Slightly More Coverage

src/PhpSpreadsheet/Chart/Layout.php

@@ -508,11 +508,7 @@ class Layout
 
     public function getLabelFontColor(): ?ChartColor
     {
-        if ($this->labelFont === null) {
-            return null;
-        }
-
-        return $this->labelFont->getChartColor();
+        return $this->labelFont?->getChartColor();
     }
 
     public function setLabelFontColor(?ChartColor $chartColor): self

tests/PhpSpreadsheetTests/Chart/RenderTest.php

@@ -4,14 +4,45 @@ declare(strict_types=1);
 
 namespace PhpOffice\PhpSpreadsheetTests\Chart;
 
+use finfo;
 use PhpOffice\PhpSpreadsheet\Chart\Chart;
+use PhpOffice\PhpSpreadsheet\Chart\Renderer\MtJpGraphRenderer;
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx as XlsxReader;
+use PhpOffice\PhpSpreadsheet\Settings;
 use PHPUnit\Framework\TestCase;
 
 class RenderTest extends TestCase
 {
+    protected function tearDown(): void
+    {
+        Settings::unsetChartRenderer();
+    }
+
     public function testNoRenderer(): void
     {
         $chart = new Chart('Chart1');
         self::assertFalse($chart->render());
     }
+
+    public function testPhpOutput(): void
+    {
+        $infile = 'samples/templates/32readwriteAreaChart1.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($infile);
+        $sheet = $spreadsheet->getActiveSheet();
+        $charts = $sheet->getChartCollection();
+        self::assertCount(1, $charts);
+        $chart = $charts[0];
+        self::assertInstanceOf(Chart::class, $chart);
+        Settings::setChartRenderer(MtJpGraphRenderer::class);
+        ob_start();
+        $chart->render('php://output');
+        $data = ob_get_clean();
+        self::assertNotFalse($data);
+        $finfo = new finfo(FILEINFO_MIME_TYPE);
+        $type = $finfo->buffer($data);
+        self::assertSame('image/png', $type);
+        $spreadsheet->disconnectWorksheets();
+    }
 }