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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/module/delegation'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/kernel/reporting'
require 'rails/generators'
require 'fileutils'
module Rails
module Generators
# Disable color in output. Easier to debug.
no_color!
# This class provides a TestCase for testing generators. To setup, you need
# just to configure the destination and set which generator is being tested:
#
# class AppGeneratorTest < Rails::Generators::TestCase
# tests AppGenerator
# destination File.expand_path("../tmp", File.dirname(__FILE__))
# end
#
# If you want to ensure your destination root is clean before running each test,
# you can set a setup callback:
#
# class AppGeneratorTest < Rails::Generators::TestCase
# tests AppGenerator
# destination File.expand_path("../tmp", File.dirname(__FILE__))
# setup :prepare_destination
# end
class TestCase < ActiveSupport::TestCase
include FileUtils
class_attribute :destination_root, :current_path, :generator_class, :default_arguments
# Generators frequently change the current path using +FileUtils.cd+.
# So we need to store the path at file load and revert back to it after each test.
self.current_path = File.expand_path(Dir.pwd)
self.default_arguments = []
def setup # :nodoc:
destination_root_is_set?
ensure_current_path
super
end
def teardown # :nodoc:
ensure_current_path
super
end
# Sets which generator should be tested:
#
# tests AppGenerator
def self.tests(klass)
self.generator_class = klass
end
# Sets default arguments on generator invocation. This can be overwritten when
# invoking it.
#
# arguments %w(app_name --skip-active-record)
def self.arguments(array)
self.default_arguments = array
end
# Sets the destination of generator files:
#
# destination File.expand_path("../tmp", File.dirname(__FILE__))
def self.destination(path)
self.destination_root = path
end
# Asserts a given file exists. You need to supply an absolute path or a path relative
# to the configured destination:
#
# assert_file "config/environment.rb"
#
# You can also give extra arguments. If the argument is a regexp, it will check if the
# regular expression matches the given file content. If it's a string, it compares the
# file with the given string:
#
# assert_file "config/environment.rb", /initialize/
#
# Finally, when a block is given, it yields the file content:
#
# assert_file "app/controllers/products_controller.rb" do |controller|
# assert_instance_method :index, controller do |index|
# assert_match(/Product\.all/, index)
# end
# end
def assert_file(relative, *contents)
absolute = File.expand_path(relative, destination_root)
assert File.exists?(absolute), "Expected file #{relative.inspect} to exist, but does not"
read = File.read(absolute) if block_given? || !contents.empty?
yield read if block_given?
contents.each do |content|
case content
when String
assert_equal content, read
when Regexp
assert_match content, read
end
end
end
alias :assert_directory :assert_file
# Asserts a given file does not exist. You need to supply an absolute path or a
# path relative to the configured destination:
#
# assert_no_file "config/random.rb"
def assert_no_file(relative)
absolute = File.expand_path(relative, destination_root)
assert !File.exists?(absolute), "Expected file #{relative.inspect} to not exist, but does"
end
alias :assert_no_directory :assert_no_file
# Asserts a given migration exists. You need to supply an absolute path or a
# path relative to the configured destination:
#
# assert_migration "db/migrate/create_products.rb"
#
# This method manipulates the given path and tries to find any migration which
# matches the migration name. For example, the call above is converted to:
#
# assert_file "db/migrate/003_create_products.rb"
#
# Consequently, assert_migration accepts the same arguments has assert_file.
def assert_migration(relative, *contents, &block)
file_name = migration_file_name(relative)
assert file_name, "Expected migration #{relative} to exist, but was not found"
assert_file file_name, *contents, &block
end
# Asserts a given migration does not exist. You need to supply an absolute path or a
# path relative to the configured destination:
#
# assert_no_migration "db/migrate/create_products.rb"
def assert_no_migration(relative)
file_name = migration_file_name(relative)
assert_nil file_name, "Expected migration #{relative} to not exist, but found #{file_name}"
end
# Asserts the given class method exists in the given content. This method does not detect
# class methods inside (class << self), only class methods which starts with "self.".
# When a block is given, it yields the content of the method.
#
# assert_migration "db/migrate/create_products.rb" do |migration|
# assert_class_method :up, migration do |up|
# assert_match(/create_table/, up)
# end
# end
def assert_class_method(method, content, &block)
assert_instance_method "self.#{method}", content, &block
end
# Asserts the given method exists in the given content. When a block is given,
# it yields the content of the method.
#
# assert_file "app/controllers/products_controller.rb" do |controller|
# assert_instance_method :index, controller do |index|
# assert_match(/Product\.all/, index)
# end
# end
def assert_instance_method(method, content)
assert content =~ /def #{method}(\(.+\))?(.*?)\n\s+end/m, "Expected to have method #{method}"
yield $2.strip if block_given?
end
alias :assert_method :assert_instance_method
# Asserts the given attribute type gets translated to a field type
# properly:
#
# assert_field_type :date, :date_select
def assert_field_type(attribute_type, field_type)
assert_equal(field_type, create_generated_attribute(attribute_type).field_type)
end
# Asserts the given attribute type gets a proper default value:
#
# assert_field_default_value :string, "MyString"
def assert_field_default_value(attribute_type, value)
assert_equal(value, create_generated_attribute(attribute_type).default)
end
# Runs the generator configured for this class. The first argument is an array like
# command line arguments:
#
# class AppGeneratorTest < Rails::Generators::TestCase
# tests AppGenerator
# destination File.expand_path("../tmp", File.dirname(__FILE__))
# teardown :cleanup_destination_root
#
# test "database.yml is not created when skipping Active Record" do
# run_generator %w(myapp --skip-active-record)
# assert_no_file "config/database.yml"
# end
# end
#
# You can provide a configuration hash as second argument. This method returns the output
# printed by the generator.
def run_generator(args=self.default_arguments, config={})
capture(:stdout) { self.generator_class.start(args, config.reverse_merge(destination_root: destination_root)) }
end
# Instantiate the generator.
def generator(args=self.default_arguments, options={}, config={})
@generator ||= self.generator_class.new(args, options, config.reverse_merge(destination_root: destination_root))
end
# Create a Rails::Generators::GeneratedAttribute by supplying the
# attribute type and, optionally, the attribute name:
#
# create_generated_attribute(:string, 'name')
def create_generated_attribute(attribute_type, name = 'test', index = nil)
Rails::Generators::GeneratedAttribute.parse([name, attribute_type, index].compact.join(':'))
end
protected
def destination_root_is_set? # :nodoc:
raise "You need to configure your Rails::Generators::TestCase destination root." unless destination_root
end
def ensure_current_path # :nodoc:
cd current_path
end
def prepare_destination # :nodoc:
rm_rf(destination_root)
mkdir_p(destination_root)
end
def migration_file_name(relative) # :nodoc:
absolute = File.expand_path(relative, destination_root)
dirname, file_name = File.dirname(absolute), File.basename(absolute).sub(/\.rb$/, '')
Dir.glob("#{dirname}/[0-9]*_*.rb").grep(/\d+_#{file_name}.rb$/).first
end
end
end
end
|