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lesson4's Issues

There is no README.md

It isn't obvious what to do in this task. README.md with explaination of task (and a link to some tests) would be very useful.

почти у всех упал один и тот же тест.

Объясните, пожалуйста, почему тест -----5 не должен вычисляться?
В задании не было прописано о невалидности подобного выражения, и большинство распространенных калькуляторов без проблем вычислят этот тест.

Expression format

Are negative numbers always presented as (-N), e.g. 5+(-2), 5-(-2), or there can be something like 5+-2 or 5--2, which should be processed as correct input?

Mail

Могли бы вы оповещать нас по почте ([email protected]) когда выкладываете задания?

почти у всех упал один и тот же тест.

Объясните, пожалуйста, почему тест -----5 не должен вычисляться?
В задании не было прописано о невалидности подобного выражения, и многие из распространенных калькуляторов без проблем вычислят этот тест.

There is some issues(

New AS doesn't support old gradle, so Studio updates it. And the robolectric dies. Can you update both gradle and robolectric?

Adding the tests

"Вы должны добавить тесты на вашу реализацию CalculationEngine" it means that i should add lines like "Assert.assertEquals(2d, CalculationEngineFactory.defaultEngine().calculate("1+1"));" to DummyTest.java?
And what epsilon we should use for determine division by zero? Or we should ignore it and write Infinity or something like 1E-5?

Проект не собирается

При попытке собрать получаю ошибку:

Error:A problem occurred configuring project ':app'.
> Module version org.robolectric:robolectric:2.3 depends on libraries but is not a library itself

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