Class: ButterflyNet::TestUnitMethod

Inherits:
Object
  • Object
show all
Defined in:
lib/butterfly_net/test_unit_method.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TestUnitMethod

Returns a new instance of TestUnitMethod.



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# File 'lib/butterfly_net/test_unit_method.rb', line 4

def initialize
  @lines = []
end

Class Method Details

.assertion(expected, line) ⇒ Object

todo: extract to assertion class



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# File 'lib/butterfly_net/test_unit_method.rb', line 16

def self.assertion(expected, line)     # todo: extract to assertion class
  if expected && simple_assignment_only?(line)
    line
  elsif expected && expected == line # type not supported, assume object inequality
    "assert_not_equal((#{expected}), #{line})"
  elsif expected == "true" # use simple assert() for true boolean expressions
    "assert(#{line})"
  elsif expected
    "assert_equal(#{expected}, #{line})"
  else
    nil
  end
end

.simple_assignment_only?(line) ⇒ Boolean

todo: extract to line class

Returns:

  • (Boolean) 


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# File 'lib/butterfly_net/test_unit_method.rb', line 12

def self.simple_assignment_only?(line)  # todo: extract to line class
  line =~ /[^=<>!*%\/+-\\|&]=[^=~]/
end

Instance Method Details

#<<(line) ⇒ Object 



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# File 'lib/butterfly_net/test_unit_method.rb', line 8

def <<(line)
  @lines << line
end

#expected_assertion(current_i) ⇒ Object 



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# File 'lib/butterfly_net/test_unit_method.rb', line 43

def expected_assertion(current_i)

  current_line = @lines[current_i]
  commands = current_line
  start_i = current_i

  begin
    retval = eval commands
  rescue
    start_i -= 1
    commands = @lines[start_i..current_i].join("\n")

    if start_i < 0
      puts "failure evaluating: eval[#{start_i}..#{current_i}] : #{commands}\n"
      return nil
    else
      retry
    end
  end
  if retval && TestUnitMethod.simple_assignment_only?(current_line)
    current_line

  elsif instances_equal_by_value?(retval) # expression result supports value equality

    if retval == true # use simple assert() for true boolean expressions
      "assert(#{current_line})"
    elsif retval.nil?
      "assert_nil(#{current_line})"
    else
      "assert_equal(#{retval.inspect}, #{current_line})"
    end

  else

    # any other sort of object is handled as a not equal assertion
    "assert_not_equal((#{current_line}), #{current_line})"
  end

end

#instances_equal_by_value?(instance) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/butterfly_net/test_unit_method.rb', line 83

def instances_equal_by_value?(instance)
  instance == instance.dup rescue true  # can't dup Fixnum, et al...
end

#text(method_name) ⇒ Object 



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# File 'lib/butterfly_net/test_unit_method.rb', line 34

def text(method_name)
  method_string = "def test_#{method_name}\n"
  @lines.each_with_index do |line, i|
    text = text_from_expression(line, i)
    method_string += "    #{text}\n" if text
  end
  method_string += "  end"
end

#text_from_expression(line, i) ⇒ Object 



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# File 'lib/butterfly_net/test_unit_method.rb', line 30

def text_from_expression(line, i)
  expected_assertion(i)
end