diff --git a/tests/PhpSpreadsheetTests/Helper/DimensionTest.php b/tests/PhpSpreadsheetTests/Helper/DimensionTest.php
index 46ea88a16..e78c20163 100644
--- a/tests/PhpSpreadsheetTests/Helper/DimensionTest.php
+++ b/tests/PhpSpreadsheetTests/Helper/DimensionTest.php
@@ -6,24 +6,40 @@ namespace PhpOffice\PhpSpreadsheetTests\Helper;
 
 use PhpOffice\PhpSpreadsheet\Exception;
 use PhpOffice\PhpSpreadsheet\Helper\Dimension;
+use PhpOffice\PhpSpreadsheet\Helper\Size;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class DimensionTest extends TestCase
 {
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerCellWidth')]
+    #[DataProvider('providerCellWidth')]
     public function testCreateDimension(float $expectedResult, string $dimension): void
     {
         $result = (new Dimension($dimension))->width();
         self::assertSame($expectedResult, $result);
     }
 
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerConvertUoM')]
+    #[DataProvider('providerConvertUoM')]
     public function testConvertDimension(float $expectedResult, string $dimension, string $unitOfMeasure): void
     {
         $result = (new Dimension($dimension))->toUnit($unitOfMeasure);
         self::assertEqualsWithDelta($expectedResult, $result, 1.0e-12);
     }
 
+    public function testSizeAndUnit(): void
+    {
+        $size = new Size('10px');
+        self::assertTrue($size->valid());
+        self::assertSame('10', $size->size());
+        self::assertSame('px', $size->unit());
+        $size = new Size('9.3');
+        self::assertTrue($size->valid());
+        self::assertSame('9.3', $size->size());
+        self::assertSame('pt', $size->unit());
+        $size = new Size('8whatever');
+        self::assertFalse($size->valid());
+    }
+
     public function testConvertDimensionInvalidUoM(): void
     {
         $this->expectException(Exception::class);
diff --git a/tests/PhpSpreadsheetTests/Helper/SampleCoverageTest.php b/tests/PhpSpreadsheetTests/Helper/SampleCoverageTest.php
index deb8e2e6b..4931856c0 100644
--- a/tests/PhpSpreadsheetTests/Helper/SampleCoverageTest.php
+++ b/tests/PhpSpreadsheetTests/Helper/SampleCoverageTest.php
@@ -35,4 +35,19 @@ class SampleCoverageTest extends TestCase
             ->willReturn(false);
         $helper->getFilename('a.xlsx');
     }
+
+    public function testTitles(): void
+    {
+        $helper = new Sample();
+        ob_start();
+        $helper->titles('Category', 'FunctionName');
+        $output = (string) ob_get_clean();
+        $output = str_replace("\r", '', $output);
+        self::assertStringContainsString("Function: FunctionName()\n", $output);
+        ob_start();
+        $helper->titles('Category', 'FunctionName', 'Description');
+        $output = (string) ob_get_clean();
+        $output = str_replace("\r", '', $output);
+        self::assertStringContainsString("Function: FunctionName() - Description.\n", $output);
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/Style/FontTest.php b/tests/PhpSpreadsheetTests/Style/FontTest.php
index 389454527..b0d367cf9 100644
--- a/tests/PhpSpreadsheetTests/Style/FontTest.php
+++ b/tests/PhpSpreadsheetTests/Style/FontTest.php
@@ -108,4 +108,13 @@ class FontTest extends TestCase
         $font2bHash = $font2->getHashCode();
         self::assertNotEquals($font1->getHashCode(), $font2bHash);
     }
+
+    public function testAutoColorSupervisor(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->getStyle('A1')->getFont()->setAutoColor(true);
+        self::assertTrue($sheet->getStyle('A1')->getFont()->getAutoColor());
+        $spreadsheet->disconnectWorksheets();
+    }
 }