TDD for Adjuster

Write failing test

Keep in mind; must do necessary stubs and set fixture data. The fixture data should be very much like read data.

Test Example 1

  it 'Should be able to take the `Hash` contaning srt data-structure' do
    # Stubbing File IO
    str_content = fixture_data
    allow(File).to receive(:read){str_content}
    
    inputs = Subjuster::UserInput.new(source: 'somefile')
    parsed_data = Subjuster::Parser.new(inputs: inputs).parse
    expect(Subjuster::Adjuster.new(data: parsed_data).data).to eq(parsed_data)
  end

Output

  NameError:
    uninitialized constant Subjuster::Adjuster
  # ./spec/adjuster_spec.rb:3:in `<top (required)>'

Now we approach to write code just to pass this example

  # lib/subjuster/adjuster.rb
  module Subjuster
    class Adjuster
    end
  end

We passed that error but still error prevails

  ArgumentError:
    wrong number of arguments (given 1, expected 0)
  # ./spec/adjuster_spec.rb:11:in `initialize'
  # ./spec/adjuster_spec.rb:11:in `new'
  # ./spec/adjuster_spec.rb:11:in `block (2 levels) in <top (required)>'

Lets try again,

  # lib/subjuster/adjuster.rb
  module Subjuster
    class Adjuster
      attr_reader :data
      def initialize(data:)
        @data = data
      end
    end
  end

HURRAH!

Now, it passes

Finished in 0.00596 seconds (files took 0.21119 seconds to load)
4 examples, 0 failures, 3 pending

Hunting for next Spec: Example 2

  describe 'adjust(no_of_seconds)' do
    it 'Should return the modified version of `Hash` supplied' do
      # Stubbing File IO
      str_content = fixture_data
      allow(File).to receive(:read){str_content}
      
      inputs = Subjuster::UserInput.new(source: 'somefile', adjustment_in_sec: 2)
      parsed_data = Subjuster::Parser.new(inputs: inputs).parse
      
      modified_data = Subjuster::Adjuster.new(data: parsed_data).run
      
      expect(modified_data.first[:start_time]).to eq('00:00:59,918')
      expect(modified_data.first[:end_time]).to   eq('00:01:04,514')
    end

Output

  NoMethodError:
    undefined method `run' for #<Subjuster::Adjuster:0x00557cba6c2988>
  # ./spec/adjuster_spec.rb:23:in `block (3 levels) in <top (required)>'

Now, we define run method

  attr_reader :data

  def initialize(data:)
    @data = data
  end

  def run
    data
  end

Output

  expected: "00:00:59,918"
       got: "00:00:57,918"

  (compared using ==)
  # ./spec/adjuster_spec.rb:25:in `block (3 levels) in <top (required)>'

Now, we try to solve the problem

Note:: Little improvement, def initialize(data:, inputs:) here inputs: has been added.

  module Subjuster
    class Adjuster
      attr_reader :data, :inputs
      
      def initialize(data:, inputs:)
        @data   = data
        @inputs = inputs
      end
      
      def run
        # new_data = data.clone
        data.map do |paragraph|
          paragraph[:start_time] = process_on(paragraph[:start_time])
          paragraph[:end_time]   = process_on(paragraph[:end_time])
          paragraph
        end
      end
      
      private
      
      # TODO: Refactoring needed
      def process_on(date)
        _, hrs, min, sec, milli =  /(..):(..):(..),(...)/.match(date).to_a.map(&:to_i)
        
        timestamp_in_msec = milli + sec*1000 + min*60000 + hrs*3600000 + inputs.adjustment_in_sec*1000
        rim = ""

        hr = timestamp_in_msec / 3600000
        rim << "%02i" % (hr.to_s) << ":" 
        
        min = timestamp_in_msec / 60000
        timestamp_in_msec -= min*60000
        rim << "%02i" % (min.to_s) << ":" 
        
        
        sec = timestamp_in_msec / 1000
        timestamp_in_msec -= sec*1000
        rim << "%02i" % (sec.to_s) << ":" 
        
        rim.slice!(-1)
        rim << "," << timestamp_in_msec.to_s
      end
    end
  end

HURRAH!

Now, it passes

Finished in 0.00675 seconds (files took 0.20251 seconds to load) 4 examples, 0 failures, 2 pending