assert

by webmozart

webmozart / assert

Assertions to validate method input/output with nice error messages.

6.5K Stars 98 Forks Last release: 4 months ago (1.9.1) MIT License 176 Commits 14 Releases

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Webmozart Assert

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This library contains efficient assertions to test the input and output of your methods. With these assertions, you can greatly reduce the amount of coding needed to write a safe implementation.

All assertions in the

Assert
class throw an

\InvalidArgumentException
if they fail.

FAQ

What's the difference to beberlei/assert?

This library is heavily inspired by Benjamin Eberlei's wonderful assert package, but fixes a usability issue with error messages that can't be fixed there without breaking backwards compatibility.

This package features usable error messages by default. However, you can also easily write custom error messages:

Assert::string($path, 'The path is expected to be a string. Got: %s');

In beberlei/assert, the ordering of the

%s
placeholders is different for every assertion. This package, on the contrary, provides consistent placeholder ordering for all assertions:
  • %s
    : The tested value as string, e.g.
    "/foo/bar"
    .
  • %2$s
    ,
    %3$s
    , ...: Additional assertion-specific values, e.g. the minimum/maximum length, allowed values, etc.

Check the source code of the assertions to find out details about the additional available placeholders.

Installation

Use Composer to install the package:

$ composer require webmozart/assert

Example

use Webmozart\Assert\Assert;

class Employee { public function __construct($id) { Assert::integer($id, 'The employee ID must be an integer. Got: %s'); Assert::greaterThan($id, 0, 'The employee ID must be a positive integer. Got: %s'); } }

If you create an employee with an invalid ID, an exception is thrown:

new Employee('foobar');
// => InvalidArgumentException:
//    The employee ID must be an integer. Got: string

new Employee(-10); // => InvalidArgumentException: // The employee ID must be a positive integer. Got: -10

Assertions

The

Assert
class provides the following assertions:

Type Assertions

Method

Description

string($value, $message = '')
| Check that a value is a string
stringNotEmpty($value, $message = '')
| Check that a value is a non-empty string
integer($value, $message = '')
| Check that a value is an integer
integerish($value, $message = '')
| Check that a value casts to an integer
float($value, $message = '')
| Check that a value is a float
numeric($value, $message = '')
| Check that a value is numeric
natural($value, $message= ''')
| Check that a value is a non-negative integer
boolean($value, $message = '')
| Check that a value is a boolean
scalar($value, $message = '')
| Check that a value is a scalar
object($value, $message = '')
| Check that a value is an object
resource($value, $type = null, $message = '')
| Check that a value is a resource
isCallable($value, $message = '')
| Check that a value is a callable
isArray($value, $message = '')
| Check that a value is an array
isTraversable($value, $message = '')
(deprecated) | Check that a value is an array or a
\Traversable
isIterable($value, $message = '')
| Check that a value is an array or a
\Traversable
isCountable($value, $message = '')
| Check that a value is an array or a
\Countable
isInstanceOf($value, $class, $message = '')
| Check that a value is an
instanceof
a class
isInstanceOfAny($value, array $classes, $message = '')
| Check that a value is an
instanceof
at least one class on the array of classes
notInstanceOf($value, $class, $message = '')
| Check that a value is not an
instanceof
a class
isAOf($value, $class, $message = '')
| Check that a value is of the class or has one of its parents
isAnyOf($value, array $classes, $message = '')
| Check that a value is of at least one of the classes or has one of its parents
isNotA($value, $class, $message = '')
| Check that a value is not of the class or has not one of its parents
isArrayAccessible($value, $message = '')
| Check that a value can be accessed as an array
uniqueValues($values, $message = '')
| Check that the given array contains unique values

Comparison Assertions

Method

Description

true($value, $message = '')
| Check that a value is
true
false($value, $message = '')
| Check that a value is
false
notFalse($value, $message = '')
| Check that a value is not
false
null($value, $message = '')
| Check that a value is
null
notNull($value, $message = '')
| Check that a value is not
null
isEmpty($value, $message = '')
| Check that a value is
empty()
notEmpty($value, $message = '')
| Check that a value is not
empty()
eq($value, $value2, $message = '')
| Check that a value equals another (
==
)
notEq($value, $value2, $message = '')
| Check that a value does not equal another (
!=
)
same($value, $value2, $message = '')
| Check that a value is identical to another (
===
)
notSame($value, $value2, $message = '')
| Check that a value is not identical to another (
!==
)
greaterThan($value, $value2, $message = '')
| Check that a value is greater than another
greaterThanEq($value, $value2, $message = '')
| Check that a value is greater than or equal to another
lessThan($value, $value2, $message = '')
| Check that a value is less than another
lessThanEq($value, $value2, $message = '')
| Check that a value is less than or equal to another
range($value, $min, $max, $message = '')
| Check that a value is within a range
inArray($value, array $values, $message = '')
| Check that a value is one of a list of values
oneOf($value, array $values, $message = '')
| Check that a value is one of a list of values (alias of
inArray
)

String Assertions

You should check that a value is a string with

Assert::string()
before making any of the following assertions.

Method

Description

contains($value, $subString, $message = '')
| Check that a string contains a substring
notContains($value, $subString, $message = '')
| Check that a string does not contain a substring
startsWith($value, $prefix, $message = '')
| Check that a string has a prefix
notStartsWith($value, $prefix, $message = '')
| Check that a string does not have a prefix
startsWithLetter($value, $message = '')
| Check that a string starts with a letter
endsWith($value, $suffix, $message = '')
| Check that a string has a suffix
notEndsWith($value, $suffix, $message = '')
| Check that a string does not have a suffix
regex($value, $pattern, $message = '')
| Check that a string matches a regular expression
notRegex($value, $pattern, $message = '')
| Check that a string does not match a regular expression
unicodeLetters($value, $message = '')
| Check that a string contains Unicode letters only
alpha($value, $message = '')
| Check that a string contains letters only
digits($value, $message = '')
| Check that a string contains digits only
alnum($value, $message = '')
| Check that a string contains letters and digits only
lower($value, $message = '')
| Check that a string contains lowercase characters only
upper($value, $message = '')
| Check that a string contains uppercase characters only
length($value, $length, $message = '')
| Check that a string has a certain number of characters
minLength($value, $min, $message = '')
| Check that a string has at least a certain number of characters
maxLength($value, $max, $message = '')
| Check that a string has at most a certain number of characters
lengthBetween($value, $min, $max, $message = '')
| Check that a string has a length in the given range
uuid($value, $message = '')
| Check that a string is a valid UUID
ip($value, $message = '')
| Check that a string is a valid IP (either IPv4 or IPv6)
ipv4($value, $message = '')
| Check that a string is a valid IPv4
ipv6($value, $message = '')
| Check that a string is a valid IPv6
email($value, $message = '')
| Check that a string is a valid e-mail address
notWhitespaceOnly($value, $message = '')
| Check that a string contains at least one non-whitespace character

File Assertions

Method

Description

fileExists($value, $message = '')
| Check that a value is an existing path
file($value, $message = '')
| Check that a value is an existing file
directory($value, $message = '')
| Check that a value is an existing directory
readable($value, $message = '')
| Check that a value is a readable path
writable($value, $message = '')
| Check that a value is a writable path

Object Assertions

Method

Description

classExists($value, $message = '')
| Check that a value is an existing class name
subclassOf($value, $class, $message = '')
| Check that a class is a subclass of another
interfaceExists($value, $message = '')
| Check that a value is an existing interface name
implementsInterface($value, $class, $message = '')
| Check that a class implements an interface
propertyExists($value, $property, $message = '')
| Check that a property exists in a class/object
propertyNotExists($value, $property, $message = '')
| Check that a property does not exist in a class/object
methodExists($value, $method, $message = '')
| Check that a method exists in a class/object
methodNotExists($value, $method, $message = '')
| Check that a method does not exist in a class/object

Array Assertions

Method

Description

keyExists($array, $key, $message = '')
| Check that a key exists in an array
keyNotExists($array, $key, $message = '')
| Check that a key does not exist in an array
validArrayKey($key, $message = '')
| Check that a value is a valid array key (int or string)
count($array, $number, $message = '')
| Check that an array contains a specific number of elements
minCount($array, $min, $message = '')
| Check that an array contains at least a certain number of elements
maxCount($array, $max, $message = '')
| Check that an array contains at most a certain number of elements
countBetween($array, $min, $max, $message = '')
| Check that an array has a count in the given range
isList($array, $message = '')
| Check that an array is a non-associative list
isNonEmptyList($array, $message = '')
| Check that an array is a non-associative list, and not empty
isMap($array, $message = '')
| Check that an array is associative and has strings as keys
isNonEmptyMap($array, $message = '')
| Check that an array is associative and has strings as keys, and is not empty

Function Assertions

Method

Description

throws($closure, $class, $message = '')
| Check that a function throws a certain exception. Subclasses of the exception class will be accepted.

Collection Assertions

All of the above assertions can be prefixed with

all*()
to test the contents of an array or a
\Traversable
:
Assert::allIsInstanceOf($employees, 'Acme\Employee');

Nullable Assertions

All of the above assertions can be prefixed with

nullOr*()
to run the assertion only if it the value is not
null
:
Assert::nullOrString($middleName, 'The middle name must be a string or null. Got: %s');

Extending Assert

The

Assert
class comes with a few methods, which can be overridden to change the class behaviour. You can also extend it to add your own assertions.

Overriding methods

Overriding the following methods in your assertion class allows you to change the behaviour of the assertions:

  • public static function __callStatic($name, $arguments)
    • This method is used to 'create' the
      nullOr
      and
      all
      versions of the assertions.
  • protected static function valueToString($value)
    • This method is used for error messages, to convert the value to a string value for displaying. You could use this for representing a value object with a
      __toString
      method for example.
  • protected static function typeToString($value)
    • This method is used for error messages, to convert the a value to a string representing its type.
  • protected static function strlen($value)
    • This method is used to calculate string length for relevant methods, using the
      mb_strlen
      if available and useful.
  • protected static function reportInvalidArgument($message)
    • This method is called when an assertion fails, with the specified error message. Here you can throw your own exception, or log something.

Authors

Contribute

Contributions to the package are always welcome!

License

All contents of this package are licensed under the MIT license.

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