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Package phpunit-given
Short Description An alternative to PHPUnit's ReturnValueMap and ReturnCallback. A convenient solution to migrate from Prophecy.
License BSD-3-Clause
Homepage https://github.com/olvlvl/phpunit-given
Informations about the package phpunit-given
olvlvl/phpunit-given
olvlvl/phpunit-given provides an alternative to PHPUnit's ReturnValueMap and ReturnCallback, as well as a convenient solution to migrate from Prophecy.
Disclaimer
In most cases ReturnCallback
with match
can be used effectively. Don't use this package if you're comfortable with these and don't need extra features.
Usage
This is a simple example, more use cases below.
Installation
Motivation
Coming from Prophecy, [C# Moq](), Golang Mock, or Kotlin Mockk, one would expect at least one of the following examples to work, but they do not.
To return a value given certain arguments, one is expected to use ReturnValueMap or ReturnCallback. ReturnValueMap
seems simple enough, but because it looks for exact matches it fails when objects are included in the arguments, unless they are the same instances. Besides, ReturnValueMap
does not support constraints, you can forget doing anything fancy with it. That leaves us with ReturnCallback
, which can be used effectively with match
but requires the introduction of logic in the test, a practice that is discouraged.
My motivation for creating olvlvl/phpunit-given, is to have an alternative to ReturnValueMap and ReturnCallback, that looks similar to what we find in other testing frameworks, and that allows easy migration from Prophecy.
Some PHPUnit issues, for reference:
- Feature similar to withConsecutive(), but without checking order
- Improvements on withConsecutive with return
- Remove withConsecutive()
- Symphony: Remove occurrences of withConsecutive()
Use cases
Comparing with objects
ReturnValueMap doesn't work with objects because it uses strict equality when comparing
arguments. The following code throws a TypeError
exception because ReturnValueMap
cannot find a match and defaults to a null
value.
olvlvl/phpunit-given substitutes values with Assert::equalTo()
and compares arguments using constraints. Having objects in the arguments is not a problem.
Note: You can use Assert::identicalTo()
to check for the same instance.
Using constraints
We established that values are substituted with Assert::equalTo()
internally. Instead of values, you can also use constraints:
Migrating from Prophecy
olvlvl/phpunit-given is a convenient solution to migrate from Prophecy because the code is quite similar:
throw()
is an alternative to willThrow()
, and you can mismatch return()
and throw()
:
Contrary to Prophecy, olvlvl/phpunit-given does not return null
by default, instead it throws an exception:
Continuous Integration
The project is continuously tested by GitHub actions.
Code of Conduct
This project adheres to a Contributor Code of Conduct. By participating in this project and its community, you're expected to uphold this code.
Contributing
See CONTRIBUTING for details.
License
olvlvl/phpunit-given is released under the BSD-3-Clause.