Module: Breaker::TestCases

Defined in:
lib/breaker/test_cases.rb

Constant Summary collapse

DummyError = 
Class.new RuntimeError

Instance Method Summary collapse

Instance Method Details

#repo ⇒ Object 



5
6
7
 
# File 'lib/breaker/test_cases.rb', line 5

def repo
  flunk "Test must define a repo to use"
end

#setup ⇒ Object 



9
10
11
 
# File 'lib/breaker/test_cases.rb', line 9

def setup
  Breaker.repo = repo
end

#test_breaker_query_methods ⇒ Object 



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
 
# File 'lib/breaker/test_cases.rb', line 168

def test_breaker_query_methods
  circuit = Breaker.circuit 'test'
  circuit.close

  assert Breaker.closed?('test')
  assert Breaker.up?('test')
  refute Breaker.open?('test')
  refute Breaker.down?('test')

  circuit.open

  assert Breaker.open?('test')
  assert Breaker.down?('test')
  refute Breaker.closed?('test')
  refute Breaker.up?('test')
end

#test_circuit_breaker_factory_can_run_code_through_the_circuit ⇒ Object 



160
161
162
163
164
165
166
 
# File 'lib/breaker/test_cases.rb', line 160

def test_circuit_breaker_factory_can_run_code_through_the_circuit
  assert_raises DummyError do
    Breaker.circuit 'test' do
      raise DummyError
    end
  end
end

#test_circuit_factory_creates_new_fuses_with_sensible_defaults ⇒ Object 



134
135
136
137
138
139
140
141
142
143
 
# File 'lib/breaker/test_cases.rb', line 134

def test_circuit_factory_creates_new_fuses_with_sensible_defaults
  circuit = Breaker.circuit 'test'

  assert_equal 1, Breaker.repo.count
  fuse = Breaker.repo.first

  assert_equal 10, fuse.failure_threshold, "Failure Theshold should have a default"
  assert_equal 60, fuse.retry_timeout, "Retry timeout should have a default"
  assert_equal 5, fuse.timeout, "Timeout should have a default"
end

#test_circuit_factory_persists_fuses ⇒ Object 



122
123
124
125
126
127
128
129
130
131
132
 
# File 'lib/breaker/test_cases.rb', line 122

def test_circuit_factory_persists_fuses
  circuit_a = Breaker.circuit 'test'
  circuit_b = Breaker.circuit 'test'

  assert_equal circuit_a, circuit_b, "Multiple calls to `circuit` should return the same circuit"

  assert_equal 1, Breaker.repo.count
  fuse = Breaker.repo.first

  assert_equal 'test', fuse.name
end

#test_circuit_factory_updates_existing_fuses ⇒ Object 



145
146
147
148
149
150
151
152
153
154
155
156
157
158
 
# File 'lib/breaker/test_cases.rb', line 145

def test_circuit_factory_updates_existing_fuses
  Breaker.circuit 'test'
  assert_equal 1, Breaker.repo.count

  Breaker.circuit 'test', failure_threshold: 1,
    retry_timeout: 2, timeout: 3

  assert_equal 1, Breaker.repo.count
  fuse = Breaker.repo.first

  assert_equal 1, fuse.failure_threshold
  assert_equal 2, fuse.retry_timeout
  assert_equal 3, fuse.timeout
end

#test_counts_timeouts_as_trips ⇒ Object 



111
112
113
114
115
116
117
118
119
120
 
# File 'lib/breaker/test_cases.rb', line 111

def test_counts_timeouts_as_trips
  circuit = Breaker.circuit 'test', retry_timeout: 15, timeout: 0.01
  assert circuit.closed?

  assert_raises TimeoutError do
    circuit.run do
      sleep circuit.timeout * 2
    end
  end
end

#test_failures_in_half_open_state_push_retry_timeout_back ⇒ Object 



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
 
# File 'lib/breaker/test_cases.rb', line 78

def test_failures_in_half_open_state_push_retry_timeout_back
  clock = Time.now
  circuit = Breaker.circuit 'test', failure_threshold: 1, retry_timeout: 15

  (circuit.failure_threshold + 1).times do
    begin
      circuit.run clock do
        raise DummyError
      end
    rescue DummyError ; end
  end

  assert circuit.open?

  assert_raises DummyError do
    circuit.run clock + circuit.retry_timeout do
      raise DummyError
    end
  end

  assert_raises Breaker::CircuitOpenError do
    circuit.run clock + circuit.retry_timeout do
      assert false, "Block should not be run while in this state"
    end
  end

  assert_raises DummyError do
    circuit.run clock + circuit.retry_timeout * 2 do
      raise DummyError
    end
  end
end

#test_goes_into_open_state_when_failure_threshold_reached ⇒ Object 



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
 
# File 'lib/breaker/test_cases.rb', line 20

def test_goes_into_open_state_when_failure_threshold_reached
  circuit = Breaker.circuit 'test', failure_threshold: 5, retry_timeout: 30

  assert circuit.closed?

  circuit.failure_threshold.times do
    begin
      circuit.run do
        raise DummyError
      end
    rescue DummyError ; end
  end

  assert_equal circuit.failure_count, circuit.failure_threshold
  refute circuit.open?

  assert_raises DummyError do
    circuit.run do
      raise DummyError
    end
  end

  assert circuit.open?

  assert_raises Breaker::CircuitOpenError do
    circuit.run do
      assert false, "Block should not run in this state"
    end
  end
end

#test_new_fuses_start_off_clean ⇒ Object 



13
14
15
16
17
18
 
# File 'lib/breaker/test_cases.rb', line 13

def test_new_fuses_start_off_clean
  circuit = Breaker.circuit 'test'

  assert circuit.closed?, "New circuits should be closed"
  assert_equal 0, circuit.failure_count
end

#test_success_in_half_open_state_moves_circuit_into_closed ⇒ Object 



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
 
# File 'lib/breaker/test_cases.rb', line 51

def test_success_in_half_open_state_moves_circuit_into_closed
  clock = Time.now
  circuit = Breaker.circuit 'test', failure_threshold: 2, retry_timeout: 15

  (circuit.failure_threshold + 1).times do
    begin
      circuit.run clock do
        raise DummyError
      end
    rescue DummyError ; end
  end

  assert circuit.open?

  assert_raises Breaker::CircuitOpenError do
    circuit.run clock do
      # nothing
    end
  end

  circuit.run clock + circuit.retry_timeout do
    # do nothing, this works and flips the circuit back closed
  end

  assert circuit.closed?
end