feat: enhance DataListStudentShort with data preparation methods and add unit tests

lab2/data_list_student_short.rb

@@ -1,21 +1,54 @@
-require_relative 'data_table'
+require_relative './data_table'
 
 class DataListStudentShort < DataList
+  def initialize(items)
+    super(items.select { |item| item.is_a?(StudentShort) })
+  end
+
   def get_names
-    ['№', 'Фамилия и инициалы', 'Телефон', 'Telegram', 'Email']
+    column_names
   end
 
   def get_data
-    data = @items.each_with_index.map do |student, index|
-      [
-        index + 1,                          # id
-        student.surname_initials,           # Фамилия и инициалы
-        student.phone || '-',               # Телефон (или прочерк)
-        student.telegram || '-',            # Telegram (или прочерк)
-        student.email || '-'                # Email (или прочерк)
-      ]
+    data = prepare_table_data
+    DataTable.new(data)
+  end
+
+  private
+
+  def column_names
+    ['№', 'Фамилия и инициалы', 'Телефон', 'Telegram', 'Email']
+  end
+
+  def prepare_table_data
+    @items.each_with_index.map do |item, index|
+      prepare_row(item, index)
     end
+  end
 
-    DataTable.new(data)
+  def prepare_row(item, index)
+    [
+      index + 1,                       # id
+      item.surname_initials,           # Фамилия и инициалы
+      item.phone || '-',               # Телефон (или прочерк)
+      item.telegram || '-',            # Telegram (или прочерк)
+      item.email || '-'                # Email (или прочерк)
+    ]
+  end
+
+  def extract_surname_initials(item)
+    item.respond_to?(:surname_initials) ? item.surname_initials : 'N/A'
+  end
+
+  def extract_phone(item)
+    item.respond_to?(:phone) ? item.phone : nil
+  end
+
+  def extract_telegram(item)
+    item.respond_to?(:telegram) ? item.telegram : nil
+  end
+
+  def extract_email(item)
+    item.respond_to?(:email) ? item.email : nil
   end
 end

lab2/tests/test_data_list_student_short.rb

@@ -0,0 +1,54 @@
+require 'minitest/autorun'
+require_relative '../data_list_student_short'
+require_relative '../student_short'
+
+class TestDataListStudentShort < Minitest::Test
+  def setup
+    @students = [
+      StudentShort.new(id: '1', surname_initials: 'Иванов И.И.', phone: '+79991112233'),
+      StudentShort.new(id: '2', surname_initials: 'Петров П.П.', telegram: '@petrov'),
+      StudentShort.new(id: '3', surname_initials: 'Сидоров С.С.', email: 'sidorov@mail.ru')
+    ]
+    @data_list = DataListStudentShort.new(@students)
+  end
+
+  def test_get_names
+    assert_equal ['№', 'Фамилия и инициалы', 'Телефон', 'Telegram', 'Email'], 
+                 @data_list.get_names
+  end
+
+  def test_get_data
+    table = @data_list.get_data
+    
+    assert_equal 3, table.rows_count
+    assert_equal 5, table.columns_count
+    
+    assert_equal 1, table.item(0, 0)
+    assert_equal 'Иванов И.И.', table.item(0, 1)
+    assert_equal '+79991112233', table.item(0, 2)
+    assert_equal '-', table.item(0, 3)
+    assert_equal '-', table.item(0, 4)
+    
+    assert_equal '-', table.item(1, 2)
+    assert_equal '@petrov', table.item(1, 3)
+  end
+
+  def test_selection_functionality
+    @data_list.select(0)
+    @data_list.select(2)
+    assert_equal [0, 2], @data_list.get_selected
+  end
+
+  def test_invalid_data_handling
+    invalid_students = [
+      { id: '1', name: 'Иванов И.И.', phone: '+79991112233' },
+      StudentShort.new(id: '2', surname_initials: 'Петров П.П.', telegram: '@petrov')
+    ]
+    data_list = DataListStudentShort.new(invalid_students)
+    
+    table = data_list.get_data
+    
+    assert_equal 'N/A', table.item(0, 1)
+    assert_equal '-', table.item(0, 3)
+  end
+end