1#given a graph, output each level of friends.
 2#each friend should only be output once, at the first level they are encountered.
 3
 4=begin
 5INPUT
 62 # number of lines to follow
 7A:B,C,D # member a has friends b,c,d
 8A # the member to start the traversal from.
 9
10OUTPUT
11=end
12
13require 'social_graph'
14
15describe "problem" do
16  subject { SocialGraph.new(input, output) }
17  let(:output) { StringIO.new }
18
19  context "when 2 lines given" do 
20    let(:fixtures_dir) { File.join(Dir.pwd, 'spec', 'fixtures') }
21    let(:input) { StringIO.new(IO.read(File.join(fixtures_dir, "input001.txt"))) }
22    let(:expected) { IO.read(File.join(fixtures_dir, "output001.txt")) }
23
24    it 'writes the correct result' do
25      subject.run
26      output.rewind
27      expect(output.read).to eql(expected)
28    end
29  end
30
31  context "when 4 lines given" do
32    let(:fixtures_dir) { File.join(Dir.pwd, 'spec', 'fixtures') }
33    let(:input) { StringIO.new(IO.read(File.join(fixtures_dir, "input002.txt"))) }
34    let(:expected) { IO.read(File.join(fixtures_dir, "output002.txt")) }
35
36    it 'writes the correct result' do
37      subject.run
38      output.rewind
39      expect(output.read).to eql(expected)
40    end
41  end
42
43  context "when 7 lines given" do
44    let(:fixtures_dir) { File.join(Dir.pwd, 'spec', 'fixtures') }
45    let(:input) { StringIO.new(IO.read(File.join(fixtures_dir, "input000.txt"))) }
46    let(:expected) { IO.read(File.join(fixtures_dir, "output000.txt")) }
47
48    it 'writes the correct result' do
49      subject.run
50      output.rewind
51      expect(output.read).to eql(expected)
52    end
53  end
54end