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74 lines
2.6 KiB
74 lines
2.6 KiB
require 'ruby_intro.rb'
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describe 'Ruby intro part 1' do
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describe "#sum" do
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it "should be defined" do
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expect { sum([1,3,4]) }.not_to raise_error
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end
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it "returns correct sum [20 points]" , points: 20 do
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expect(sum([1,2,3,4,5])).to be_a_kind_of Fixnum
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expect(sum([1,2,3,4,5])).to eq(15)
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expect(sum([1,2,3,4,-5])).to eq(5)
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expect(sum([1,2,3,4,-5,5,-100])).to eq(-90)
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end
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it "works on the empty array [10 points]" , points: 10 do
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expect { sum([]) }.not_to raise_error
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expect(sum([])).to be_zero
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end
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end
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describe "#max_2_sum" do
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it "should be defined" do
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expect { max_2_sum([1,2,3]) }.not_to raise_error
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end
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it "returns the correct sum [7 points]" , points: 7 do
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expect(max_2_sum([1,2,3,4,5])).to be_a_kind_of Fixnum
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expect(max_2_sum([1,-2,-3,-4,-5])).to eq(-1)
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end
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it 'works even if 2 largest values are the same [3 points]' , points: 3 do
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expect(max_2_sum([1,2,3,3])).to eq(6)
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end
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it "returns zero if array is empty [10 points]" , points: 10 do
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expect(max_2_sum([])).to be_zero
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end
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it "returns value of the element if just one element [10 points]" , points: 10 do
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expect(max_2_sum([3])).to eq(3)
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end
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end
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describe "#sum_to_n" do
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it "should be defined" do
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expect { sum_to_n?([1,2,3],4) }.not_to raise_error
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end
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it "returns true when any two elements sum to the second argument [30 points]" , points: 30 do
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expect(sum_to_n?([1,2,3,4,5], 5)).to be true # 2 + 3 = 5
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expect(sum_to_n?([3,0,5], 5)).to be true # 0 + 5 = 5
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expect(sum_to_n?([-1,-2,3,4,5,-8], -3)).to be true # handles negative sum
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expect(sum_to_n?([-1,-2,3,4,5,-8], 12)).to be false # 3 + 4 + 5 = 12 (not 3 elements)
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expect(sum_to_n?([-1,-2,3,4,6,-8], 12)).to be false # no two elements that sum
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end
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# for rspec 2.14.1
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# it "returns false for the single element array [5 points]" , points: 5 do
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# sum_to_n?([1], 1).should be_false
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# sum_to_n?([3], 0).should be_false
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# end
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# it "returns false for the empty array [5 points]" , points: 5 do
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# sum_to_n?([], 0).should be_false
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# sum_to_n?([], 7).should be_false
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# end
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it "returns false for any single element array [5 points]" , points: 5 do
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expect(sum_to_n?([0], 0)).to be false
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expect(sum_to_n?([1], 1)).to be false
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expect(sum_to_n?([-1], -1)).to be false
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expect(sum_to_n?([-3], 0)).to be false
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end
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it "returns false for an empty array [5 points]" , points: 5 do
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expect(sum_to_n?([], 0)).to be false
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expect(sum_to_n?([], 7)).to be false
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end
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end
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end
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