add new assertion

Signed-off-by: rahul <rcsofttech85@gmail.com>

Author: rcsofttech85

bin/view-csv

@@ -33,7 +33,7 @@ $command = (new SingleCommandApplication())
         $headers = $csvFileHandler->extractHeader($csvFile);
 
         if (!$headers) {
-            $io->error('could not extract headers');
+            $io->error('invalid csv file');
             return Command::FAILURE;
         }
 

tests/Integration/ViewCsvCommandTest.php

@@ -68,6 +68,9 @@ public function throwExceptionIfFileIsInvalid(string $file): void
     {
         $command = "php bin/view-csv {$file}";
         exec($command, $output, $exitCode);
+        $actualOutput = implode("\n", $output);
+
+        $this->assertStringContainsString('invalid csv file', $actualOutput);
         $this->assertSame(1, $exitCode);
         unlink($file);
     }