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Informations about the package fluent-assert
Fluent Assert
This library is built upon webmozart/assert and provides a fluent interface
for assertions, which allows for a more compact
set of assertions on the same value.
It is a useful tool for those who want to use webmozart/assert but prefer a more fluent interface.
Built with love ❤️
Installation
Use Composer to install the library.
Differences
There are a few differences between this library and webmozart/assert:
- The
all*methods don't use the source methods inwebmozart/assert.- They work as you would expect, but they use
each()internally to apply the assertions to each value. See Iterative Assertions.
- They work as you would expect, but they use
- The exception throw on failures are different.
\ExeQue\FluentAssert\Exceptions\InvalidArgumentExceptionis thrown on failures.- It extends
\Webmozart\Assert\InvalidArgumentException.
- It extends
\ExeQue\FluentAssert\Exceptions\BulkInvalidArgumentExceptionis thrown on grouped assertions- It extends
\ExeQue\FluentAssert\Exceptions\InvalidArgumentException. - It provides multiple exceptions in the
getExceptions()method. - See Grouped Assertions.
- It extends
\ExeQue\FluentAssert\Exceptions\IndexedInvalidArgumentExceptionis thrown on positional or iterative assertions- It extends
\ExeQue\FluentAssert\Exceptions\InvalidArgumentException. - It provides the index of the failing assertion in the
getIndex()method. - It provides the original message in the
getOriginalMessage()method. - See Iterative Assertions.
- It extends
Example
The example from webmozart/assert can be rewritten as:
Grouped Assertions
The fluent interface provides a and() and or() method to group assertions.
This is useful when you want to make multiple assertions at once and a singular combined error.
Iterative Assertions
The each() method allows you to iterate over an array or an ArrayAccess object and apply assertions to each value.
The errors thrown will have a prefix of failing index applied.
The IndexedInvalidArgumentException can provide the index that failed use getIndex() and the original message using
getOriginalMessage().
Positional Assertions
The at() method allows you to assert a value at a specific index in an array or an ArrayAccess object.
It automatically calls keyExists() on the index before applying the assertion.
The errors thrown will have a prefix of failing index applied.
Conditional Assertions
Sometimes you only want to apply certain assertions if a condition is met or not. The when() method allows you to do
this.
Inverted Assertions
The not() method allows you to invert the assertion. This is useful when the assertions MUST fail.
Assertions
All assertions from webmozart/assert are available. See here
An extended implementation of webmozart/assert is available in the ExeQue\FluentAssert\Base class.
The following additional assertions are available:
| Method | Description |
|---|---|
hasIndices($value, string $message = '') |
Check that a value has indices (array or ArrayAccess) |
arrayContains($array, mixed $value, string $message = '') |
Check that a value contains another value |
type($value, string $type, string $message = '') |
Check that a value is of a certain type (using get_debug_type()) |
publicPropertyExists($value, string $name, string $message = '') |
Check that a value has a public property |
protectedPropertyExists($value, string $name, string $message = '') |
Check that a value has a protected property |
privatePropertyExists($value, string $name, string $message = '') |
Check that a value has a private property |
staticPropertyExists($value, string $name, string $message = '') |
Check that a value has a static property |
instancedPropertyExists($value, string $name, string $message = '') |
Check that a value has an instanced property |
Development
The library uses code generation to create definitions for all methods present in webmozart/assert.
To trigger the generation run:
Testing
You can run the tests using the following command:
License
This library is open-sourced software licensed under the MIT license.
Appreciation
Big thanks to Bernard Schussek (and community) for the webmozart/assert.
It is one of the first dependencies I include in any project and I use it extensively.
