cleanup() public method

Destroys the cache, freeing memory and removing any created artifacts
public cleanup ( ) : void
return void
 /**
  * @return void
  */
 public function testGetStringAtIndexShouldWorkWithMultilineStrings()
 {
     $resourcePath = $this->getResourcePath('one_sheet_with_shared_multiline_strings.xlsx');
     $sharedStringsHelper = new SharedStringsHelper($resourcePath);
     $sharedStringsHelper->extractSharedStrings();
     $sharedString = $sharedStringsHelper->getStringAtIndex(0);
     $this->assertEquals("s1\nA1", $sharedString);
     $sharedString = $sharedStringsHelper->getStringAtIndex(24);
     $this->assertEquals("s1\nE5", $sharedString);
     $sharedStringsHelper->cleanup();
 }