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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
Feature: `be` matchers
There are several related "be" matchers:
```ruby
expect(obj).to be_truthy # passes if obj is truthy (not nil or false)
expect(obj).to be_falsey # passes if obj is falsy (nil or false)
expect(obj).to be_nil # passes if obj is nil
expect(obj).to be # passes if obj is truthy (not nil or false)
```
Scenario: The `be_truthy` matcher
Given a file named "be_truthy_spec.rb" with:
"""ruby
RSpec.describe "be_truthy matcher" do
specify { expect(true).to be_truthy }
specify { expect(7).to be_truthy }
specify { expect("foo").to be_truthy }
specify { expect(nil).not_to be_truthy }
specify { expect(false).not_to be_truthy }
# deliberate failures
specify { expect(true).not_to be_truthy }
specify { expect(7).not_to be_truthy }
specify { expect("foo").not_to be_truthy }
specify { expect(nil).to be_truthy }
specify { expect(false).to be_truthy }
end
"""
When I run `rspec be_truthy_spec.rb`
Then the output should contain "10 examples, 5 failures"
And the output should contain:
"""
expected: falsey value
got: true
"""
And the output should contain:
"""
expected: falsey value
got: 7
"""
And the output should contain:
"""
expected: falsey value
got: "foo"
"""
And the output should contain:
"""
expected: truthy value
got: nil
"""
And the output should contain:
"""
expected: truthy value
got: false
"""
Scenario: The `be_falsey` matcher
Given a file named "be_falsey_spec.rb" with:
"""ruby
RSpec.describe "be_falsey matcher" do
specify { expect(nil).to be_falsey }
specify { expect(false).to be_falsey }
specify { expect(true).not_to be_falsey }
specify { expect(7).not_to be_falsey }
specify { expect("foo").not_to be_falsey }
# deliberate failures
specify { expect(nil).not_to be_falsey }
specify { expect(false).not_to be_falsey }
specify { expect(true).to be_falsey }
specify { expect(7).to be_falsey }
specify { expect("foo").to be_falsey }
end
"""
When I run `rspec be_falsey_spec.rb`
Then the output should contain "10 examples, 5 failures"
And the output should contain:
"""
expected: truthy value
got: nil
"""
And the output should contain:
"""
expected: truthy value
got: false
"""
And the output should contain:
"""
expected: falsey value
got: true
"""
And the output should contain:
"""
expected: falsey value
got: 7
"""
And the output should contain:
"""
expected: falsey value
got: "foo"
"""
Scenario: The `be_nil` matcher
Given a file named "be_nil_spec.rb" with:
"""ruby
RSpec.describe "be_nil matcher" do
specify { expect(nil).to be_nil }
specify { expect(false).not_to be_nil }
specify { expect(true).not_to be_nil }
specify { expect(7).not_to be_nil }
specify { expect("foo").not_to be_nil }
# deliberate failures
specify { expect(nil).not_to be_nil }
specify { expect(false).to be_nil }
specify { expect(true).to be_nil }
specify { expect(7).to be_nil }
specify { expect("foo").to be_nil }
end
"""
When I run `rspec be_nil_spec.rb`
Then the output should contain "10 examples, 5 failures"
And the output should contain:
"""
expected: not nil
got: nil
"""
And the output should contain:
"""
expected: nil
got: false
"""
And the output should contain:
"""
expected: nil
got: true
"""
And the output should contain:
"""
expected: nil
got: 7
"""
And the output should contain:
"""
expected: nil
got: "foo"
"""
Scenario: The `be` matcher
Given a file named "be_spec.rb" with:
"""ruby
RSpec.describe "be_matcher" do
specify { expect(true).to be }
specify { expect(7).to be }
specify { expect("foo").to be }
specify { expect(nil).not_to be }
specify { expect(false).not_to be }
# deliberate failures
specify { expect(true).not_to be }
specify { expect(7).not_to be }
specify { expect("foo").not_to be }
specify { expect(nil).to be }
specify { expect(false).to be }
end
"""
When I run `rspec be_spec.rb`
Then the output should contain all of these:
| 10 examples, 5 failures |
| expected true to evaluate to false |
| expected 7 to evaluate to false |
| expected "foo" to evaluate to false |
| expected nil to evaluate to true |
| expected false to evaluate to true |
|
