Add ExcelGenerator

lib/excel_generator.rb

@@ -0,0 +1,24 @@
+require 'rubyXL'
+
+class ExcelGenerator
+  attr_reader :worksheet
+
+  def initialize(image_handler)
+    @image_handler = image_handler
+    workbook = RubyXL::Workbook.new
+    @worksheet = workbook.worksheets[0]
+
+    add_cells
+  end
+
+  private
+
+  def add_cells
+    # creating necessary cells to display an image
+    @image_handler.width.times do |i|
+      @image_handler.height.times do |j|
+        @worksheet.add_cell(i, j, '')
+      end
+    end
+  end
+end

spec/lib/excel_generator_spec.rb

@@ -0,0 +1,18 @@
+require 'pathname'
+require './lib/excel_generator'
+require './lib/image_handler'
+
+require 'irb'
+
+RSpec.describe ExcelGenerator do
+  describe '#initialize' do
+    it 'initializes worksheet based on image width and height' do
+      image_path = Pathname.new('spec/fixtures/images/100_200.png')
+      image_handler = ImageHandler.new(image_path)
+      excel_generator = described_class.new(image_handler)
+      expect(excel_generator.worksheet[99][199]).to be_a(RubyXL::Cell)
+      expect(excel_generator.worksheet[99][200]).to eq(nil)
+      expect(excel_generator.worksheet[100]).to eq(nil)
+    end
+  end
+end