Class: Matchi::BeAnInstanceOf

Inherits:
Object
  • Object
show all
Defined in:
lib/matchi/be_an_instance_of.rb

Overview

Type/class matcher.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expected) ⇒ BeAnInstanceOf

Initialize the matcher with (the name of) a class or module.

Examples:

require "matchi/be_an_instance_of"

Matchi::BeAnInstanceOf.new(String)

Parameters:

  • expected (Class, #to_s) —

    The expected class name.



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# File 'lib/matchi/be_an_instance_of.rb', line 17

def initialize(expected)
  @expected = String(expected)
end

Instance Attribute Details

#expected ⇒ String (readonly)

Returns The expected class name.

Returns:

  • (String) —

    The expected class name.



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# File 'lib/matchi/be_an_instance_of.rb', line 7

def expected
  @expected
end

Instance Method Details

#inspect ⇒ Object

A string containing a human-readable representation of the matcher.



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# File 'lib/matchi/be_an_instance_of.rb', line 40

def inspect
  "#{self.class}(#{expected})"
end

#matches? ⇒ Boolean

Boolean comparison between the class of the actual value and the expected class.

Examples:

require "matchi/be_an_instance_of"

matcher = Matchi::BeAnInstanceOf.new(String)

matcher.expected           # => "String"
matcher.matches? { "foo" } # => true

Yield Returns:

  • (#class) —

    the actual value to compare to the expected one.

Returns:

  • (Boolean) —

    Comparison between actual and expected values.



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# File 'lib/matchi/be_an_instance_of.rb', line 35

def matches?
  self.class.const_get(expected).equal?(yield.class)
end

#to_s ⇒ Object

Returns a string representing the matcher.



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# File 'lib/matchi/be_an_instance_of.rb', line 45

def to_s
  "be an instance of #{expected}"
end