Refactor spreadsheetformatter so that the generate method becomes pure + add test

src/Bundle/ChillMainBundle/Export/Formatter/SpreadSheetFormatter.php

@@ -12,110 +12,25 @@ declare(strict_types=1);
 namespace Chill\MainBundle\Export\Formatter;
 
 use Chill\MainBundle\Export\ExportGenerationContext;
+use Chill\MainBundle\Export\ExportInterface;
 use Chill\MainBundle\Export\ExportManagerAwareInterface;
+use Chill\MainBundle\Export\FormattedExportGeneration;
 use Chill\MainBundle\Export\FormatterInterface;
 use Chill\MainBundle\Export\Helper\ExportManagerAwareTrait;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Contracts\Translation\TranslatableInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
-class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInterface
+final class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInterface
 {
     use ExportManagerAwareTrait;
 
-    /**
+    public function __construct(private readonly TranslatorInterface $translator) {}
-     * an array where keys are the aggregators aliases and
-     * values are the data.
-     *
-     * replaced when `getResponse` is called.
-     */
-    protected array $aggregatorsData;
-
-    /**
-     * The export.
-     *
-     * replaced when `getResponse` is called.
-     *
-     * @var \Chill\MainBundle\Export\ExportInterface
-     */
-    protected $export;
-
-
-    /**
-     * array containing value of export form.
-     *
-     * replaced when `getResponse` is called.
-     *
-     * @var array
-     */
-    protected $exportData;
-
-    /**
-     * replaced when `getResponse` is called.
-     *
-     * @var array
-     */
-    protected $filtersData;
-
-    /**
-     * replaced when `getResponse` is called.
-     *
-     * @var array
-     */
-    protected $formatterData;
-
-    /**
-     * The result, as returned by the export.
-     *
-     * replaced when `getResponse` is called.
-     *
-     * @var array
-     */
-    protected $result;
-
-    /**
-     * replaced when `getResponse` is called.
-     *
-     * @var array
-     */
-    // protected $labels;
-
-    /**
-     * temporary file to store spreadsheet.
-     *
-     * @var string
-     */
-    protected $tempfile;
-
-    /**
-     * @var TranslatorInterface
-     */
-    protected $translator;
-
-    /**
-     * cache for displayable result.
-     *
-     * This cache is reset when `getResponse` is called.
-     *
-     * The array's keys are the keys in the raw result, and
-     * values are the callable which will transform the raw result to
-     * displayable result.
-     */
-    private ?array $cacheDisplayableResult = null;
-
-    /**
-     * Whethe `cacheDisplayableResult` is initialized or not.
-     */
-    private bool $cacheDisplayableResultIsInitialized = false;
-
-    public function __construct(TranslatorInterface $translatorInterface)
-    {
-        $this->translator = $translatorInterface;
-    }
 
     public function buildForm(
         FormBuilderInterface $builder,
@@ -178,6 +93,51 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         return 'SpreadSheet (xlsx, ods)';
     }
 
+    public function generate(
+        $result,
+        $formatterData,
+        string $exportAlias,
+        array $exportData,
+        array $filtersData,
+        array $aggregatorsData,
+        ExportGenerationContext $context,
+    ) {
+        // Initialize local variables instead of class properties
+        /** @var ExportInterface $export */
+        $export = $this->getExportManager()->getExport($exportAlias);
+
+        // Initialize cache variables
+        $cacheDisplayableResult = $this->initializeDisplayable($result, $export, $exportData, $aggregatorsData);
+
+        $tempfile = \tempnam(\sys_get_temp_dir(), '');
+
+        if (false === $tempfile) {
+            throw new \RuntimeException('Unable to create temporary file');
+        }
+
+        $this->generateContent(
+            $context,
+            $tempfile,
+            $result,
+            $formatterData,
+            $export,
+            $exportData,
+            $filtersData,
+            $aggregatorsData,
+            $cacheDisplayableResult,
+        );
+
+        $result = new FormattedExportGeneration(
+            file_get_contents($tempfile),
+            $this->getContentType($formatterData['format']),
+        );
+
+        // remove the temp file from disk
+        \unlink($tempfile);
+
+        return $result;
+    }
+
     public function getResponse(
         $result,
         $formatterData,
@@ -187,33 +147,10 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         array $aggregatorsData,
         ExportGenerationContext $context,
     ): Response {
-        // store all data when the process is initiated
+        $formattedResult = $this->generate($result, $formatterData, $exportAlias, $exportData, $filtersData, $aggregatorsData, $context);
-        $this->result = $result;
-        $this->formatterData = $formatterData;
-        $this->export = $this->getExportManager()->getExport($exportAlias);
-        $this->exportData = $exportData;
-        $this->filtersData = $filtersData;
-        $this->aggregatorsData = $aggregatorsData;
 
-        // reset cache
+        $response = new BinaryFileResponse($formattedResult->content);
-        $this->cacheDisplayableResult = [];
+        $response->headers->set('Content-Type', $formattedResult->contentType);
-        $this->cacheDisplayableResultIsInitialized = false;
-
-        $response = new Response();
-        $response->headers->set(
-            'Content-Type',
-            $this->getContentType($this->formatterData['format'])
-        );
-
-        $this->tempfile = \tempnam(\sys_get_temp_dir(), '');
-        $this->generateContent($context);
-
-        $f = \fopen($this->tempfile, 'rb');
-        $response->setContent(\stream_get_contents($f));
-        fclose($f);
-
-        // remove the temp file from disk
-        \unlink($this->tempfile);
 
         return $response;
     }
@@ -223,7 +160,7 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         return 'tabular';
     }
 
-    protected function addContentTable(
+    private function addContentTable(
         Worksheet $worksheet,
         $sortedResults,
         $line,
@@ -245,11 +182,11 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      *
      * @return int the line number after the last description
      */
-    protected function addFiltersDescription(Worksheet &$worksheet, ExportGenerationContext $context)
+    private function addFiltersDescription(Worksheet &$worksheet, ExportGenerationContext $context, array $filtersData)
     {
         $line = 3;
 
-        foreach ($this->filtersData as $alias => $data) {
+        foreach ($filtersData as $alias => $data) {
             $filter = $this->getExportManager()->getFilter($alias);
             $description = $filter->describeAction($data, $context);
             if (\is_array($description)) {
@@ -274,26 +211,22 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      *
      * return the line number where the next content (i.e. result) should
      * be appended.
-     *
-     * @param int $line
-     *
-     * @return int
      */
-    protected function addHeaders(
+    private function addHeaders(
         Worksheet &$worksheet,
         array $globalKeys,
-        $line,
+        int $line,
-    ) {
+        array $cacheDisplayableResult = [],
+    ): int {
         // get the displayable form of headers
         $displayables = [];
-
         foreach ($globalKeys as $key) {
-            $displayable = $this->getDisplayableResult($key, '_header');
+            $displayable = $this->getDisplayableResult($key, '_header', $cacheDisplayableResult);
 
             if ($displayable instanceof TranslatableInterface) {
                 $displayables[] = $displayable->trans($this->translator, $this->translator->getLocale());
             } else {
-                $displayables[] = $this->translator->trans($this->getDisplayableResult($key, '_header'));
+                $displayables[] = $this->translator->trans($this->getDisplayableResult($key, '_header', $cacheDisplayableResult));
             }
         }
 
@@ -311,9 +244,9 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      * Add the title to the worksheet and merge the cell containing
      * the title.
      */
-    protected function addTitleToWorkSheet(Worksheet &$worksheet)
+    private function addTitleToWorkSheet(Worksheet &$worksheet, $export)
     {
-        $worksheet->setCellValue('A1', $this->getTitle());
+        $worksheet->setCellValue('A1', $this->getTitle($export));
         $worksheet->mergeCells('A1:G1');
     }
 
@@ -322,14 +255,14 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      *
      * @return array where 1st member is spreadsheet, 2nd is worksheet
      */
-    protected function createSpreadsheet()
+    private function createSpreadsheet($export)
     {
         $spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
         $worksheet = $spreadsheet->getActiveSheet();
 
         // setting the worksheet title and code name
         $worksheet
-            ->setTitle($this->getTitle())
+            ->setTitle($this->getTitle($export))
             ->setCodeName('result');
 
         return [$spreadsheet, $worksheet];
@@ -338,29 +271,38 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
     /**
      * Generate the content and write it to php://temp.
      */
-    protected function generateContent(ExportGenerationContext $context)
+    private function generateContent(
-    {
+        ExportGenerationContext $context,
-        [$spreadsheet, $worksheet] = $this->createSpreadsheet();
+        string $tempfile,
+        $result,
+        $formatterData,
+        $export,
+        array $exportData,
+        array $filtersData,
+        array $aggregatorsData,
+        array $cacheDisplayableResult,
+    ) {
+        [$spreadsheet, $worksheet] = $this->createSpreadsheet($export);
 
-        $this->addTitleToWorkSheet($worksheet);
+        $this->addTitleToWorkSheet($worksheet, $export);
-        $line = $this->addFiltersDescription($worksheet, $context);
+        $line = $this->addFiltersDescription($worksheet, $context, $filtersData);
 
-        // at this point, we are going to sort retsults for an easier manipulation
+        // at this point, we are going to sort results for an easier manipulation
         [$sortedResult, $exportKeys, $aggregatorKeys, $globalKeys] =
-            $this->sortResult();
+            $this->sortResult($result, $export, $exportData, $aggregatorsData, $formatterData, $cacheDisplayableResult);
 
-        $line = $this->addHeaders($worksheet, $globalKeys, $line);
+        $line = $this->addHeaders($worksheet, $globalKeys, $line, $cacheDisplayableResult);
 
-        $line = $this->addContentTable($worksheet, $sortedResult, $line);
+        $this->addContentTable($worksheet, $sortedResult, $line);
 
-        $writer = match ($this->formatterData['format']) {
+        $writer = match ($formatterData['format']) {
             'ods' => \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Ods'),
             'xlsx' => \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx'),
             'csv' => \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Csv'),
             default => throw new \LogicException(),
         };
 
-        $writer->save($this->tempfile);
+        $writer->save($tempfile);
     }
 
     /**
@@ -369,7 +311,7 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      *
      * @return string[] an array containing the keys of aggregators
      */
-    protected function getAggregatorKeysSorted()
+    private function getAggregatorKeysSorted(array $aggregatorsData, array $formatterData)
     {
         // empty array for aggregators keys
         $keys = [];
@@ -377,7 +319,7 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         // during sorting
         $aggregatorKeyAssociation = [];
 
-        foreach ($this->aggregatorsData as $alias => $data) {
+        foreach ($aggregatorsData as $alias => $data) {
             $aggregator = $this->exportManager->getAggregator($alias);
             $aggregatorsKeys = $aggregator->getQueryKeys($data);
             // append the keys from aggregator to the $keys existing array
@@ -389,9 +331,9 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         }
 
         // sort the result using the form
-        usort($keys, function ($a, $b) use ($aggregatorKeyAssociation) {
+        usort($keys, function ($a, $b) use ($aggregatorKeyAssociation, $formatterData) {
-            $A = $this->formatterData[$aggregatorKeyAssociation[$a]]['order'];
+            $A = $formatterData[$aggregatorKeyAssociation[$a]]['order'];
-            $B = $this->formatterData[$aggregatorKeyAssociation[$b]]['order'];
+            $B = $formatterData[$aggregatorKeyAssociation[$b]]['order'];
 
             if ($A === $B) {
                 return 0;
@@ -407,7 +349,7 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         return $keys;
     }
 
-    protected function getContentType($format)
+    private function getContentType($format)
     {
         switch ($format) {
             case 'csv':
@@ -424,23 +366,20 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
 
     /**
      * Get the displayable result.
-     *
-     * @param string $key
      */
-    protected function getDisplayableResult($key, mixed $value)
+    private function getDisplayableResult(
-    {
+        string $key,
-        if (false === $this->cacheDisplayableResultIsInitialized) {
+        mixed $value,
-            $this->initializeCache($key);
+        array $cacheDisplayableResult,
-        }
+    ): string|TranslatableInterface|\DateTimeInterface|int|float|bool {
-
         $value ??= '';
 
-        return \call_user_func($this->cacheDisplayableResult[$key], $value);
+        return \call_user_func($cacheDisplayableResult[$key], $value);
     }
 
-    protected function getTitle(): string
+    private function getTitle($export): string
     {
-        $original = $this->export->getTitle();
+        $original = $export->getTitle();
 
         if ($original instanceof TranslatableInterface) {
             $title = $original->trans($this->translator, $this->translator->getLocale());
@@ -455,8 +394,13 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         return $title;
     }
 
-    protected function initializeCache($key)
+    private function initializeDisplayable(
-    {
+        $result,
+        ExportInterface $export,
+        array $exportData,
+        array $aggregatorsData,
+    ): array {
+        $cacheDisplayableResult = [];
         /*
          * this function follows the following steps :
          *
@@ -469,12 +413,11 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         // 1. create an associative array with key and export / aggregator
         $keysExportElementAssociation = [];
         // keys for export
-        foreach ($this->export->getQueryKeys($this->exportData) as $key) {
+        foreach ($export->getQueryKeys($exportData) as $key) {
-            $keysExportElementAssociation[$key] = [$this->export,
+            $keysExportElementAssociation[$key] = [$export, $exportData];
-                $this->exportData, ];
         }
         // keys for aggregator
-        foreach ($this->aggregatorsData as $alias => $data) {
+        foreach ($aggregatorsData as $alias => $data) {
             $aggregator = $this->getExportManager()->getAggregator($alias);
 
             foreach ($aggregator->getQueryKeys($data) as $key) {
@@ -487,7 +430,7 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
 
         $allValues = [];
         // store all the values in an array
-        foreach ($this->result as $row) {
+        foreach ($result as $row) {
             foreach ($keys as $key) {
                 $allValues[$key][] = $row[$key];
             }
@@ -498,15 +441,14 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
         foreach ($keysExportElementAssociation as $key => [$element, $data]) {
             // handle the case when there is not results lines (query is empty)
             if ([] === $allValues) {
-                $this->cacheDisplayableResult[$key] = $element->getLabels($key, ['_header'], $data);
+                $cacheDisplayableResult[$key] = $element->getLabels($key, ['_header'], $data);
             } else {
-                $this->cacheDisplayableResult[$key] =
+                $cacheDisplayableResult[$key] =
                     $element->getLabels($key, \array_unique($allValues[$key]), $data);
             }
         }
 
-        // the cache is initialized !
+        return $cacheDisplayableResult;
-        $this->cacheDisplayableResultIsInitialized = true;
     }
 
     /**
@@ -544,23 +486,28 @@ class SpreadSheetFormatter implements FormatterInterface, ExportManagerAwareInte
      * )
      * ```
      */
-    protected function sortResult()
+    private function sortResult(
-    {
+        $result,
+        ExportInterface $export,
+        array $exportData,
+        array $aggregatorsData,
+        array $formatterData,
+        array $cacheDisplayableResult,
+    ) {
         // get the keys for each row
-        $exportKeys = $this->export->getQueryKeys($this->exportData);
+        $exportKeys = $export->getQueryKeys($exportData);
-        $aggregatorKeys = $this->getAggregatorKeysSorted();
+        $aggregatorKeys = $this->getAggregatorKeysSorted($aggregatorsData, $formatterData);
-
         $globalKeys = \array_merge($aggregatorKeys, $exportKeys);
 
-        $sortedResult = \array_map(function ($row) use ($globalKeys) {
+        $sortedResult = \array_map(function ($row) use ($globalKeys, $cacheDisplayableResult) {
             $newRow = [];
 
             foreach ($globalKeys as $key) {
-                $newRow[] = $this->getDisplayableResult($key, $row[$key]);
+                $newRow[] = $this->getDisplayableResult($key, $row[$key], $cacheDisplayableResult);
             }
 
             return $newRow;
-        }, $this->result);
+        }, $result);
 
         \array_multisort($sortedResult);
 

src/Bundle/ChillMainBundle/Tests/Export/Formatter/SpreadsheetFormatterTest.php

@@ -0,0 +1,138 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Tests\Export\Formatter;
+
+use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Export\ExportGenerationContext;
+use Chill\MainBundle\Export\ExportInterface;
+use Chill\MainBundle\Export\ExportManager;
+use Chill\MainBundle\Export\Formatter\SpreadSheetFormatter;
+use Chill\MainBundle\Service\RollingDate\RollingDate;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+use Symfony\Component\Translation\TranslatableMessage;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class SpreadsheetFormatterTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testGenerate(): void
+    {
+        $translator = $this->prophesize(\Symfony\Contracts\Translation\TranslatorInterface::class);
+        $translator->getLocale()->willReturn('en');
+        $exportManager = $this->prophesize(ExportManager::class);
+
+        $result =
+            [
+                ['export_count_activity' => 1, 'person_age' => 65, 'aggregator_some' => 'label0'], // row 0
+            ];
+        $exportAlias = 'count_activity_linked_to_person';
+        $formatterData =
+            ['format' => 'xlsx', 'person_age_aggregator' => ['order' => 1], 'aggregator2' => ['order' => 2]];
+        $exportData = [];
+        $filtersData =
+            [
+                'person_age_filter' => ['min_age' => 18, 'max_age' => 120, 'date_calc' => new RollingDate(RollingDate::T_TODAY)],
+                'filter2' => [],
+            ];
+        $aggregatorsData =
+            [
+                'person_age_aggregator' => ['date_age_calculation' => new RollingDate(RollingDate::T_TODAY)],
+                'aggregator2' => [],
+            ];
+        $context =
+            new ExportGenerationContext($user = new User());
+
+        $export = $this->prophesize(ExportInterface::class);
+        $export->getTitle()->willReturn('Count activity linked to person');
+        $translator->trans('Count activity linked to person')->willReturn('Count activity linked to person');
+        $export->getQueryKeys($exportData)->willReturn(['export_count_activity']);
+        $export->getLabels('export_count_activity', [1], $exportData)
+            ->willReturn(fn (int|string $value): int|string => '_header' === $value ? 'Count activities' : $value);
+        $translator->trans('Count activities')->willReturn('Count activities');
+        $exportManager->getExport($exportAlias)->willReturn($export->reveal());
+
+        $aggregator = $this->prophesize(\Chill\MainBundle\Export\AggregatorInterface::class);
+        $aggregator->getTitle()->willReturn('Person age');
+        $aggregator->getQueryKeys($aggregatorsData['person_age_aggregator'])->willReturn(['person_age']);
+        $aggregator->getLabels('person_age', [65], $aggregatorsData['person_age_aggregator'])
+            ->willReturn(fn (int|string $value): int|string => '_header' === $value ? 'Group by age' : $value);
+        $translator->trans('Group by age')->willReturn('Group by age');
+        $exportManager->getAggregator('person_age_aggregator')->willReturn($aggregator->reveal());
+
+        $aggregator2 = $this->prophesize(\Chill\MainBundle\Export\AggregatorInterface::class);
+        $aggregator2->getTitle()->willReturn(new TranslatableMessage('Some'));
+        $aggregator2->getQueryKeys($aggregatorsData['aggregator2'])->willReturn(['aggregator_some']);
+        $aggregator2->getLabels('aggregator_some', ['label0'], $aggregatorsData['aggregator2'])
+            ->willReturn(fn (int|string $value): TranslatableMessage => new TranslatableMessage('_header' === $value ? 'Aggregator 2 header' : $value));
+        $translator->trans('Aggregator 2 header', [], null, 'en')->willReturn('Aggregator 2 header');
+        $translator->trans('label0', [], null, 'en')->willReturn('label0');
+        $exportManager->getAggregator('aggregator2')->willReturn($aggregator2->reveal());
+
+        $filter = $this->prophesize(\Chill\MainBundle\Export\FilterInterface::class);
+        $filter->getTitle()->willReturn('Person by age');
+        $filter->describeAction($filtersData['person_age_filter'], $context)
+            ->willReturn(['Filter by age, from {{ start }} to {{ end }}', ['{{ start }}' => '18', '{{ end }}' => '120']]);
+        $translator->trans('Filter by age, from {{ start }} to {{ end }}', ['{{ start }}' => '18', '{{ end }}' => '120'])
+            ->willReturn('Filter by age, from 18 to 120');
+        $exportManager->getFilter('person_age_filter')->willReturn($filter->reveal());
+
+        $filter2 = $this->prophesize(\Chill\MainBundle\Export\FilterInterface::class);
+        $filter2->getTitle()->willReturn(new TranslatableMessage('Some other filter'));
+        $filter2->describeAction($filtersData['filter2'], $context)
+            ->willReturn(new TranslatableMessage('Other filter description'));
+        $translator->trans('Other filter description', [], null, 'en')
+            ->willReturn('Some other filter description');
+        $exportManager->getFilter('filter2')->willReturn($filter2->reveal());
+
+
+        // create the formatter
+        $formatter = new SpreadSheetFormatter($translator->reveal());
+        $formatter->setExportManager($exportManager->reveal());
+
+        $result = $formatter->generate(
+            $result,
+            $formatterData,
+            $exportAlias,
+            $exportData,
+            $filtersData,
+            $aggregatorsData,
+            $context,
+        );
+
+        $tempFile = tempnam(sys_get_temp_dir(), 'test_spreadsheet_formatter_');
+        file_put_contents($tempFile, $result->content);
+        $spreadsheet = IOFactory::load($tempFile);
+        $cells = $spreadsheet->getActiveSheet()->rangeToArray(
+            'A1:G6',
+            null,
+            false,
+            true,
+            true,
+        );
+        unlink($tempFile);
+
+        self::assertEquals('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', $result->contentType);
+        self::assertEquals($cells[1], ['A' => 'Count activity linked to perso…', 'B' => null, 'C' => null, 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+        self::assertEquals($cells[2], ['A' => null, 'B' => null, 'C' => null, 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+        self::assertEquals($cells[3], ['A' => 'Filter by age, from 18 to 120', 'B' => null, 'C' => null, 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+        self::assertEquals($cells[4], ['A' => 'Some other filter description', 'B' => null, 'C' => null, 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+        self::assertEquals($cells[5], ['A' => 'Group by age', 'B' => 'Aggregator 2 header', 'C' => 'Count activities', 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+        self::assertEquals($cells[6], ['A' => 65, 'B' => 'label0', 'C' => 1, 'D' => null, 'E' => null, 'F' => null, 'G' => null]);
+    }
+}