Class: Peck::Should

Inherits:
Object show all
Defined in:
lib/peck/expectations.rb

Defined Under Namespace

Classes: Proxy, Specification

Constant Summary collapse

KILL_METHODS_RE =

Kills ==, ===, =~, eql?, equal?, frozen?, instance_of?, is_a?, kind_of?, nil?, respond_to?, tainted?

/\?|^\W+$/
PREDICATE_METHOD_RE = 
/\w[^?]\z/

Instance Method Summary collapse

Constructor Details

#initialize(this) ⇒ Should

Returns a new instance of Should.



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# File 'lib/peck/expectations.rb', line 35

def initialize(this)
  @this = this
  @negated = false
  Thread.current['peck-spec'].expectations << self
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/peck/expectations.rb', line 136

def method_missing(name, *args, &block)
  name = "#{name}?" if name.to_s =~ PREDICATE_METHOD_RE

  desc = @negated ? "not " : ""
  desc << @this.inspect << "." << name.to_s
  desc << "(" << args.map{|x|x.inspect}.join(", ") << ") failed"

  satisfy(desc) { |x| x.__send__(name, *args, &block) }
end

Instance Method Details

#be(*args, &block) ⇒ Object 



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# File 'lib/peck/expectations.rb', line 46

def be(*args, &block)
  if args.empty?
    self
  else
    block = args.shift unless block_given?
    satisfy(*args, &block)
  end
end

#change(*expected) ⇒ Object 



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# File 'lib/peck/expectations.rb', line 69

def change(*expected)
  block_binding = @this.send(:binding)

  before = expected.in_groups_of(2).map do |expression, _|
    eval(expression, block_binding)
  end

  block_result = @this.call

  expected.in_groups_of(2).each_with_index do |(expression, change), index|
    after = eval(expression, block_binding)
    actual = after - before[index]

    if @negated
      description = "#{expression} changed"
      description << " by expected #{change}" if change
      description << ", actual change: #{actual}"
    else
      description = "#{expression} didn't change"
      description << " by expected #{change}" if change
      description << ", actual change: #{actual}"
    end

    satisfy(description) do |x|
      if change
        after == (before[index] + change)
      else
        before[index] != after
      end
    end
  end

  block_result
end

#not ⇒ Object 



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# File 'lib/peck/expectations.rb', line 41

def not
  @negated = !@negated
  self
end

#raise(exception_class = nil) ⇒ Object 



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# File 'lib/peck/expectations.rb', line 104

def raise(exception_class=nil)
  exception = nil
  begin
    @this.call
  rescue Exception => e
    exception = e
  end

  description = if exception_class
    if @negated
      "expected `#{exception_class}' to not be raised"
    else
      "expected `#{exception_class}' to be raised, but got a `#{exception.class}'"
    end
  else
    if @negated
      "expected nothing to be raised, but got `#{exception.inspect}'"
    else
      "expected an exception, but nothing was raised"
    end
  end

  satisfy(description) do
    if exception_class
      exception.kind_of?(exception_class)
    else
      !exception.nil?
    end
  end
end

#satisfy(*args, &block) ⇒ Object 



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# File 'lib/peck/expectations.rb', line 55

def satisfy(*args, &block)
  if args.size == 1 && String === args.first
    description = args.shift
  else
    description = ""
  end

  result = yield(@this, *args)
  unless @negated ^ result
    Kernel.raise Peck::Error.new(:failed, description)
  end
  result
end