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  • Extends
    PHPUnit\Framework\Constraint\Constraint
  • Implements
    Countable
    PHPUnit\Framework\SelfDescribing
Methods
public PHPUnit\Framework\Constraint\Constraint::count() : int
 

Counts the number of constraint elements.

public PHPUnit\Framework\Constraint\Constraint::evaluate( $other, string $description = '', bool $returnResult = false) : ?bool
 

Evaluates the constraint for parameter $other.

If $returnResult is set to false (the default), an exception is thrown
in case of a failure. null is returned otherwise.

If $returnResult is true, the result of the evaluation is returned as
a boolean value instead: true in case of success, false in case of a
failure.

public toString() : string
 

Returns a string representation of the constraint.

Methods
protected additionalFailureDescription( $other) : string
 

Return additional failure description where needed.

The function can be overridden to provide additional failure
information like a diff

protected PHPUnit\Framework\Constraint\Constraint::exporter() : SebastianBergmann\Exporter\Exporter
protected PHPUnit\Framework\Constraint\Constraint::fail( $other, $description, ?SebastianBergmann\Comparator\ComparisonFailure $comparisonFailure = NULL) : void
 

Throws an exception for the given compared value and test description.

protected failureDescription( $other) : string
 

Returns the description of the failure.

The beginning of failure messages is "Failed asserting that" in most
cases. This method should return the second part of that sentence.

protected PHPUnit\Framework\Constraint\Constraint::failureDescriptionInContext(PHPUnit\Framework\Constraint\Operator $operator, $role, $other) : string
 

Returns the description of the failure when this constraint appears in
context of an $operator expression.

The purpose of this method is to provide meaningful failue description
in context of operators such as LogicalNot. Native PHPUnit constraints
are supported out of the box by LogicalNot, but externally developed
ones had no way to provide correct messages in this context.

The method shall return empty string, when it does not handle
customization by itself.

protected matches( $other) : bool
 

Evaluates the constraint for parameter $other. Returns TRUE if the
constraint is met, FALSE otherwise.

protected PHPUnit\Framework\Constraint\Constraint::reduce() : self
 

Reduces the sub-expression starting at $this by skipping degenerate
sub-expression and returns first descendant constraint that starts
a non-reducible sub-expression.

Returns $this for terminal constraints and for operators that start
non-reducible sub-expression, or the nearest descendant of $this that
starts a non-reducible sub-expression.

A constraint expression may be modelled as a tree with non-terminal
nodes (operators) and terminal nodes. For example:

 LogicalOr           (operator, non-terminal)
 + LogicalAnd        (operator, non-terminal)
 | + IsType('int')   (terminal)
 | + GreaterThan(10) (terminal)
 + LogicalNot        (operator, non-terminal)
   + IsType('array') (terminal)

A degenerate sub-expression is a part of the tree, that effectively does
not contribute to the evaluation of the expression it appears in. An example
of degenerate sub-expression is a BinaryOperator constructed with single
operand or nested BinaryOperators, each with single operand. An
expression involving a degenerate sub-expression is equivalent to a
reduced expression with the degenerate sub-expression removed, for example

 LogicalAnd          (operator)
 + LogicalOr         (degenerate operator)
 | + LogicalAnd      (degenerate operator)
 |   + IsType('int') (terminal)
 + GreaterThan(10)   (terminal)

is equivalent to

 LogicalAnd          (operator)
 + IsType('int')     (terminal)
 + GreaterThan(10)   (terminal)

because the subexpression

 + LogicalOr
   + LogicalAnd
     + -

is degenerate. Calling reduce() on the LogicalOr object above, as well
as on LogicalAnd, shall return the IsType('int') instance.

Other specific reductions can be implemented, for example cascade of
LogicalNot operators

 + LogicalNot
   + LogicalNot
     +LogicalNot
      + IsTrue

can be reduced to

 LogicalNot
 + IsTrue
protected PHPUnit\Framework\Constraint\Constraint::toStringInContext(PHPUnit\Framework\Constraint\Operator $operator, $role) : string
 

Returns a custom string representation of the constraint object when it
appears in context of an $operator expression.

The purpose of this method is to provide meaningful descriptive string
in context of operators such as LogicalNot. Native PHPUnit constraints
are supported out of the box by LogicalNot, but externally developed
ones had no way to provide correct strings in this context.

The method shall return empty string, when it does not handle
customization by itself.

© 2023 Bruce Wells
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