('AVG(tt.priority)');
    $subquery1
      ->where('tt.pid = t.id');

    // Create subquery 2, which is just a normal query object.
    $subquery2 = $this->connection
      ->select('test_task', 'tt2');
    $subquery2
      ->addExpression('AVG(tt2.priority)');

    // Create another query that adds a clause using the subqueries.
    $select = $this->connection
      ->select('test', 't');
    $select
      ->addField('t', 'name');
    $select
      ->condition($subquery1, $subquery2, '>');

    // The resulting query should be equivalent to:
    // SELECT t.name
    // FROM test t
    // WHERE (SELECT AVG(tt.priority) FROM test_task tt WHERE tt.pid = t.id) > (SELECT AVG(tt2.priority) FROM test_task tt2)
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertEqualsCanonicalizing([
      'John',
    ], $people, 'Returned John.');
  }

  /**
   * Test that we can use multiple subqueries.
   *
   * This test uses a subquery at the left hand side and multiple subqueries at
   * the right hand side. The test query may not be that logical but that's due
   * to the limited amount of data and tables. 'Valid' use cases do exist :)
   */
  public function testConditionSubquerySelect4() {

    // Create subquery 1, which is just a normal query object.
    $subquery1 = $this->connection
      ->select('test_task', 'tt');
    $subquery1
      ->addExpression('AVG(tt.priority)');
    $subquery1
      ->where('tt.pid = t.id');

    // Create subquery 2, which is just a normal query object.
    $subquery2 = $this->connection
      ->select('test_task', 'tt2');
    $subquery2
      ->addExpression('MIN(tt2.priority)');
    $subquery2
      ->where('tt2.pid <> t.id');

    // Create subquery 3, which is just a normal query object.
    $subquery3 = $this->connection
      ->select('test_task', 'tt3');
    $subquery3
      ->addExpression('AVG(tt3.priority)');
    $subquery3
      ->where('tt3.pid <> t.id');

    // Create another query that adds a clause using the subqueries.
    $select = $this->connection
      ->select('test', 't');
    $select
      ->addField('t', 'name');
    $select
      ->condition($subquery1, [
      $subquery2,
      $subquery3,
    ], 'BETWEEN');

    // The resulting query should be equivalent to:
    // SELECT t.name AS name
    // FROM {test} t
    // WHERE (SELECT AVG(tt.priority) AS expression FROM {test_task} tt WHERE (tt.pid = t.id))
    //   BETWEEN (SELECT MIN(tt2.priority) AS expression FROM {test_task} tt2 WHERE (tt2.pid <> t.id))
    //       AND (SELECT AVG(tt3.priority) AS expression FROM {test_task} tt3 WHERE (tt3.pid <> t.id));
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertEqualsCanonicalizing([
      'George',
      'Paul',
    ], $people, 'Returned George and Paul.');
  }

  /**
   * Tests that we can use a subquery in a JOIN clause.
   */
  public function testJoinSubquerySelect() {

    // Create a subquery, which is just a normal query object.
    $subquery = $this->connection
      ->select('test_task', 'tt');
    $subquery
      ->addField('tt', 'pid', 'pid');
    $subquery
      ->condition('priority', 1);

    // Create another query that joins against the virtual table resulting
    // from the subquery.
    $select = $this->connection
      ->select('test', 't');
    $select
      ->join($subquery, 'tt', 't.id=tt.pid');
    $select
      ->addField('t', 'name');

    // The resulting query should be equivalent to:
    // SELECT t.name
    // FROM test t
    //   INNER JOIN (SELECT tt.pid AS pid FROM test_task tt WHERE priority=1) tt ON t.id=tt.pid
    $people = $select
      ->execute()
      ->fetchCol();
    $this
      ->assertCount(2, $people, 'Returned the correct number of rows.');
  }

  /**
   * Tests EXISTS subquery conditionals on SELECT statements.
   *
   * We essentially select all rows from the {test} table that have matching
   * rows in the {test_people} table based on the shared name column.
   */
  public function testExistsSubquerySelect() {

    // Put George into {test_people}.
    $this->connection
      ->insert('test_people')
      ->fields([
      'name' => 'George',
      'age' => 27,
      'job' => 'Singer',
    ])
      ->execute();

    // Base query to {test}.
    $query = $this->connection
      ->select('test', 't')
      ->fields('t', [
      'name',
    ]);

    // Subquery to {test_people}.
    $subquery = $this->connection
      ->select('test_people', 'tp')
      ->fields('tp', [
      'name',
    ])
      ->where('tp.name = t.name');
    $query
      ->exists($subquery);
    $result = $query
      ->execute();

    // Ensure that we got the right record.
    $record = $result
      ->fetch();
    $this
      ->assertEquals('George', $record->name, 'Fetched name is correct using EXISTS query.');
  }

  /**
   * Tests NOT EXISTS subquery conditionals on SELECT statements.
   *
   * We essentially select all rows from the {test} table that don't have
   * matching rows in the {test_people} table based on the shared name column.
   */
  public function testNotExistsSubquerySelect() {

    // Put George into {test_people}.
    $this->connection
      ->insert('test_people')
      ->fields([
      'name' => 'George',
      'age' => 27,
      'job' => 'Singer',
    ])
      ->execute();

    // Base query to {test}.
    $query = $this->connection
      ->select('test', 't')
      ->fields('t', [
      'name',
    ]);

    // Subquery to {test_people}.
    $subquery = $this->connection
      ->select('test_people', 'tp')
      ->fields('tp', [
      'name',
    ])
      ->where('tp.name = t.name');
    $query
      ->notExists($subquery);

    // Ensure that we got the right number of records.
    $people = $query
      ->execute()
      ->fetchCol();
    $this
      ->assertCount(3, $people, 'NOT EXISTS query returned the correct results.');
  }

}

Members

Name	Modifiers	Type	Description	Overrides
AssertContentTrait::$content	protected	property	The current raw content.
AssertContentTrait::$drupalSettings	protected	property	The drupalSettings value from the current raw $content.
AssertContentTrait::$elements	protected	property	The XML structure parsed from the current raw $content.	1
AssertContentTrait::$plainTextContent	protected	property	The plain-text content of raw $content (text nodes).
AssertContentTrait::assertEscaped	protected	function	Passes if the raw text IS found escaped on the loaded page, fail otherwise.
AssertContentTrait::assertField	protected	function	Asserts that a field exists with the given name or ID.
AssertContentTrait::assertFieldById	protected	function	Asserts that a field exists with the given ID and value.
AssertContentTrait::assertFieldByName	protected	function	Asserts that a field exists with the given name and value.
AssertContentTrait::assertFieldByXPath	protected	function	Asserts that a field exists in the current page by the given XPath.
AssertContentTrait::assertFieldChecked	protected	function	Asserts that a checkbox field in the current page is checked.
AssertContentTrait::assertFieldsByValue	protected	function	Asserts that a field exists in the current page with a given Xpath result.
AssertContentTrait::assertLink	protected	function	Passes if a link with the specified label is found.
AssertContentTrait::assertLinkByHref	protected	function	Passes if a link containing a given href (part) is found.
AssertContentTrait::assertNoDuplicateIds	protected	function	Asserts that each HTML ID is used for just a single element.
AssertContentTrait::assertNoEscaped	protected	function	Passes if the raw text IS NOT found escaped on the loaded page, fail otherwise.
AssertContentTrait::assertNoField	protected	function	Asserts that a field does not exist with the given name or ID.
AssertContentTrait::assertNoFieldById	protected	function	Asserts that a field does not exist with the given ID and value.
AssertContentTrait::assertNoFieldByName	protected	function	Asserts that a field does not exist with the given name and value.
AssertContentTrait::assertNoFieldByXPath	protected	function	Asserts that a field does not exist or its value does not match, by XPath.
AssertContentTrait::assertNoFieldChecked	protected	function	Asserts that a checkbox field in the current page is not checked.
AssertContentTrait::assertNoLink	protected	function	Passes if a link with the specified label is not found.
AssertContentTrait::assertNoLinkByHref	protected	function	Passes if a link containing a given href (part) is not found.
AssertContentTrait::assertNoLinkByHrefInMainRegion	protected	function	Passes if a link containing a given href is not found in the main region.
AssertContentTrait::assertNoOption	protected	function	Asserts that a select option in the current page does not exist.
AssertContentTrait::assertNoOptionSelected	protected	function	Asserts that a select option in the current page is not checked.
AssertContentTrait::assertNoPattern	protected	function	Triggers a pass if the perl regex pattern is not found in raw content.
AssertContentTrait::assertNoRaw	protected	function	Passes if the raw text is NOT found on the loaded page, fail otherwise.
AssertContentTrait::assertNoText	protected	function	Passes if the page (with HTML stripped) does not contains the text.
AssertContentTrait::assertNoTitle	protected	function	Pass if the page title is not the given string.
AssertContentTrait::assertNoUniqueText	protected	function	Passes if the text is found MORE THAN ONCE on the text version of the page.
AssertContentTrait::assertOption	protected	function	Asserts that a select option in the current page exists.
AssertContentTrait::assertOptionByText	protected	function	Asserts that a select option with the visible text exists.
AssertContentTrait::assertOptionSelected	protected	function	Asserts that a select option in the current page is checked.
AssertContentTrait::assertOptionSelectedWithDrupalSelector	protected	function	Asserts that a select option in the current page is checked.
AssertContentTrait::assertOptionWithDrupalSelector	protected	function	Asserts that a select option in the current page exists.
AssertContentTrait::assertPattern	protected	function	Triggers a pass if the Perl regex pattern is found in the raw content.
AssertContentTrait::assertRaw	protected	function	Passes if the raw text IS found on the loaded page, fail otherwise.
AssertContentTrait::assertText	protected	function	Passes if the page (with HTML stripped) contains the text.
AssertContentTrait::assertTextHelper	protected	function	Helper for assertText and assertNoText.
AssertContentTrait::assertTextPattern	protected	function	Asserts that a Perl regex pattern is found in the plain-text content.
AssertContentTrait::assertThemeOutput	protected	function	Asserts themed output.
AssertContentTrait::assertTitle	protected	function	Pass if the page title is the given string.
AssertContentTrait::assertUniqueText	protected	function	Passes if the text is found ONLY ONCE on the text version of the page.
AssertContentTrait::assertUniqueTextHelper	protected	function	Helper for assertUniqueText and assertNoUniqueText.
AssertContentTrait::buildXPathQuery	protected	function	Builds an XPath query.
AssertContentTrait::constructFieldXpath	protected	function	Helper: Constructs an XPath for the given set of attributes and value.
AssertContentTrait::cssSelect	protected	function	Searches elements using a CSS selector in the raw content.
AssertContentTrait::getAllOptions	protected	function	Get all option elements, including nested options, in a select.
AssertContentTrait::getDrupalSettings	protected	function	Gets the value of drupalSettings for the currently-loaded page.
AssertContentTrait::getRawContent	protected	function	Gets the current raw content.
AssertContentTrait::getSelectedItem	protected	function	Get the selected value from a select field.
AssertContentTrait::getTextContent	protected	function	Retrieves the plain-text content from the current raw content.
AssertContentTrait::getUrl	protected	function	Get the current URL from the cURL handler.	1
AssertContentTrait::parse	protected	function	Parse content returned from curlExec using DOM and SimpleXML.
AssertContentTrait::removeWhiteSpace	protected	function	Removes all white-space between HTML tags from the raw content.
AssertContentTrait::setDrupalSettings	protected	function	Sets the value of drupalSettings for the currently-loaded page.
AssertContentTrait::setRawContent	protected	function	Sets the raw content (e.g. HTML).
AssertContentTrait::xpath	protected	function	Performs an xpath search on the contents of the internal browser.
AssertHelperTrait::castSafeStrings	protected static	function	Casts MarkupInterface objects into strings.
AssertLegacyTrait::assert	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertTrue() instead.
AssertLegacyTrait::assertEqual	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertEquals() instead.
AssertLegacyTrait::assertIdentical	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertSame() instead.
AssertLegacyTrait::assertIdenticalObject	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertEquals() instead.
AssertLegacyTrait::assertNotEqual	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertNotEquals() instead.
AssertLegacyTrait::assertNotIdentical	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertNotSame() instead.
AssertLegacyTrait::pass	protected	function	Deprecated Scheduled for removal in Drupal 10.0.0. Use self::assertTrue() instead.
AssertLegacyTrait::verbose	protected	function
ConfigTestTrait::configImporter	protected	function	Returns a ConfigImporter object to import test configuration.
ConfigTestTrait::copyConfig	protected	function	Copies configuration objects from source storage to target storage.
DatabaseTestBase::$connection	protected	property	The database connection for testing.
DatabaseTestBase::$modules	public static	property	Modules to enable. Overrides KernelTestBase::$modules	5
DatabaseTestBase::addSampleData	public static	function	Sets up our sample data.
DatabaseTestBase::ensureSampleDataNull	public	function	Sets up tables for NULL handling.
DatabaseTestBase::setUp	protected	function	Overrides KernelTestBase::setUp	1
KernelTestBase::$backupGlobals	protected	property	Back up and restore any global variables that may be changed by tests.
KernelTestBase::$backupStaticAttributes	protected	property	Back up and restore static class properties that may be changed by tests.
KernelTestBase::$backupStaticAttributesBlacklist	protected	property	Contains a few static class properties for performance.
KernelTestBase::$classLoader	protected	property
KernelTestBase::$configImporter	protected	property	@todo Move into Config test base class.	7
KernelTestBase::$configSchemaCheckerExclusions	protected static	property	An array of config object names that are excluded from schema checking.
KernelTestBase::$container	protected	property
KernelTestBase::$databasePrefix	protected	property
KernelTestBase::$preserveGlobalState	protected	property	Do not forward any global state from the parent process to the processes that run the actual tests.
KernelTestBase::$root	protected	property	The app root.
KernelTestBase::$runTestInSeparateProcess	protected	property	Kernel tests are run in separate processes because they allow autoloading of code from extensions. Running the test in a separate process isolates this behavior from other tests. Subclasses should not override this property.
KernelTestBase::$siteDirectory	protected	property
KernelTestBase::$strictConfigSchema	protected	property	Set to TRUE to strict check all configuration saved.	6
KernelTestBase::$vfsRoot	protected	property	The virtual filesystem root directory.
KernelTestBase::assertPostConditions	protected	function		1
KernelTestBase::bootEnvironment	protected	function	Bootstraps a basic test environment.
KernelTestBase::bootKernel	private	function	Bootstraps a kernel for a test.
KernelTestBase::config	protected	function	Configuration accessor for tests. Returns non-overridden configuration.
KernelTestBase::disableModules	protected	function	Disables modules for this test.
KernelTestBase::enableModules	protected	function	Enables modules for this test.
KernelTestBase::getConfigSchemaExclusions	protected	function	Gets the config schema exclusions for this test.
KernelTestBase::getDatabaseConnectionInfo	protected	function	Returns the Database connection info to be used for this test.	1
KernelTestBase::getDatabasePrefix	public	function
KernelTestBase::getExtensionsForModules	private	function	Returns Extension objects for $modules to enable.
KernelTestBase::getModulesToEnable	private static	function	Returns the modules to enable for this test.
KernelTestBase::initFileCache	protected	function	Initializes the FileCache component.
KernelTestBase::installConfig	protected	function	Installs default configuration for a given list of modules.
KernelTestBase::installEntitySchema	protected	function	Installs the storage schema for a specific entity type.
KernelTestBase::installSchema	protected	function	Installs database tables from a module schema definition.
KernelTestBase::isTestInIsolation Deprecated	protected	function	Returns whether the current test method is running in a separate process.
KernelTestBase::prepareTemplate	protected	function
KernelTestBase::register	public	function	Registers test-specific services. Overrides ServiceProviderInterface::register	26
KernelTestBase::render	protected	function	Renders a render array.	1
KernelTestBase::setInstallProfile	protected	function	Sets the install profile and rebuilds the container to update it.
KernelTestBase::setSetting	protected	function	Sets an in-memory Settings variable.
KernelTestBase::setUpBeforeClass	public static	function		1
KernelTestBase::setUpFilesystem	protected	function	Sets up the filesystem, so things like the file directory.	2
KernelTestBase::stop	protected	function	Stops test execution.
KernelTestBase::tearDown	protected	function		6
KernelTestBase::tearDownCloseDatabaseConnection	public	function	@after
KernelTestBase::vfsDump	protected	function	Dumps the current state of the virtual filesystem to STDOUT.
KernelTestBase::__get Deprecated	public	function	BC: Automatically resolve former KernelTestBase class properties.
KernelTestBase::__sleep	public	function	Prevents serializing any properties.
PhpunitCompatibilityTrait::getMock Deprecated	public	function	Returns a mock object for the specified class using the available method.
PhpunitCompatibilityTrait::setExpectedException Deprecated	public	function	Compatibility layer for PHPUnit 6 to support PHPUnit 4 code.
RandomGeneratorTrait::$randomGenerator	protected	property	The random generator.
RandomGeneratorTrait::getRandomGenerator	protected	function	Gets the random generator for the utility methods.
RandomGeneratorTrait::randomMachineName	protected	function	Generates a unique random string containing letters and numbers.	1
RandomGeneratorTrait::randomObject	public	function	Generates a random PHP object.
RandomGeneratorTrait::randomString	public	function	Generates a pseudo-random string of ASCII characters of codes 32 to 126.
RandomGeneratorTrait::randomStringValidate	public	function	Callback for random string validation.
SelectSubqueryTest::testConditionSubquerySelect	public	function	Tests that we can use a subquery with an IN operator in a WHERE clause.
SelectSubqueryTest::testConditionSubquerySelect2	public	function	Test that we can use a subquery with a relational operator in a WHERE clause.
SelectSubqueryTest::testConditionSubquerySelect3	public	function	Test that we can use 2 subqueries with a relational operator in a WHERE clause.
SelectSubqueryTest::testConditionSubquerySelect4	public	function	Test that we can use multiple subqueries.
SelectSubqueryTest::testExistsSubquerySelect	public	function	Tests EXISTS subquery conditionals on SELECT statements.
SelectSubqueryTest::testFromSubquerySelect	public	function	Tests that we can use a subquery in a FROM clause.
SelectSubqueryTest::testFromSubquerySelectWithLimit	public	function	Tests that we can use a subquery in a FROM clause with a LIMIT.
SelectSubqueryTest::testJoinSubquerySelect	public	function	Tests that we can use a subquery in a JOIN clause.
SelectSubqueryTest::testNotExistsSubquerySelect	public	function	Tests NOT EXISTS subquery conditionals on SELECT statements.
StorageCopyTrait::replaceStorageContents	protected static	function	Copy the configuration from one storage to another and remove stale items.
TestRequirementsTrait::checkModuleRequirements	private	function	Checks missing module requirements.
TestRequirementsTrait::checkRequirements	protected	function	Check module requirements for the Drupal use case.	1
TestRequirementsTrait::getDrupalRoot	protected static	function	Returns the Drupal root directory.

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class SelectSubqueryTest in Drupal 8

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