Skip to content
This repository
branch: 2-11-maintenan…
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 467 lines (407 sloc) 16.173 kb
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
module RSpec
  module Core
    # ExampleGroup and {Example} are the main structural elements of
    # rspec-core. Consider this example:
    #
    # describe Thing do
    # it "does something" do
    # end
    # end
    #
    # The object returned by `describe Thing` is a subclass of ExampleGroup.
    # The object returned by `it "does something"` is an instance of Example,
    # which serves as a wrapper for an instance of the ExampleGroup in which it
    # is declared.
    class ExampleGroup
      extend MetadataHashBuilder::WithDeprecationWarning
      extend Extensions::ModuleEvalWithArgs
      extend Subject::ExampleGroupMethods
      extend Hooks

      include Extensions::InstanceEvalWithArgs
      include Subject::ExampleMethods
      include Pending
      include Let

      # @private
      def self.world
        RSpec.world
      end

      # @private
      def self.register
        world.register(self)
      end

      class << self
        # @private
        def self.delegate_to_metadata(*names)
          names.each do |name|
            define_method name do
              metadata[:example_group][name]
            end
          end
        end

        delegate_to_metadata :description, :described_class, :file_path
        alias_method :display_name, :description
        # @private
        alias_method :describes, :described_class

        # @private
        # @macro [attach] define_example_method
        # @param [String] name
        # @param [Hash] extra_options
        # @param [Block] implementation
        def self.define_example_method(name, extra_options={})
          module_eval(<<-END_RUBY, __FILE__, __LINE__)
def #{name}(desc=nil, *args, &block)
options = build_metadata_hash_from(args)
options.update(:pending => RSpec::Core::Pending::NOT_YET_IMPLEMENTED) unless block
options.update(#{extra_options.inspect})
examples << RSpec::Core::Example.new(self, desc, options, block)
examples.last
end
END_RUBY
        end

        # Defines an example within a group.
        define_example_method :example
        # Defines an example within a group.
        #
        # @see example
        define_example_method :it
        # Defines an example within a group.
        # This is here primarily for backward compatibility with early versions
        # of RSpec which used `context` and `specify` instead of `describe` and
        # `it`.
        define_example_method :specify

        # Shortcut to define an example with `:focus` => true
        define_example_method :focus, :focused => true, :focus => true
        # Shortcut to define an example with `:focus` => true
        define_example_method :focused, :focused => true, :focus => true

        # Shortcut to define an example with :pending => true
        define_example_method :pending, :pending => true
        # Shortcut to define an example with :pending => 'Temporarily disabled with xexample'
        define_example_method :xexample, :pending => 'Temporarily disabled with xexample'
        # Shortcut to define an example with :pending => 'Temporarily disabled with xit'
        define_example_method :xit, :pending => 'Temporarily disabled with xit'
        # Shortcut to define an example with :pending => 'Temporarily disabled with xspecify'
        define_example_method :xspecify, :pending => 'Temporarily disabled with xspecify'

        # Works like `alias_method :name, :example` with the added benefit of
        # assigning default metadata to the generated example.
        #
        # @note Use with caution. This extends the language used in your
        # specs, but does not add any additional documentation. We use this
        # in rspec to define methods like `focus` and `xit`, but we also add
        # docs for those methods.
        def alias_example_to name, extra={}
          (class << self; self; end).define_example_method name, extra
        end

        # @private
        # @macro [attach] define_nested_shared_group_method
        #
        # @see SharedExampleGroup
        def self.define_nested_shared_group_method(new_name, report_label=nil)
          module_eval(<<-END_RUBY, __FILE__, __LINE__)
def #{new_name}(name, *args, &customization_block)
group = describe("#{report_label || "it should behave like"} \#{name}") do
find_and_eval_shared("examples", name, *args, &customization_block)
end
group.metadata[:shared_group_name] = name
group
end
END_RUBY
        end

        # Generates a nested example group and includes the shared content
        # mapped to `name` in the nested group.
        define_nested_shared_group_method :it_behaves_like, "behaves like"
        # Generates a nested example group and includes the shared content
        # mapped to `name` in the nested group.
        define_nested_shared_group_method :it_should_behave_like

        # Works like `alias_method :name, :it_behaves_like` with the added
        # benefit of assigning default metadata to the generated example.
        #
        # @note Use with caution. This extends the language used in your
        # specs, but does not add any additional documentation. We use this
        # in rspec to define `it_should_behave_like` (for backward
        # compatibility), but we also add docs for that method.
        def alias_it_behaves_like_to name, *args, &block
          (class << self; self; end).define_nested_shared_group_method name, *args, &block
        end
      end

      # Includes shared content mapped to `name` directly in the group in which
      # it is declared, as opposed to `it_behaves_like`, which creates a nested
      # group. If given a block, that block is also eval'd in the current context.
      #
      # @see SharedExampleGroup
      def self.include_context(name, *args, &block)
        find_and_eval_shared("context", name, *args, &block)
      end

      # Includes shared content mapped to `name` directly in the group in which
      # it is declared, as opposed to `it_behaves_like`, which creates a nested
      # group. If given a block, that block is also eval'd in the current context.
      #
      # @see SharedExampleGroup
      def self.include_examples(name, *args, &block)
        find_and_eval_shared("examples", name, *args, &block)
      end

      # @private
      def self.find_and_eval_shared(label, name, *args, &customization_block)
        raise ArgumentError, "Could not find shared #{label} #{name.inspect}" unless
        shared_block = world.shared_example_groups[name]

        module_eval_with_args(*args, &shared_block)
        module_eval(&customization_block) if customization_block
      end

      # @private
      def self.examples
        @examples ||= []
      end

      # @private
      def self.filtered_examples
        world.filtered_examples[self]
      end

      # @private
      def self.descendant_filtered_examples
        @descendant_filtered_examples ||= filtered_examples + children.inject([]){|l,c| l + c.descendant_filtered_examples}
      end

      # The [Metadata](Metadata) object associated with this group.
      # @see Metadata
      def self.metadata
        @metadata if defined?(@metadata)
      end

      # @private
      # @return [Metadata] belonging to the parent of a nested {ExampleGroup}
      def self.superclass_metadata
        @superclass_metadata ||= self.superclass.respond_to?(:metadata) ? self.superclass.metadata : nil
      end

      # Generates a subclass of this example group which inherits
      # everything except the examples themselves.
      #
      # ## Examples
      #
      # describe "something" do # << This describe method is defined in
      # # << RSpec::Core::DSL, included in the
      # # << global namespace
      # before do
      # do_something_before
      # end
      #
      # let(:thing) { Thing.new }
      #
      # describe "attribute (of something)" do
      # # examples in the group get the before hook
      # # declared above, and can access `thing`
      # end
      # end
      #
      # @see DSL#describe
      def self.describe(*args, &example_group_block)
        @_subclass_count ||= 0
        @_subclass_count += 1
        args << {} unless args.last.is_a?(Hash)
        args.last.update(:example_group_block => example_group_block)

        # TODO 2010-05-05: Because we don't know if const_set is thread-safe
        child = const_set(
          "Nested_#{@_subclass_count}",
          subclass(self, args, &example_group_block)
        )
        children << child
        child
      end

      class << self
        alias_method :context, :describe
      end

      # @private
      def self.subclass(parent, args, &example_group_block)
        subclass = Class.new(parent)
        subclass.set_it_up(*args)
        subclass.module_eval(&example_group_block) if example_group_block
        subclass
      end

      # @private
      def self.children
        @children ||= [].extend(Extensions::Ordered)
      end

      # @private
      def self.descendants
        @_descendants ||= [self] + children.inject([]) {|list, c| list + c.descendants}
      end

      # @private
      def self.ancestors
        @_ancestors ||= super().select {|a| a < RSpec::Core::ExampleGroup}
      end

      # @private
      def self.top_level?
        @top_level ||= superclass == ExampleGroup
      end

      # @private
      def self.ensure_example_groups_are_configured
        unless defined?(@@example_groups_configured)
          RSpec.configuration.configure_mock_framework
          RSpec.configuration.configure_expectation_framework
          @@example_groups_configured = true
        end
      end

      # @private
      def self.set_it_up(*args)
        # Ruby 1.9 has a bug that can lead to infinite recursion and a
        # SystemStackError if you include a module in a superclass after
        # including it in a subclass: https://gist.github.com/845896
        # To prevent this, we must include any modules in RSpec::Core::ExampleGroup
        # before users create example groups and have a chance to include
        # the same module in a subclass of RSpec::Core::ExampleGroup.
        # So we need to configure example groups here.
        ensure_example_groups_are_configured

        symbol_description = args.shift if args.first.is_a?(Symbol)
        args << build_metadata_hash_from(args)
        args.unshift(symbol_description) if symbol_description
        @metadata = RSpec::Core::Metadata.new(superclass_metadata).process(*args)
        world.configure_group(self)
        hooks.register_globals(self, RSpec.configuration.hooks)
      end

      # @private
      def self.before_all_ivars
        @before_all_ivars ||= {}
      end

      # @private
      def self.store_before_all_ivars(example_group_instance)
        return if example_group_instance.instance_variables.empty?
        example_group_instance.instance_variables.each { |ivar|
          before_all_ivars[ivar] = example_group_instance.instance_variable_get(ivar)
        }
      end

      # @private
      def self.assign_before_all_ivars(ivars, example_group_instance)
        ivars.each { |ivar, val| example_group_instance.instance_variable_set(ivar, val) }
      end

      # @private
      def self.run_before_all_hooks(example_group_instance)
        return if descendant_filtered_examples.empty?
        assign_before_all_ivars(superclass.before_all_ivars, example_group_instance)
        run_hook(:before, :all, example_group_instance)
        store_before_all_ivars(example_group_instance)
      end

      # @private
      def self.run_around_each_hooks(example, initial_procsy)
        run_hook(:around, :each, example, initial_procsy)
      end

      # @private
      def self.run_before_each_hooks(example)
        run_hook(:before, :each, example)
      end

      # @private
      def self.run_after_each_hooks(example)
        run_hook(:after, :each, example)
      end

      # @private
      def self.run_after_all_hooks(example_group_instance)
        return if descendant_filtered_examples.empty?
        assign_before_all_ivars(before_all_ivars, example_group_instance)

        begin
          run_hook(:after, :all, example_group_instance)
        rescue => e
          # TODO: come up with a better solution for this.
          RSpec.configuration.reporter.message <<-EOS

An error occurred in an after(:all) hook.
#{e.class}: #{e.message}
occurred at #{e.backtrace.first}

EOS
        end
      end

      # Runs all the examples in this group
      def self.run(reporter)
        if RSpec.wants_to_quit
          RSpec.clear_remaining_example_groups if top_level?
          return
        end
        reporter.example_group_started(self)

        begin
          run_before_all_hooks(new)
          result_for_this_group = run_examples(reporter)
          results_for_descendants = children.ordered.map {|child| child.run(reporter)}.all?
          result_for_this_group && results_for_descendants
        rescue Exception => ex
          fail_filtered_examples(ex, reporter)
        ensure
          run_after_all_hooks(new)
          before_all_ivars.clear
          reporter.example_group_finished(self)
        end
      end

      # @private
      def self.run_examples(reporter)
        filtered_examples.ordered.map do |example|
          next if RSpec.wants_to_quit
          instance = new
          set_ivars(instance, before_all_ivars)
          succeeded = example.run(instance, reporter)
          RSpec.wants_to_quit = true if fail_fast? && !succeeded
          succeeded
        end.all?
      end

      # @private
      def self.fail_filtered_examples(exception, reporter)
        filtered_examples.each { |example| example.fail_with_exception(reporter, exception) }

        children.each do |child|
          reporter.example_group_started(child)
          child.fail_filtered_examples(exception, reporter)
          reporter.example_group_finished(child)
        end
        false
      end

      # @private
      def self.fail_fast?
        RSpec.configuration.fail_fast?
      end

      # @private
      def self.any_apply?(filters)
        metadata.any_apply?(filters)
      end

      # @private
      def self.all_apply?(filters)
        metadata.all_apply?(filters)
      end

      # @private
      def self.declaration_line_numbers
        @declaration_line_numbers ||= [metadata[:example_group][:line_number]] +
          examples.collect {|e| e.metadata[:line_number]} +
          children.inject([]) {|l,c| l + c.declaration_line_numbers}
      end

      # @private
      def self.top_level_description
        ancestors.last.description
      end

      # @private
      def self.set_ivars(instance, ivars)
        ivars.each {|name, value| instance.instance_variable_set(name, value)}
      end

      # @attr_reader
      # Returns the {Example} object that wraps this instance of
      # `ExampleGroup`
      attr_accessor :example

      # @deprecated use {ExampleGroup#example}
      def running_example
        RSpec.deprecate("running_example", "example")
        example
      end

      # Returns the class or module passed to the `describe` method (or alias).
      # Returns nil if the subject is not a class or module.
      # @example
      # describe Thing do
      # it "does something" do
      # described_class == Thing
      # end
      # end
      #
      #
      def described_class
        self.class.described_class
      end

      # @private
      # instance_evals the block, capturing and reporting an exception if
      # raised
      def instance_eval_with_rescue(context = nil, &hook)
        begin
          instance_eval(&hook)
        rescue Exception => e
          raise unless example
          example.set_exception(e, context)
        end
      end
    end
  end
end
Something went wrong with that request. Please try again.