Class: Matchi::RaiseException

Inherits:

BasicObject

Defined in:

lib/matchi/raise_exception.rb

Overview

**Expecting errors** matcher.

Instance Method Summary

• #initialize(expected) ⇒ RaiseException constructor

  Initialize the matcher with a descendant of class Exception.

• #matches? ⇒ Boolean

  Comparison between actual and expected values.

Constructor Details

#initialize(expected) ⇒ RaiseException

Initialize the matcher with a descendant of class Exception.

Examples:

Divided by 0 matcher

Matchi::RaiseException.new(ZeroDivisionError)

Parameters:

• expected (.exception) —

  The class of the expected exception.

# File 'lib/matchi/raise_exception.rb', line 10

def initialize(expected)
  @expected = expected
end

Instance Method Details

#matches? ⇒ Boolean

Returns Comparison between actual and expected values.

Examples:

Is it raising NameError?

raise_exception = Matchi::RaiseException.new(NameError)
raise_exception.matches? { Boom } # => true

Yield Returns:

• (#object_id) —

  the actual value to compare to the expected one.

Returns:

• (Boolean) —

  Comparison between actual and expected values.

# File 'lib/matchi/raise_exception.rb', line 21

def matches?
  yield
rescue @expected
  true
else
  false
end