fix minor test issues

Author: nicolaasuni

README.md

@@ -166,7 +166,7 @@ Or add to your `composer.json`:
 ```json
 {
     "require": {
-        "tecnickcom/tc-lib-pdf": "^8.6"
+        "tecnickcom/tc-lib-pdf": "^8"
     }
 }
 ```

src/SVG.php

@@ -1187,6 +1187,10 @@ protected function getSVGPath(
             $coord['firstcmd'] = false;
         }
 
+        if (empty($out)) {
+            return '';
+        }
+
         $this->bbox[] = [
             'x' => $coord['xmin'],
             'y' => $coord['ymin'],

test/OutputTest.php

@@ -687,12 +687,15 @@ public function testPatternStreamResourcesParseGradientAndImageDoTokens(): void
         $outfont = new \Com\Tecnick\Pdf\Font\Output($font->getFonts(), $pon, $encrypt);
         $this->setObjectProperty($obj, 'outfont', $outfont);
 
-        // Register a gradient shader to ensure gradient resources are available.
-        $graph->getAlpha(0.8);
-        $graph->getStopTransform();
+        $graph->getLinearGradient(0.0, 0.0, 10.0, 10.0, 'red', 'blue');
+        $graph->getOutGradientShaders($pon);
+        $gradientId = $graph->getLastGradientID();
 
-        $out = $obj->exposeGetPatternStreamResourceDict('/Sh9 sh /I2 Do');
+        $this->assertNotNull($gradientId);
 
+        $out = $obj->exposeGetPatternStreamResourceDict('/Sh' . $gradientId . ' sh /I2 Do');
+
+        $this->assertStringContainsString(' /Pattern <<', $out);
         $this->assertStringContainsString(' /XObject <<', $out);
     }
 
@@ -3871,7 +3874,7 @@ public function testGetOutEmbeddedFilesSkipsUnreadableSourceFiles(): void
         $throwingFile = new class () extends \Com\Tecnick\File\File {
             public function fileGetContents(string $path): string
             {
-                throw new \Com\Tecnick\Pdf\Exception('mock unreadable file');
+                throw new \Com\Tecnick\Pdf\Exception('mock unreadable file: ' . $path);
             }
         };
         $this->setObjectProperty($obj, 'file', $throwingFile);