Class: Smartest::ChangeMatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/smartest/matchers.rb

Constant Summary collapse

UNSET = 
Object.new

Instance Method Summary collapse

Constructor Details

#initialize(value_block) ⇒ ChangeMatcher

Returns a new instance of ChangeMatcher.



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# File 'lib/smartest/matchers.rb', line 186

def initialize(value_block)
  @value_block = value_block
  @expected_from = UNSET
  @expected_to = UNSET
  @expected_delta = UNSET
  reset_result
end

Instance Method Details

#by(expected_delta) ⇒ Object 



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# File 'lib/smartest/matchers.rb', line 204

def by(expected_delta)
  @expected_delta = expected_delta
  self
end

#does_not_match?(actual) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smartest/matchers.rb', line 216

def does_not_match?(actual)
  run_change(actual)
  return false unless @callable

  negated_failures.empty?
end

#failure_message ⇒ Object 



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# File 'lib/smartest/matchers.rb', line 223

def failure_message
  return "expected a block to change value" unless @callable

  "expected value to #{expected_description}, but #{observed_description}#{failed_modifier_description}"
end

#from(expected) ⇒ Object 



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# File 'lib/smartest/matchers.rb', line 194

def from(expected)
  @expected_from = expected
  self
end

#matches?(actual) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smartest/matchers.rb', line 209

def matches?(actual)
  run_change(actual)
  return false unless @callable

  positive_failures.empty?
end

#negated_failure_message ⇒ Object 



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# File 'lib/smartest/matchers.rb', line 229

def negated_failure_message
  return "expected a block not to change value" unless @callable

  "expected value not to change, but #{observed_description}"
end

#to(expected) ⇒ Object 



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# File 'lib/smartest/matchers.rb', line 199

def to(expected)
  @expected_to = expected
  self
end