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
|
require 'active_support/core_ext/string/strip' # for strip_heredoc
require 'concurrent/map'
module ActiveSupport
module Testing
class SimpleStubs # :nodoc:
Stub = Struct.new(:object, :method_name, :original_method)
def initialize
@stubs = Concurrent::Map.new { |h, k| h[k] = {} }
end
def stub_object(object, method_name, return_value)
if stub = stubbing(object, method_name)
unstub_object(stub)
end
new_name = "__simple_stub__#{method_name}"
@stubs[object.object_id][method_name] = Stub.new(object, method_name, new_name)
object.singleton_class.send :alias_method, new_name, method_name
object.define_singleton_method(method_name) { return_value }
end
def unstub_all!
@stubs.each_value do |object_stubs|
object_stubs.each_value do |stub|
unstub_object(stub)
end
end
@stubs.clear
end
def stubbing(object, method_name)
@stubs[object.object_id][method_name]
end
private
def unstub_object(stub)
singleton_class = stub.object.singleton_class
singleton_class.send :undef_method, stub.method_name
singleton_class.send :alias_method, stub.method_name, stub.original_method
singleton_class.send :undef_method, stub.original_method
end
end
# Contains helpers that help you test passage of time.
module TimeHelpers
# Changes current time to the time in the future or in the past by a given time difference by
# stubbing +Time.now+, +Date.today+, and +DateTime.now+.
#
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
# travel 1.day
# Time.current # => Sun, 10 Nov 2013 15:34:49 EST -05:00
# Date.current # => Sun, 10 Nov 2013
# DateTime.current # => Sun, 10 Nov 2013 15:34:49 -0500
#
# This method also accepts a block, which will return the current time back to its original
# state at the end of the block:
#
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
# travel 1.day do
# User.create.created_at # => Sun, 10 Nov 2013 15:34:49 EST -05:00
# end
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
def travel(duration, &block)
travel_to Time.now + duration, &block
end
# Changes current time to the given time by stubbing +Time.now+,
# +Date.today+, and +DateTime.now+ to return the time or date passed into this method.
#
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
# travel_to Time.zone.local(2004, 11, 24, 01, 04, 44)
# Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00
# Date.current # => Wed, 24 Nov 2004
# DateTime.current # => Wed, 24 Nov 2004 01:04:44 -0500
#
# Dates are taken as their timestamp at the beginning of the day in the
# application time zone. <tt>Time.current</tt> returns said timestamp,
# and <tt>Time.now</tt> its equivalent in the system time zone. Similarly,
# <tt>Date.current</tt> returns a date equal to the argument, and
# <tt>Date.today</tt> the date according to <tt>Time.now</tt>, which may
# be different. (Note that you rarely want to deal with <tt>Time.now</tt>,
# or <tt>Date.today</tt>, in order to honor the application time zone
# please always use <tt>Time.current</tt> and <tt>Date.current</tt>.)
#
# Note that the usec for the time passed will be set to 0 to prevent rounding
# errors with external services, like MySQL (which will round instead of floor,
# leading to off-by-one-second errors).
#
# This method also accepts a block, which will return the current time back to its original
# state at the end of the block:
#
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
# travel_to Time.zone.local(2004, 11, 24, 01, 04, 44) do
# Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00
# end
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
def travel_to(date_or_time)
if block_given? && simple_stubs.stubbing(Time, :now)
travel_to_nested_block_call = <<-MSG.strip_heredoc
Calling `travel_to` with a block, when we have previously already made a call to `travel_to`, can lead to confusing time stubbing.
Instead of:
travel_to 2.days.from_now do
# 2 days from today
travel_to 3.days.from_now do
# 5 days from today
end
end
preferred way to achieve above is:
travel 2.days do
# 2 days from today
end
travel 5.days do
# 5 days from today
end
MSG
raise travel_to_nested_block_call
end
if date_or_time.is_a?(Date) && !date_or_time.is_a?(DateTime)
now = date_or_time.midnight.to_time
else
now = date_or_time.to_time.change(usec: 0)
end
simple_stubs.stub_object(Time, :now, now)
simple_stubs.stub_object(Date, :today, now.to_date)
simple_stubs.stub_object(DateTime, :now, now.to_datetime)
if block_given?
begin
yield
ensure
travel_back
end
end
end
# Returns the current time back to its original state, by removing the stubs added by
# `travel` and `travel_to`.
#
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
# travel_to Time.zone.local(2004, 11, 24, 01, 04, 44)
# Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00
# travel_back
# Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00
def travel_back
simple_stubs.unstub_all!
end
private
def simple_stubs
@simple_stubs ||= SimpleStubs.new
end
end
end
end
|
