Created
May 30, 2013 15:39
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# Using Array#assoc instead of a Hash when comparing using only == | |
require 'test/unit/assertions' | |
include Test::Unit::Assertions | |
class Foo | |
def initialize(i) | |
@i = i | |
end | |
attr_reader :i | |
def ==(other) | |
@i == other.i | |
end | |
end | |
foo_1 = Foo.new(1) | |
foo_1b = Foo.new(1) | |
foo_2 = Foo.new(2) | |
assert_not_equal foo_1, foo_2 | |
assert_equal foo_1, foo_1b | |
# We can't use hash grouping ability because the class Foo does not properly | |
# implement #hash | |
i_counter = Hash.new(0) | |
[foo_1, foo_1b, foo_2].each do |foo| | |
i_counter[foo] += 1 | |
end | |
begin | |
assert_equal 2, i_counter[foo_1] | |
assert_equal 1, i_counter[foo_2] | |
rescue MiniTest::Assertion | |
p $! | |
end | |
# Array#assoc to the rescue :) | |
i_counter = [] | |
[foo_1, foo_1b, foo_2].each do |foo| | |
assoc = i_counter.assoc(foo) | |
if assoc | |
assoc[-1] += 1 | |
else | |
i_counter << [foo, 1] | |
end | |
end | |
assert_equal 2, i_counter.assoc(foo_1).last | |
assert_equal 1, i_counter.assoc(foo_2).last |
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