LexerTests Should_return_empty_token_list_when_put_empty_expression
LexerTests Should_tokenize_single_plus_operator
Add TokenTests
LexerTests Should_tokenize_single_digit
LexerTests Should_tokenize_plus_and_number
LexerTests Should_skip_spaces
Extract Tokenizer class
LexerTests Should_tokenize_complex_experssion
ParserTests Should_return_empty_list_when_put_empty_list
Merge remote-tracking branch 'origin/master'