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#TESTS require 'minitest' class IsDivisibleTest < MiniTest::Test def test_calculate_infected_percentage assert_equal 100 * 11.00 / 15.0 , calculate_infected_percentage('01000000X000X011X0X') assert_equal 100 * 8.00 / 11, calculate_infected_percentage('01X000X010X011XX') assert_equal 100.0, calculate_infected_percentage('000001XXXX0010X1X00010') assert_equal 100 * 6.00 / 14, calculate_infected_percentage('X00X000000X10X0100') end def test_no_peoples assert_equal 0, calculate_infected_percentage('XXXXX') end def test_none_infected assert_equal 0, calculate_infected_percentage('00000000X00X0000') end def no_islands assert_equal 100.0, calculate_infected_percentage('0000000010') end end #============CODE================== def calculate_infected_percentage(world='') return 0 if !world.include?('0') || !world.include?('1') continents = world.split('X') total_population = 0 infected = 0 continents.each do |continent| total_population += continent.length infected+= continent.length if continent.include?('1') end (infected * 100.00) / total_population end

> MiniTest.run Run options: --seed 34491 # Running: ... Finished in 0.002091s, 1434.6125 runs/s, 3347.4292 assertions/s. 4 runs, 7 assertions, 0 failures, 0 errors, 0 skips => true

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RUBY