Validate if jsignpdf jar exists

Author: vitormattos

src/Sign/JSignService.php

@@ -91,6 +91,7 @@ private function commandSign(JSignParam $params)
         if (!$jSignPdf && class_exists('JSignPDF\JSignPDFBin\JSignPdfPathService')) {
             $jSignPdf = \JSignPDF\JSignPDFBin\JSignPdfPathService::jSignPdfJarPath();
         }
+        $this->throwIf(!file_exists($jSignPdf), 'Jar of JSignPDF not found on path: '. $jSignPdf);
 
         return "$java -jar $jSignPdf $pdf -ksf $certificate -ksp '{$params->getPassword()}' {$params->getJSignParameters()} -d {$params->getPathPdfSigned()}";
     }

tests/JSignPDFTest.php

@@ -82,6 +82,13 @@ public function testSignWhenPasswordIsInvalid()
         $this->service->sign($params);
     }
 
+    public function testSignWhenJarNotFound()
+    {
+        $this->expectExceptionMessageMatches('/Jar of JSignPDF not found on path/');
+        $params = JSignParamBuilder::instance()->withDefault()->setIsUseJavaInstalled(true);
+        $this->service->sign($params);
+    }
+
     public function testSignWhenJavaNotFound()
     {
         $javaVersion    = exec("java -version 2>&1");