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test_method.rb

 
module M

Simple data structure for what a test method contains.

Too lazy to make a class for this when it’s really just a bag of data without any behavior.

Includes the name of this method, what line on the file it begins on, and where it ends.

 
  class TestMethod < Struct.new(:name, :start_line, :end_line)

Set up a new test method for this test suite class

 
    def self.create(suite_class, test_method)

Hopefully it’s been defined as an instance method, so we’ll need to look up the ruby Method instance for it

 
      method = suite_class.instance_method(test_method)

Ruby can find the starting line for us, so pull that out of the array

 
      start_line = method.source_location.last

Ruby can’t find the end line however, and I’m too lazy to write a parser. Instead, method_source adds Method#source so we can deduce this ourselves.

The end line should be the number of line breaks in the method source, added to the starting line and subtracted by one.

 
      require "method_source"
      end_line = method.source.split("\n").size + start_line - 1

Shove the given attributes into a new databag

 
      new(test_method, start_line, end_line)
    end
  end
end