---- :unittest.toLower - output
'CONVERT this to lower case' 'convert this to lower case' .
'123Conver tHIs to Lower case' '123conver this to lower case' .
'Convert this TO lower case123' 'convert this to lower case123' .
'CONVERT THIS TO LOWER CASE' 'convert this to lower case' .
'convert this to lower case' 'convert this to lower case' .
'' '' .
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