我用ruby（不是rails）编写了一些简单的方法，并使用常规的rspec测试了它们。它们全都通过我的系统，但是其中两个在自动分级机中失败，如果我在cloud9上运行它们，它们也会失败。这个怎么可能？我已经在Windows上搜索了rspec的任何特殊问题，但至少从3.2版开始就没有了。（我使用的是3.8）
这是我的IDE中的输出：
$ rspec
Ruby intro part 1
#sum
should be defined
returns correct sum [20 points]
works on the empty array [10 points]
#max_2_sum
should be defined
returns the correct sum [7 points]
works even if 2 largest values are the same [3 points]
returns zero if array is empty [10 points]
returns value of the element if just one element [10 points]
#sum_to_n
should be defined
returns true when any two elements sum to the second argument [30 points]
returns false for any single element array [5 points]
returns false for an empty array [5 points]
#hello
should be defined
The hello method returns the correct string [30 points]
#starts_with_consonant?
should be defined
classifies true cases [10 points]
classifies false cases [10 points]
works on the empty string [5 points]
works on nonletters [5 points]
#binary_multiple_of_4?
should be defined
classifies valid binary numbers [30 points]
rejects invalid binary numbers [10 points]
BookInStock
should be defined
getters and setters
should set ISBN [10 points]
should set price [10 points]
should be able to change ISBN [10 points]
should be able to change price [10 points]
constructor
should reject invalid ISBN number [10 points]
should reject zero price [10 points]
should reject negative price [10 points]
#price_as_string
should be defined
should display 33.95 as "$33.95" [10 points]
should display 1.1 as $1.10 [10 points]
should display 20 as $20.00 [10 points]
Finished in 0.03195 seconds (files took 0.30126 seconds to load)
34 examples, 0 failures
现在是平地机...
Ruby intro part 1
#sum
should be defined
returns correct sum [20 points]
works on the empty array [10 points]
#max_2_sum
should be defined (FAILED - 1)
returns the correct sum [7 points] (FAILED - 2)
works even if 2 largest values are the same [3 points] (FAILED - 3)
returns zero if array is empty [10 points] (FAILED - 4)
returns value of the element if just one element [10 points] (FAILED - 5)
#sum_to_n
should be defined
returns true when any two elements sum to the second argument [30 points]
returns false for the single element array [5 points]
returns false for the empty array [5 points]
Failures:
1) Ruby intro part 1 #max_2_sum should be defined
Failure/Error: expect { max_2_sum([1,2,3]) }.not_to raise_error
expected no Exception, got # with backtrace:
2) Ruby intro part 1 #max_2_sum returns the correct sum [7 points]
Failure/Error: raise 'NonInteger' if arr.all?(Integer) == false
ArgumentError:
wrong number of arguments (1 for 0)
3) Ruby intro part 1 #max_2_sum works even if 2 largest values are the same [3 points]
Failure/Error: raise 'NonInteger' if arr.all?(Integer) == false
ArgumentError:
wrong number of arguments (1 for 0)
4) Ruby intro part 1 #max_2_sum returns zero if array is empty [10 points]
Failure/Error: raise 'NonInteger' if arr.all?(Integer) == false
ArgumentError:
wrong number of arguments (1 for 0)
5) Ruby intro part 1 #max_2_sum returns value of the element if just one element [10 points]
Failure/Error: raise 'NonInteger' if arr.all?(Integer) == false
ArgumentError:
wrong number of arguments (1 for 0)
Finished in 0.01805 seconds (files took 11744 minutes 10 seconds to load)
12 examples, 5 failures
Failed examples:
rspec your_code.rb:157 # Ruby intro part 1 #max_2_sum should be defined
rspec your_code.rb:160 # Ruby intro part 1 #max_2_sum returns the correct sum [7 points]
rspec your_code.rb:164 # Ruby intro part 1 #max_2_sum works even if 2 largest values are the same [3 points]
rspec your_code.rb:167 # Ruby intro part 1 #max_2_sum returns zero if array is empty [10 points]
rspec your_code.rb:170 # Ruby intro part 1 #max_2_sum returns value of the element if just one element [10 points]
BookInStock
should be defined
getters and setters
should set ISBN [10 points]
should set price [10 points]
should be able to change ISBN [10 points]
should be able to change price [10 points]
constructor
should reject invalid ISBN number [10 points]
should reject zero price [10 points]
should reject negative price [10 points]
#price_as_string
should be defined
should display 33.95 as "$33.95" [10 points]
should display 1.1 as $1.10 [10 points]
should display 20 as $20.00 [10 points]
Finished in 0.00328 seconds (files took 11744 minutes 10 seconds to load)
12 examples, 0 failures
#hello
should be defined
The hello method returns the correct string [30 points]
#starts_with_consonant?
should be defined
classifies true cases [10 points]
classifies false cases [10 points]
works on the empty string [5 points]
works on nonletters [5 points]
#binary_multiple_of_4?
should be defined (FAILED - 1)
classifies valid binary numbers [30 points] (FAILED - 2)
rejects invalid binary numbers [10 points] (FAILED - 3)
Failures:
1) #binary_multiple_of_4? should be defined
Failure/Error: expect { binary_multiple_of_4?("yes") }.not_to raise_error()#::NoMethodError)
expected no Exception, got # with backtrace:
2) #binary_multiple_of_4? classifies valid binary numbers [30 points]
Failure/Error: return false unless s.chars.all?(/[01]/) #
ArgumentError:
wrong number of arguments (1 for 0)
3) #binary_multiple_of_4? rejects invalid binary numbers [10 points]
Failure/Error: return false unless s.chars.all?(/[01]/) #
ArgumentError:
wrong number of arguments (1 for 0)
Finished in 0.00239 seconds (files took 11744 minutes 10 seconds to load)
10 examples, 3 failures
Failed examples:
rspec your_code.rb:175 # #binary_multiple_of_4? should be defined
rspec your_code.rb:178 # #binary_multiple_of_4? classifies valid binary numbers [30 points]
rspec your_code.rb:186 # #binary_multiple_of_4? rejects invalid binary numbers [10 points]
编辑：
以下是通过/失败的方法：
def max_2_sum(arr)
# takes an array of integers as an argument and returns the sum of its two largest elements.
# For an empty array it should return zero. For an array with just one element, it should return that element.
raise 'NonInteger' if arr.all?(Integer) == false
return 0 if arr.empty?
return arr[0] if arr.length == 1
return sum(arr) if arr.length == 2
arr.sort!
sum(arr[-2..-1])
end
def binary_multiple_of_4?(s)
if s.length == 1
return true if s == '0'
return false if s == '1'
else
return false unless s.chars.all?(/[01]/)
s[-1] == '0' && s[-2] == '0'
end
end
以下是测试：
describe '#max_2_sum' do
it 'should be defined' do
expect { max_2_sum([1, 2, 3]) }.not_to raise_error
end
it 'returns the correct sum [7 points]', points: 7 do
expect(max_2_sum([1, 2, 3, 4, 5])).to be_a_kind_of Integer
expect(max_2_sum([1, -2, -3, -4, -5])).to eq(-1)
end
it 'works even if 2 largest values are the same [3 points]', points: 3 do
expect(max_2_sum([1, 2, 3, 3])).to eq(6)
end
it 'returns zero if array is empty [10 points]', points: 10 do
expect(max_2_sum([])).to be_zero
end
it 'returns value of the element if just one element [10 points]', points: 10 do
expect(max_2_sum([3])).to eq(3)
end
end
describe '#binary_multiple_of_4?' do
it 'should be defined' do
expect { binary_multiple_of_4?('yes') }.not_to raise_error#::NoMethodError)
end
it 'classifies valid binary numbers [30 points]' , points: 30 do
%w[1010101010100 0101010101010100 100 0].each do |string|
expect(binary_multiple_of_4?(string)).to be_truthy, "Incorrect results for input: \"#{string}\""
end
%w[101 1000000000001].each do |string|
expect(binary_multiple_of_4?(string)).not_to be_truthy, "Incorrect results for input: \"#{string}\""
end
end
it 'rejects invalid binary numbers [10 points]' , points: 10 do
expect(binary_multiple_of_4?('a100')).to be_falsy, "'a100' is not a valid binary number!"
expect(binary_multiple_of_4?('')).to be_falsy, 'The empty string is not a valid binary number!'
end
end
为什么在某些环境中s.chars.all?(/[01]/)和arr.all?(Integer)会导致ArgumentError而不在其他环境中导致ArgumentError？该文档没有给出任何答案。更重要的是，我该如何解决？
答案 0 :(得分：0)
参数签名
arr.all?(Integer)
arr.all?(/[01]/)
仅在Ruby 2.5中受支持。您可以看到讨论该博客文章
https://blog.bigbinary.com/2018/01/02/ruby-2-5-enumerable-predicates-accept-pattern-argument.html
在旧版Ruby中，您必须将一个块传递给all?，例如：
arr.all? { |el| el.is_a?(Integer) }
arr.all? { |el| el =~ /[01]/ }
从您的评论看来，您的本地Ruby环境和Cloud 9正在运行不同的版本。