- ];
- $retval = null;
- $output = wfShellExec( $cmd, $retval );
- $this->assertTrue( $retval === 0, "ImageMagick's identify command should return success" );
+ )->execute();
+ $this->assertSame( 0,
+ $result->getExitCode(),
+ "ImageMagick's identify command should return success"
+ );