______
_\____\___
= = ==(____MA____)
\_____\___________________,-~~~~~~~`-.._
/ o o o o o o o o o o o o o o o o |\_
`~-.__ __..----..__ )
`---~~\___________/------------`````
= ===(_________)
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You can create a plane object and an airport object
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In order to create a plane object you need to have an airport object argument
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the Airport used as argument in the plane object is used as a home airport (base). This is where the plane is based at the moment of creation.
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the Airport object is created with a name argument (a String)
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a Plane object can land : the argument is the destination airport
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a Plane object can take_off : the argument is the departure airport
- You can tell an airport that no landing is possible with the @prevent_landing attribute, which prevents any plane from landing at this airport
- You can tell an airport that no take_off is possible which prevents any plane from taking_off from this airport
- You can block both landing and take_off by applying @blocked_airport to this airport
- You cannot land a plane if the plane is already landed and vice versa, you cannot take_off if you are already in the air.
- You can confirm from which airport you have taken off by using the confirm_take_off method on a plane object
We have a request from a client to write the software to control the flow of planes at an airport. The planes can land and take off provided that the weather is sunny. Occasionally it may be stormy, in which case no planes can land or take off. Here are the user stories that we worked out in collaboration with the client:
As an air traffic controller
So I can get passengers to a destination
I want to instruct a plane to land at an airport
As an air traffic controller
So I can get passengers on the way to their destination
I want to instruct a plane to take off from an airport and confirm that it is no longer in the airport
As an air traffic controller
To ensure safety
I want to prevent takeoff when weather is stormy
As an air traffic controller
To ensure safety
I want to prevent landing when weather is stormy
As an air traffic controller
To ensure safety
I want to prevent landing when the airport is full
As the system designer
So that the software can be used for many different airports
I would like a default airport capacity that can be overridden as appropriate
Your task is to test drive the creation of a set of classes/modules to satisfy all the above user stories. You will need to use a random number generator to set the weather (it is normally sunny but on rare occasions it may be stormy). In your tests, you'll need to use a stub to override random weather to ensure consistent test behaviour.
Your code should defend against edge cases such as inconsistent states of the system ensuring that planes can only take off from airports they are in; planes that are already flying cannot takes off and/or be in an airport; planes that are landed cannot land again and must be in an airport, etc.
For overriding random weather behaviour, please read the documentation to learn how to use test doubles: https://www.relishapp.com/rspec/rspec-mocks/docs . There’s an example of using a test double to test a die that’s relevant to testing random weather in the test.
Please create separate files for every class, module and test suite.
In code review we'll be hoping to see:
- All tests passing
- High Test coverage (>95% is good)
- The code is elegant: every class has a clear responsibility, methods are short etc.
Reviewers will potentially be using this code review rubric. Referring to this rubric in advance will make the challenge somewhat easier. You should be the judge of how much challenge you want this weekend.
BONUS
- Write an RSpec feature test that lands and takes off a number of planes
Note that is a practice 'tech test' of the kinds that employers use to screen developer applicants. More detailed submission requirements/guidelines are in CONTRIBUTING.md
Finally, don’t overcomplicate things. This task isn’t as hard as it may seem at first.
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Submit a pull request early. There are various checks that happen automatically when you send a pull request. Fix these issues if you can. Green is good.
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Finally, please submit a pull request before Monday at 9am with your solution or partial solution. However much or little amount of code you wrote please please please submit a pull request before Monday at 9am.