ruby-circular-buffer/circular_buffer_test.rb at master · simplonco/ruby-circular-buffer · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
#!/usr/bin/env ruby
gem 'minitest', '>= 5.0.0'
require 'minitest/autorun'
require_relative 'circular_buffer'

class CircularBufferTest < Minitest::Test
  def test_read_empty_buffer_throws_buffer_empty_exception
    buffer = CircularBuffer.new(1)
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end

  def test_write_and_read_back_one_item
    skip
    buffer = CircularBuffer.new(1)
    buffer.write '1'
    assert_equal '1', buffer.read
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end

  def test_write_and_read_back_multiple_items
    skip
    buffer = CircularBuffer.new(2)
    buffer.write '1'
    buffer.write '2'
    assert_equal '1', buffer.read
    assert_equal '2', buffer.read
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end

  def test_clearing_buffer
    skip
    buffer = CircularBuffer.new(3)
    ('1'..'3').each { |i| buffer.write i }
    buffer.clear
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
    buffer.write '1'
    buffer.write '2'
    assert_equal '1', buffer.read
    buffer.write '3'
    assert_equal '2', buffer.read
  end

  def test_alternate_write_and_read
    skip
    buffer = CircularBuffer.new(2)
    buffer.write '1'
    assert_equal '1', buffer.read
    buffer.write '2'
    assert_equal '2', buffer.read
  end

  def test_reads_back_oldest_item
    skip
    buffer = CircularBuffer.new(3)
    buffer.write '1'
    buffer.write '2'
    buffer.read
    buffer.write '3'
    assert_equal '2', buffer.read
    assert_equal '3', buffer.read
  end

  def test_writing_to_a_full_buffer_throws_an_exception
    skip
    buffer = CircularBuffer.new(2)
    buffer.write '1'
    buffer.write '2'
    assert_raises(CircularBuffer::BufferFullException) { buffer.write 'A' }
  end

  def test_overwriting_oldest_item_in_a_full_buffer
    skip
    buffer = CircularBuffer.new(2)
    buffer.write '1'
    buffer.write '2'
    buffer.write! 'A'
    assert_equal '2', buffer.read
    assert_equal 'A', buffer.read
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end

  def test_forced_writes_to_non_full_buffer_should_behave_like_writes
    skip
    buffer = CircularBuffer.new(2)
    buffer.write '1'
    buffer.write! '2'
    assert_equal '1', buffer.read
    assert_equal '2', buffer.read
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end

  # rubocop:disable Metrics/MethodLength
  def test_alternate_read_and_write_into_buffer_overflow
    skip
    buffer = CircularBuffer.new(5)
    ('1'..'3').each { |i| buffer.write i }
    buffer.read
    buffer.read
    buffer.write '4'
    buffer.read
    ('5'..'8').each { |i| buffer.write i }
    buffer.write! 'A'
    buffer.write! 'B'
    ('6'..'8').each do |i|
      assert_equal i, buffer.read
    end
    assert_equal 'A', buffer.read
    assert_equal 'B', buffer.read
    assert_raises(CircularBuffer::BufferEmptyException) { buffer.read }
  end
  # rubocop:enable Metrics/MethodLength
end