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OSv
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4
Experiences
Pros
3
Cons
1
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Pro
Quick booting
OSv is able to boot in less than a second.
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Con
Can only run one application at a time
Since it tries to have maximum performance, OSv can only afford to run one application per hypervisor at a time.
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Pro
Amazing performance
Since OSv is created to run one single application on top of a hypervisor, it offers great performance and speed.
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Supports multiple platforms
OSv can run applications written in multiple programming languages and that run on multiple different platforms. Such as Java, C, Ruby, Node and Scala. With support for other languages on the way.
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Mirage OS
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4
Experiences
Pros
3
Cons
1
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Pro
Large collection of libraries available
There are more than 100 libraries compatible with MirageOS available and more are being developed everyday.
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Con
May be too much for regular development work
Letting developers work closer to the metal also makes them lose a lot of the useful abstractions a normal OS has which are not built for no reason. Considering this, it may not be a good idea to always use MirageOS for deploying an application.
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Pro
Built with security in mind
What MirageOS does in simple terms is to provide only the minimal needed for an app to run. It provides only the required network and hardware drivers needed to execute. Using this approach it minimizes the attack surface for potential hackers since they don't have any shell to log into or any other insecure cruft that other deployment methods, such as full operating systems have.
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OCaml
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unittest
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10
Experiences
Pros
6
Cons
4
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Pro
Part of the Python standard library
PyUnit has been a part of the Python standard library since version 2.1 as the unittest module. This makes it widely available to developers without the need to install additional modules since it's coming out of the box with Python.
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Con
camelCase naming
Idiomatic python code uses snake_case, but this was ported so closely from JUnit that it has retained java-style camelCase method names. That can be jarring.
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Pro
Flexible test case execution
The way tests are run is through: if name == 'main': unittest.main() Then unittest.main() builds a TestSuite object that contains all the tests that have method names starting with "test", then a TextTestRunnerwhich then executes each method and prints the results. But individual test cases can be executed simply by specifying their names on the terminal: python unittest_program.py testProgram.testGetFeedPostingHost The default output is usually pretty concise, but it can be more verbose simply by adding a -v flag in the end when calling the test from the command line. So unittest can be considered pretty flexible when it comes to test case execution.
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Con
No color output
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Pro
Promotes grouping related tests into common test suites
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Con
The API can make the test code's intent hard to understand
Although unittest does not have a huge API that needs to be remembered, it has too much support for abstraction, this makes the test code intent's unclear.
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Pro
Very fast test collection
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Con
Verbose
Too much boilerplate code is needed.
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Pro
Easy to use for people who are comfortable with testing in other languages
Since pyUnit is a derivative of xUnit and it's quite similar to other xUnit frameworks, it's quite easy for people with not much Python background to relate to.
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Very precise test duration reports
Unittest reports tests duration in milliseconds
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