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Invalid inputs are not tested in random tests.
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The instructions say "Input string will contain: spaces, numbers (may be integers and floats), and arithmetic operations.", and all the example tests and all the test suite tests I passed so far have spaces between the numbers and operators, but then in the test suite I just ran into this:
Did you intend for that one to have space separators as well, or should an input string still be considered well-formed even without the "will contain" spaces?