aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_controller/assertions.rb
blob: b29a2864a7013433bb21371a94c63deadfe8950c (plain) (blame)
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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
require 'test/unit'
require 'test/unit/assertions'
require 'rexml/document'
require "#{File.dirname(__FILE__)}/vendor/html-scanner/html/document"

module Test #:nodoc:
  module Unit #:nodoc:
    # In addition to these specific assertions, you also have easy access to various collections that the regular test/unit assertions
    # can be used against. These collections are:
    #
    # * assigns: Instance variables assigned in the action that's available for the view.
    # * session: Objects being saved in the session.
    # * flash: The flash objects being currently in the session.
    # * cookies: Cookies being sent to the user on this request.
    # 
    # These collections can be used just like any other hash:
    #
    #   assert_not_nil assigns(:person) # makes sure that a @person instance variable was set
    #   assert_equal "Dave", cookies[:name] # makes sure that a cookie called :name was set as "Dave"
    #   assert flash.empty? # makes sure that there's nothing in the flash
    #
    # For historic reasons, the assigns hash uses string-based keys. So assigns[:person] won't work, but assigns["person"] will. To
    # appease our yearning for symbols, though, an alternative accessor has been deviced using a method call instead of index referencing.
    # So assigns(:person) will work just like assigns["person"], but again, assigns[:person] will not work.
    #
    # On top of the collections, you have the complete url that a given action redirected to available in redirect_to_url.
    #
    # For redirects within the same controller, you can even call follow_redirect and the redirect will be follow triggering another
    # action call which can then be asserted against.
    #
    # == Manipulating the request collections
    #
    # The collections described above link to the response, so you can test if what the actions were expected to do happen. But
    # some times you also want to manipulate these collections in the request coming in. This is really only relevant for sessions
    # and cookies, though. For sessions, you just do:
    #
    #   @request.session[:key] = "value"
    #
    # For cookies, you need to manually create the cookie, like this:
    #
    #   @request.cookies["key"] = CGI::Cookie.new("key", "value")
    #
    # == Testing named routes
    #
    # If you're using named routes, they can be easily tested using the original named routes methods straight in the test case.
    # Example: 
    #
    #  assert_redirected_to page_url(:title => 'foo')
    module Assertions
      # Asserts that the response is one of the following types:
      # 
      # * <tt>:success</tt>: Status code was 200
      # * <tt>:redirect</tt>: Status code was in the 300-399 range
      # * <tt>:missing</tt>: Status code was 404
      # * <tt>:error</tt>:  Status code was in the 500-599 range
      #
      # You can also pass an explicit status code number as the type, like assert_response(501)
      def assert_response(type, message = nil)
        clean_backtrace do
          if [ :success, :missing, :redirect, :error ].include?(type) && @response.send("#{type}?")
            assert_block("") { true } # to count the assertion
          elsif type.is_a?(Fixnum) && @response.response_code == type
            assert_block("") { true } # to count the assertion
          else
            assert_block(build_message(message, "Expected response to be a <?>, but was <?>", type, @response.response_code)) { false }
          end               
        end
      end

      # Assert that the redirection options passed in match those of the redirect called in the latest action. This match can be partial,
      # such at assert_redirected_to(:controller => "weblog") will also match the redirection of 
      # redirect_to(:controller => "weblog", :action => "show") and so on.
      def assert_redirected_to(options = {}, message=nil)
        clean_backtrace do
          assert_response(:redirect, message)

          if options.is_a?(String)
            msg = build_message(message, "expected a redirect to <?>, found one to <?>", options, @response.redirect_url)
            url_regexp = %r{^(\w+://.*?(/|$|\?))(.*)$}
            eurl, epath, url, path = [options, @response.redirect_url].collect do |url|
              u, p = (url_regexp =~ url) ? [$1, $3] : [nil, url]
              [u, (p[0..0] == '/') ? p : '/' + p]
            end.flatten

            assert_equal(eurl, url, msg) if eurl && url
            assert_equal(epath, path, msg) if epath && path 
          else
            msg = build_message(message, "response is not a redirection to all of the options supplied (redirection is <?>)",
                                @response.redirected_to || @response.redirect_url)

            assert_block(msg) do
              if options.is_a?(Symbol)
                @response.redirected_to == options
              else
                options.keys.all? do |k|
                  if k == :controller then options[k] == ActionController::Routing.controller_relative_to(@response.redirected_to[k], @controller.class.controller_path)
                  else options[k] == (@response.redirected_to[k].respond_to?(:to_param) ? @response.redirected_to[k].to_param : @response.redirected_to[k] unless @response.redirected_to[k].nil?)
                  end
                end
              end
            end
          end
        end
      end

      # Asserts that the request was rendered with the appropriate template file.
      def assert_template(expected = nil, message=nil)
        clean_backtrace do
          rendered = expected ? @response.rendered_file(!expected.include?('/')) : @response.rendered_file
          msg = build_message(message, "expecting <?> but rendering with <?>", expected, rendered)
          assert_block(msg) do
            if expected.nil?
              !@response.rendered_with_file?
            else
              expected == rendered
            end
          end               
        end
      end

      # Asserts that the routing of the given path is handled correctly and that the parsed options match.
      def assert_recognizes(expected_options, path, extras={}, message=nil)
        clean_backtrace do 
          path = "/#{path}" unless path[0..0] == '/'
          # Load routes.rb if it hasn't been loaded.
          ActionController::Routing::Routes.reload if ActionController::Routing::Routes.empty? 
      
          # Assume given controller
          request = ActionController::TestRequest.new({}, {}, nil)
          request.path = path
          ActionController::Routing::Routes.recognize!(request)
      
          expected_options = expected_options.clone
          extras.each_key { |key| expected_options.delete key } unless extras.nil?
      
          expected_options.stringify_keys!
          msg = build_message(message, "The recognized options <?> did not match <?>", 
              request.path_parameters, expected_options)
          assert_block(msg) { request.path_parameters == expected_options }
        end
      end

      # Asserts that the provided options can be used to generate the provided path.
      def assert_generates(expected_path, options, defaults={}, extras = {}, message=nil)
        clean_backtrace do 
          expected_path = "/#{expected_path}" unless expected_path[0] == ?/
          # Load routes.rb if it hasn't been loaded.
          ActionController::Routing::Routes.reload if ActionController::Routing::Routes.empty? 
      
          generated_path, extra_keys = ActionController::Routing::Routes.generate(options, extras)
          found_extras = options.reject {|k, v| ! extra_keys.include? k}

          msg = build_message(message, "found extras <?>, not <?>", found_extras, extras)
          assert_block(msg) { found_extras == extras }
      
          msg = build_message(message, "The generated path <?> did not match <?>", generated_path, 
              expected_path)
          assert_block(msg) { expected_path == generated_path }
        end
      end

      # asserts that path and options match both ways, in other words, the URL generated from 
      # options is same as path, and also that the options recognized from path are same as options
      def assert_routing(path, options, defaults={}, extras={}, message=nil)
        assert_recognizes(options, path, extras, message)
        
        controller, default_controller = options[:controller], defaults[:controller] 
        if controller && controller.include?(?/) && default_controller && default_controller.include?(?/)
          options[:controller] = "/#{controller}"
        end
         
        assert_generates(path, options, defaults, extras, message)
      end

      # Asserts that there is a tag/node/element in the body of the response
      # that meets all of the given conditions. The +conditions+ parameter must
      # be a hash of any of the following keys (all are optional):
      #
      # * <tt>:tag</tt>: the node type must match the corresponding value
      # * <tt>:attributes</tt>: a hash. The node's attributes must match the
      #   corresponding values in the hash.
      # * <tt>:parent</tt>: a hash. The node's parent must match the
      #   corresponding hash.
      # * <tt>:child</tt>: a hash. At least one of the node's immediate children
      #   must meet the criteria described by the hash.
      # * <tt>:ancestor</tt>: a hash. At least one of the node's ancestors must
      #   meet the criteria described by the hash.
      # * <tt>:descendant</tt>: a hash. At least one of the node's descendants
      #   must meet the criteria described by the hash.
      # * <tt>:sibling</tt>: a hash. At least one of the node's siblings must
      #   meet the criteria described by the hash.
      # * <tt>:after</tt>: a hash. The node must be after any sibling meeting
      #   the criteria described by the hash, and at least one sibling must match.
      # * <tt>:before</tt>: a hash. The node must be before any sibling meeting
      #   the criteria described by the hash, and at least one sibling must match.
      # * <tt>:children</tt>: a hash, for counting children of a node. Accepts
      #   the keys:
      #   * <tt>:count</tt>: either a number or a range which must equal (or
      #     include) the number of children that match.
      #   * <tt>:less_than</tt>: the number of matching children must be less
      #     than this number.
      #   * <tt>:greater_than</tt>: the number of matching children must be
      #     greater than this number.
      #   * <tt>:only</tt>: another hash consisting of the keys to use
      #     to match on the children, and only matching children will be
      #     counted.
      # * <tt>:content</tt>: the textual content of the node must match the
      #     given value. This will not match HTML tags in the body of a
      #     tag--only text.
      #
      # Conditions are matched using the following algorithm:
      #
      # * if the condition is a string, it must be a substring of the value.
      # * if the condition is a regexp, it must match the value.
      # * if the condition is a number, the value must match number.to_s.
      # * if the condition is +true+, the value must not be +nil+.
      # * if the condition is +false+ or +nil+, the value must be +nil+.
      #
      # Usage:
      #
      #   # assert that there is a "span" tag
      #   assert_tag :tag => "span"
      #
      #   # assert that there is a "span" inside of a "div"
      #   assert_tag :tag => "span", :parent => { :tag => "div" }
      #
      #   # assert that there is a "span" somewhere inside a table
      #   assert_tag :tag => "span", :ancestor => { :tag => "table" }
      #
      #   # assert that there is a "span" with at least one "em" child
      #   assert_tag :tag => "span", :child => { :tag => "em" }
      #
      #   # assert that there is a "span" containing a (possibly nested)
      #   # "strong" tag.
      #   assert_tag :tag => "span", :descendant => { :tag => "strong" }
      #
      #   # assert that there is a "span" containing between 2 and 4 "em" tags
      #   # as immediate children
      #   assert_tag :tag => "span",
      #              :children => { :count => 2..4, :only => { :tag => "em" } } 
      #
      #   # get funky: assert that there is a "div", with an "ul" ancestor
      #   # and an "li" parent (with "class" = "enum"), and containing a 
      #   # "span" descendant that contains text matching /hello world/
      #   assert_tag :tag => "div",
      #              :ancestor => { :tag => "ul" },
      #              :parent => { :tag => "li",
      #                           :attributes => { :class => "enum" } },
      #              :descendant => { :tag => "span",
      #                               :child => /hello world/ }
      def assert_tag(opts)
        clean_backtrace do
          tag = find_tag(opts)
          assert tag, "expected tag, but no tag found matching #{opts.inspect} in:\n#{@response.body.inspect}"
        end
      end
      
      # Identical to #assert_tag, but asserts that a matching tag does _not_
      # exist. (See #assert_tag for a full discussion of the syntax.)
      def assert_no_tag(opts)
        clean_backtrace do
          tag = find_tag(opts)
          assert !tag, "expected no tag, but found tag matching #{opts.inspect} in:\n#{@response.body.inspect}"
        end
      end

      # test 2 html strings to be equivalent, i.e. identical up to reordering of attributes
      def assert_dom_equal(expected, actual, message="")
        clean_backtrace do
          expected_dom = HTML::Document.new(expected).root
          actual_dom = HTML::Document.new(actual).root
          full_message = build_message(message, "<?> expected to be == to\n<?>.", expected_dom.to_s, actual_dom.to_s)
          assert_block(full_message) { expected_dom == actual_dom }
        end
      end
      
      # negated form of +assert_dom_equivalent+
      def assert_dom_not_equal(expected, actual, message="")
        clean_backtrace do
          expected_dom = HTML::Document.new(expected).root
          actual_dom = HTML::Document.new(actual).root
          full_message = build_message(message, "<?> expected to be != to\n<?>.", expected_dom.to_s, actual_dom.to_s)
          assert_block(full_message) { expected_dom != actual_dom }
        end
      end

      # ensures that the passed record is valid by active record standards. returns the error messages if not
      def assert_valid(record)                                   
        clean_backtrace do
          assert record.valid?, record.errors.full_messages        
        end
      end             
      
      def clean_backtrace(&block)
        begin
          yield
        rescue AssertionFailedError => e         
          path = File.expand_path(__FILE__)
          raise AssertionFailedError, e.message, e.backtrace.reject { |line| File.expand_path(line) =~ /#{path}/ }
        end           
      end
    end
  end
end