Why assert fails?

Hi all,

While doing an exercism
(http://exercism.io/exercises/ruby/kindergarten-garden/readme)
I wrote the code below:

class Garden
STUDENTS = [:alice, :bob, :charlie, :david,
:eve, :fred, :ginny, :harriet,
:ileana, :joseph, :kincaid, :larry]

PLANTS = {“V” => :violets,
“C” => :clover,
“G” => :grass,
“R” => :radishes}

def initialize(diagram, students = STUDENTS)
students = students.map {|s| s.downcase.to_sym }.sort

row1, row2 = diagram
             .lines
             .map(&:chomp)
             .map(&:each_char)

row1, row2 = row1.each_slice(2), row2.each_slice(2)

row1.zip(row2).each_with_index do |plants, idx|
  self.class.send(:define_method,
                  students[idx],
                  -> { plants.flatten.map {|p| PLANTS[p] } })
end

end
end

This code passes all the tests except for this one

#!/usr/bin/env ruby
gem ‘minitest’, ‘>= 5.0.0’
require ‘minitest/autorun’
require_relative ‘kindergarten_garden’

class TwoGardensDifferentStudents < Minitest::Test
def diagram
“VCRRGVRG\nRVGCCGCV”
end

def garden_1
@garden_1 ||= Garden.new(diagram, %w(Alice Bob Charlie Dan))
end

def garden_2
@garden_2 ||= Garden.new(diagram, %w(Bob Charlie Dan Erin))
end

def test_bob_and_charlie_per_garden
assert_equal [:radishes, :radishes, :grass, :clover], garden_1.bob
assert_equal [:violets, :clover, :radishes, :violets], garden_2.bob
assert_equal [:grass, :violets, :clover, :grass], garden_1.charlie
assert_equal [:radishes, :radishes, :grass, :clover],
garden_2.charlie
end
end

And I can’t find the reason why. If asserts in
test_bob_and_charlie_per_garden are wrapped in a proper test method
each, then the test succeeds

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