v1.14.0

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rscons (1.11.0)
+    rscons (1.13.0)
       json (~> 1.0)
 
 GEM

README.md

@@ -560,10 +560,44 @@ env.depends("my_app", "config/link.ld", "README.txt", *Dir.glob("assets/**/*"))
 ### API documentation
 
 Documentation for the complete Rscons API can be found at
-http://rubydoc.info/github/holtrop/rscons/frames.
+http://www.rubydoc.info/github/holtrop/rscons/master.
 
 ## Release Notes
 
+### v1.14.0
+
+#### New Features
+
+- #45 - Add Rscons::VarSet#values_at
+
+#### Fixes
+
+- #44 - Environment#print_builder_run_message should support string commands
+
+### v1.13.0
+
+#### New Features
+
+- #43 - Add ability to record side-effect file production
+
+### v1.12.0
+
+#### New Features
+
+- #40 - env.depends should imply env.build_after
+- #41 - be more colorful
+
+#### Fixes
+
+- #39 - wait for in-progress subcommands to complete on build failure
+- #42 - cloned Environments should inherit n_threads
+
+### v1.11.1
+
+#### Fixes
+
+- fix the circular build dependency detection logic
+
 ### v1.11.0
 
 #### New Features

build_tests/build_dir/echo_command_ruby_builder.rb

@@ -0,0 +1,5 @@
+Rscons::Environment.new do |env|
+  env.echo = :command
+  env.Install("inst.exe", "install.rb")
+end
+

build_tests/build_dir/echo_command_string.rb

@@ -0,0 +1,13 @@
+class MyBuilder < Rscons::Builder
+  def run(options)
+    env, target = options.values_at(:env, :target)
+    env.print_builder_run_message("MyBuilder #{target}", "MyBuilder #{target} command")
+    target
+  end
+end
+
+Rscons::Environment.new do |env|
+  env.echo = :command
+  env.add_builder(MyBuilder.new)
+  env.MyBuilder("foo")
+end

build_tests/custom_builder/produces.rb

@@ -0,0 +1,14 @@
+Rscons::Environment.new do |env|
+  env["build_root"] = env.build_root
+  env["inc_h"] = "inc.h"
+
+  env.Copy("copy_inc.h", "${inc_h}")
+  env.depends("${build_root}/program.o", "${inc_h}")
+  env.Program("program.exe", ["program.c", "inc.c"])
+
+  env.Command("inc.c",
+              [],
+              "CMD" => %w[ruby gen.rb ${_TARGET}],
+              "CMD_DESC" => "Generating")
+  env.produces("inc.c", "inc.h")
+end

build_tests/simple/clone_n_threads.rb

@@ -0,0 +1,7 @@
+base_env = Rscons::Environment.new do |env|
+  env.n_threads = 165
+end
+
+my_env = base_env.clone
+
+puts my_env.n_threads

build_tests/simple/user_dep_build_order.rb

@@ -0,0 +1,22 @@
+class TestBuilder < Rscons::Builder
+  def run(options)
+    target, env, vars, cache = options.values_at(:target, :env, :vars, :cache)
+    if target == "two"
+      return false unless File.exists?("one")
+    end
+    wait_time = env.expand_varref("${wait_time}", vars)
+    command = ["ruby", "-e", "require 'fileutils'; sleep #{wait_time}; FileUtils.touch('#{target}');"]
+    standard_threaded_build("TestBuilder", target, command, [], env, cache)
+  end
+
+  def finalize(options)
+    standard_finalize(options)
+  end
+end
+
+Rscons::Environment.new do |env|
+  env.add_builder(TestBuilder.new)
+  env.TestBuilder("one", [], "wait_time" => "3")
+  env.TestBuilder("two", [], "wait_time" => "0")
+  env.depends("two", "one")
+end

build_tests/simple/wait_for_builds_on_failure.rb

@@ -0,0 +1,20 @@
+class Fail < Rscons::Builder
+  def run(options)
+    target, cache, env, vars = options.values_at(:target, :cache, :env, :vars)
+    wait_time = env.expand_varref("${wait_time}", vars)
+    ruby_command = %[sleep #{wait_time}; exit 2]
+    command = %W[ruby -e #{ruby_command}]
+    standard_threaded_build("Fail #{target}", target, command, [], env, cache)
+  end
+  def finalize(options)
+    standard_finalize(options)
+  end
+end
+
+Rscons::Environment.new do |env|
+  env.add_builder(Fail.new)
+  4.times do |i|
+    wait_time = i + 1
+    env.Fail("foo_#{wait_time}", [], "wait_time" => wait_time.to_s)
+  end
+end

lib/rscons.rb

@@ -1,3 +1,4 @@
+require_relative "rscons/ansi"
 require_relative "rscons/build_target"
 require_relative "rscons/builder"
 require_relative "rscons/cache"
@@ -50,6 +51,10 @@ module Rscons
     #   The number of threads to use when scheduling subprocesses.
     attr_accessor :n_threads
 
+    # @return [Boolean]
+    #   Whether to output ANSI color escape sequences.
+    attr_accessor :do_ansi_color
+
     # Remove all generated files.
     #
     # @return [void]

lib/rscons/ansi.rb

@@ -0,0 +1,53 @@
+module Rscons
+  # Module to contain logic to write ANSI color escape codes.
+  module Ansi
+    class << self
+
+      # Write a message to an IO with ANSI escape codes.
+      #
+      # @param io [IO]
+      #   The IO to write to.
+      # @param message [Array<String, Symbol>]
+      #   Strings to be printed, with Symbols representing ANSI escape codes.
+      #
+      # @return [void]
+      def write(io, *message)
+        do_color = Rscons.do_ansi_color
+        if do_color.nil?
+          do_color = do_ansi?(io)
+        end
+        out = ""
+        message.each do |m|
+          if m.is_a?(String)
+            out += m
+          elsif do_color
+            case m
+            when :red
+              out += "\e[0;31m"
+            when :cyan
+              out += "\e[0;36m"
+            when :reset
+              out += "\e[0m"
+            end
+          end
+        end
+        io.write(out)
+      end
+
+      private
+
+      # Determine whether to output ANSI color escape codes.
+      #
+      # @return [Boolean]
+      #   Whether to output ANSI color escape codes.
+      def do_ansi?(io)
+        if RUBY_PLATFORM =~ /mingw/
+          (ENV["TERM"] == "xterm") && %w[fifo characterSpecial].include?(io.stat.ftype)
+        else
+          io.tty?
+        end
+      end
+
+    end
+  end
+end

lib/rscons/builder.rb

@@ -231,7 +231,7 @@ module Rscons
     # @param env [Environment] The Environment executing the builder.
     # @param cache [Cache] The Cache object.
     # @param options [Hash] Options.
-    # @options options [String] :stdout
+    # @option options [String] :stdout
     #   File name to redirect standard output to.
     #
     # @return [String,ThreadedCommand]

lib/rscons/builders/directory.rb

@@ -17,10 +17,10 @@ module Rscons
         if File.directory?(target)
           target
         elsif File.exists?(target)
-          $stderr.puts "Error: `#{target}' already exists and is not a directory"
+          Ansi.write($stderr, :red, "Error: `#{target}' already exists and is not a directory", :reset, "\n")
           false
         else
-          puts "Directory #{target}"
+          env.print_builder_run_message("Directory #{target}", nil)
           cache.mkdir_p(target)
           target
         end

lib/rscons/builders/install.rb

@@ -43,7 +43,7 @@ module Rscons
           # Check the cache and copy if necessary
           unless cache.up_to_date?(dest, :Copy, [src], env)
             unless printed_message
-              puts "#{name} #{target}"
+              env.print_builder_run_message("#{name} #{target}", nil)
               printed_message = true
             end
             cache.mkdir_p(File.dirname(dest))

lib/rscons/cli.rb

@@ -39,6 +39,15 @@ module Rscons
             Rscons.n_threads = n_threads.to_i
           end
 
+          opts.on("-r", "--color MODE", "Set color mode (off, auto, force)") do |color_mode|
+            case color_mode
+            when "off"
+              Rscons.do_ansi_color = false
+            when "force"
+              Rscons.do_ansi_color = true
+            end
+          end
+
           opts.on_tail("--version", "Show version") do
             puts "Rscons version #{Rscons::VERSION}"
             exit 0
@@ -70,7 +79,6 @@ module Rscons
         begin
           load rsconsfile
         rescue Rscons::BuildError => e
-          $stderr.puts e.message
           exit 1
         end
 

lib/rscons/environment.rb

@@ -45,8 +45,9 @@ module Rscons
     def initialize(options = {})
       @threaded_commands = Set.new
       @registered_build_dependencies = {}
+      @side_effects = {}
       @varset = VarSet.new
-      @job_set = JobSet.new(@registered_build_dependencies)
+      @job_set = JobSet.new(@registered_build_dependencies, @side_effects)
       @user_deps = {}
       @builders = {}
       @build_dirs = []
@@ -118,6 +119,7 @@ module Rscons
           env.add_post_build_hook(&build_hook_block)
         end
       end
+      env.instance_variable_set(:@n_threads, @n_threads)
 
       if block_given?
         yield env
@@ -302,13 +304,19 @@ module Rscons
     # @return [void]
     def process
       cache = Cache.instance
+      failure = nil
       begin
         while @job_set.size > 0 or @threaded_commands.size > 0
 
+          if failure
+            @job_set.clear!
+            job = nil
+          else
             targets_still_building = @threaded_commands.map do |tc|
               tc.build_operation[:target]
             end
             job = @job_set.get_next_job_to_run(targets_still_building)
+          end
 
           # TODO: have Cache determine when checksums may be invalid based on
           # file size and/or timestamp.
@@ -323,7 +331,9 @@ module Rscons
                                  allow_delayed_execution: true,
                                  setup_info: job[:setup_info])
             unless result
-              raise BuildError.new("Failed to build #{job[:target]}")
+              failure = "Failed to build #{job[:target]}"
+              Ansi.write($stderr, :red, failure, :reset, "\n")
+              next
             end
           end
 
@@ -349,9 +359,11 @@ module Rscons
               end
             else
               unless @echo == :command
-                $stdout.puts "Failed command was: #{command_to_s(tc.command)}"
+                print_failed_command(tc.command)
               end
-              raise BuildError.new("Failed to build #{tc.build_operation[:target]}")
+              failure = "Failed to build #{tc.build_operation[:target]}"
+              Ansi.write($stderr, :red, failure, :reset, "\n")
+              break
             end
           end
 
@@ -359,6 +371,9 @@ module Rscons
       ensure
         cache.write
       end
+      if failure
+        raise BuildError.new(failure)
+      end
     end
 
     # Clear all targets registered for the Environment.
@@ -398,16 +413,12 @@ module Rscons
     #
     # @return [true,false,nil] Return value from Kernel.system().
     def execute(short_desc, command, options = {})
-      if @echo == :command
+      print_builder_run_message(short_desc, command)
-        puts command_to_s(command)
-      elsif @echo == :short
-        puts short_desc
-      end
       env_args = options[:env] ? [options[:env]] : []
       options_args = options[:options] ? [options[:options]] : []
       system(*env_args, *Rscons.command_executer, *command, *options_args).tap do |result|
         unless result or @echo == :command
-          $stdout.puts "Failed command was: #{command_to_s(command)}"
+          print_failed_command(command)
         end
       end
     end
@@ -451,6 +462,7 @@ module Rscons
       user_deps = user_deps.map {|ud| expand_varref(ud)}
       @user_deps[target] ||= []
       @user_deps[target] = (@user_deps[target] + user_deps).uniq
+      build_after(target, user_deps)
     end
 
     # Manually record the given target(s) as needing to be built after the
@@ -491,6 +503,26 @@ module Rscons
       end
     end
 
+    # Manually record the given side effect file(s) as being produced when the
+    # named target is produced.
+    #
+    # @since 1.13.0
+    #
+    # @param target [String]
+    #   Target of a build operation.
+    # @param side_effects [Array<String>]
+    #   File(s) produced when the target file is produced.
+    #
+    # @return [void]
+    def produces(target, *side_effects)
+      target = expand_path(expand_varref(target))
+      side_effects = Array(side_effects).map do |side_effect|
+        expand_path(expand_varref(side_effect))
+      end.flatten
+      @side_effects[target] ||= []
+      @side_effects[target] += side_effects
+    end
+
     # Return the list of user dependencies for a given target.
     #
     # @param target [String] Target file name.
@@ -642,7 +674,7 @@ module Rscons
             call_build_hooks[:post]
           else
             unless @echo == :command
-              $stdout.puts "Failed command was: #{command_to_s(tc.command)}"
+              print_failed_command(tc.command)
             end
           end
         end
@@ -829,7 +861,7 @@ module Rscons
       varset_hash = @varset.to_h
       varset_hash.keys.sort_by(&:to_s).each do |var|
         var_str = var.is_a?(Symbol) ? var.inspect : var
-        puts "#{var_str} => #{varset_hash[var].inspect}"
+        Ansi.write($stdout, :cyan, var_str, :reset, " => #{varset_hash[var].inspect}\n")
       end
     end
 
@@ -842,6 +874,40 @@ module Rscons
       @n_threads || Rscons.n_threads
     end
 
+    # Print the builder run message, depending on the Environment's echo mode.
+    #
+    # @param short_description [String]
+    #   Builder short description, printed if the echo mode is :short.
+    # @param command [Array<String>]
+    #   Builder command, printed if the echo mode is :command.
+    #
+    # @return [void]
+    def print_builder_run_message(short_description, command)
+      case @echo
+      when :command
+        if command.is_a?(Array)
+          message = command_to_s(command)
+        elsif command.is_a?(String)
+          message = command
+        elsif short_description.is_a?(String)
+          message = short_description
+        end
+      when :short
+        message = short_description if short_description
+      end
+      Ansi.write($stdout, :cyan, message, :reset, "\n") if message
+    end
+
+    # Print a failed command.
+    #
+    # @param command [Array<String>]
+    #   Builder command.
+    #
+    # @return [void]
+    def print_failed_command(command)
+      Ansi.write($stdout, :red, "Failed command was: #{command_to_s(command)}", :reset, "\n")
+    end
+
     private
 
     # Add a build target.
@@ -874,13 +940,7 @@ module Rscons
     #
     # @return [void]
     def start_threaded_command(tc)
-      if @echo == :command
+      print_builder_run_message(tc.short_description, tc.command)
-        puts command_to_s(tc.command)
-      elsif @echo == :short
-        if tc.short_description
-          puts tc.short_description
-        end
-      end
 
       env_args = tc.system_env ? [tc.system_env] : []
       options_args = tc.system_options ? [tc.system_options] : []

lib/rscons/job_set.rb

@@ -9,9 +9,14 @@ module Rscons
     # @param build_dependencies [Hash]
     #   Hash mapping targets to a set of build dependencies. A job will not be
     #   returned as ready to run if any of its dependencies are still building.
-    def initialize(build_dependencies)
+    # @param side_effects [Hash]
+    #   Hash mapping targets to a set of side-effect files. A job will not be
+    #   returned as ready to run if any of its dependencies is a side-effect
+    #   of another target that has not yet been built.
+    def initialize(build_dependencies, side_effects)
       @jobs = {}
       @build_dependencies = build_dependencies
+      @side_effects = side_effects
     end
 
     # Add a job to the JobSet.
@@ -47,24 +52,16 @@ module Rscons
     # @return [nil, Hash]
     #   The next job to run.
     def get_next_job_to_run(targets_still_building)
-      targets_skipped = Set.new
+      targets_not_built_yet = targets_still_building + @jobs.keys
+      side_effects = targets_not_built_yet.map do |target|
+        @side_effects[target] || []
+      end.flatten
+      targets_not_built_yet += side_effects
+
       @jobs.keys.each do |target|
         skip = false
         (@jobs[target][0][:sources] + (@build_dependencies[target] || []).to_a).each do |src|
-          if @jobs.include?(src)
+          if targets_not_built_yet.include?(src)
-            if targets_skipped.include?(src) or (src == target)
-              # We have encountered a circular dependency.
-              raise "Circular build dependency for #{src}"
-            end
-            # Skip this target because it depends on another target later in
-            # the job set.
-            targets_skipped << target
-            skip = true
-            break
-          end
-          if targets_still_building.include?(src)
-            # Skip this target because it depends on another target that is
-            # still being built.
             skip = true
             break
           end
@@ -79,7 +76,12 @@ module Rscons
         return job
       end
 
-      nil
+      # If there is a job to run, and nothing is still building, but we did
+      # not find a job to run above, then there might be a circular dependency
+      # introduced by the user.
+      if (@jobs.size > 0) and targets_still_building.empty?
+        raise "Could not find a runnable job. Possible circular dependency for #{@jobs.keys.first}"
+      end
     end
 
     # Remove all jobs from the JobSet.

lib/rscons/varset.rb

@@ -143,6 +143,19 @@ module Rscons
       end
     end
 
+    # Return an array containing the values associated with the given keys.
+    #
+    # @param keys [Array<String, Symbol>]
+    #   Keys to look up in the VarSet.
+    #
+    # @return [Array]
+    #   An array containing the values associated with the given keys.
+    def values_at(*keys)
+      keys.map do |key|
+        self[key]
+      end
+    end
+
     private
 
     # Move all VarSet variables into the copy-on-access list.

lib/rscons/version.rb

@@ -1,4 +1,4 @@
 module Rscons
   # gem version
-  VERSION = "1.11.0"
+  VERSION = "1.14.0"
 end

spec/build_tests_spec.rb

@@ -735,17 +735,79 @@ EOF
   it "raises an error for a circular dependency" do
     test_dir("simple")
     result = run_test(rsconsfile: "error_circular_dependency.rb")
-    expect(result.stderr).to match /Circular build dependency for (foo|bar|baz)/
+    expect(result.stderr).to match /Possible circular dependency for (foo|bar|baz)/
     expect(result.status).to_not eq 0
   end
 
   it "raises an error for a circular dependency where a build target contains itself in its source list" do
     test_dir("simple")
     result = run_test(rsconsfile: "error_circular_dependency2.rb")
-    expect(result.stderr).to match /Circular build dependency for foo/
+    expect(result.stderr).to match /Possible circular dependency for foo/
     expect(result.status).to_not eq 0
   end
 
+  it "orders builds to respect user dependencies" do
+    test_dir("simple")
+    result = run_test(rsconsfile: "user_dep_build_order.rb", rscons_args: %w[-j4])
+    expect(result.stderr).to eq ""
+  end
+
+  it "waits for all parallelized builds to complete if one fails" do
+    test_dir("simple")
+    result = run_test(rsconsfile: "wait_for_builds_on_failure.rb", rscons_args: %w[-j4])
+    expect(result.status).to_not eq 0
+    expect(result.stderr).to match /Failed to build foo_1/
+    expect(result.stderr).to match /Failed to build foo_2/
+    expect(result.stderr).to match /Failed to build foo_3/
+    expect(result.stderr).to match /Failed to build foo_4/
+  end
+
+  it "clones n_threads attribute when cloning an Environment" do
+    test_dir("simple")
+    result = run_test(rsconsfile: "clone_n_threads.rb")
+    expect(result.stderr).to eq ""
+    expect(lines(result.stdout)).to eq ["165"]
+  end
+
+  it "prints a builder's short description with 'command' echo mode if there is no command" do
+    test_dir("build_dir")
+
+    result = run_test(rsconsfile: "echo_command_ruby_builder.rb")
+    expect(result.stderr).to eq ""
+    expect(lines(result.stdout)).to eq ["Install inst.exe"]
+  end
+
+  it "supports a string for a builder's echoed 'command' with Environment#print_builder_run_message" do
+    test_dir("build_dir")
+
+    result = run_test(rsconsfile: "echo_command_string.rb")
+    expect(result.stderr).to eq ""
+    expect(lines(result.stdout)).to eq ["MyBuilder foo command"]
+  end
+
+  context "colored output" do
+    it "does not output in color with --color=off" do
+      test_dir("simple")
+      result = run_test(rscons_args: %w[--color=off])
+      expect(result.stderr).to eq ""
+      expect(result.stdout).to_not match(/\e\[/)
+    end
+
+    it "displays output in color with --color=force" do
+      test_dir("simple")
+
+      result = run_test(rscons_args: %w[--color=force])
+      expect(result.stderr).to eq ""
+      expect(result.stdout).to match(/\e\[/)
+
+      File.open("simple.c", "wb") do |fh|
+        fh.write("foobar")
+      end
+      result = run_test(rscons_args: %w[--color=force])
+      expect(result.stderr).to match(/\e\[/)
+    end
+  end
+
   context "backward compatibility" do
     it "allows a builder to call Environment#run_builder in a non-threaded manner" do
       test_dir("simple")
@@ -768,6 +830,21 @@ EOF
       ]
     end
 
+    it "prints the failed build command for a non-threaded builder" do
+      test_dir("simple")
+      File.open("simple.c", "wb") do |fh|
+        fh.write(<<EOF)
+void one()
+{
+}
+EOF
+      end
+      result = run_test(rsconsfile: "build_sources.rb")
+      expect(result.status).to_not eq 0
+      expect(result.stderr).to match /main/
+      expect(result.stdout).to match /Failed command was: gcc/
+    end
+
     it "prints the failed build command for a threaded builder when called via Environment#run_builder without delayed execution" do
       test_dir("simple")
       File.open("simple.c", "wb") do |fh|
@@ -1245,6 +1322,13 @@ EOF
       result = run_test(rsconsfile: "build_after.rb", rscons_args: %w[-j 4])
       expect(result.stderr).to eq ""
     end
+
+    it "allows the user to specify side-effect files produced by another builder" do
+      test_dir("custom_builder")
+      result = run_test(rsconsfile: "produces.rb", rscons_args: %w[-j 4])
+      expect(result.stderr).to eq ""
+      expect(File.exists?("copy_inc.h")).to be_truthy
+    end
   end
 
   context "CLI" do

spec/rscons/ansi_spec.rb

@@ -0,0 +1,33 @@
+module Rscons
+  describe Ansi do
+    describe ".do_ansi?" do
+
+      context "on Windows" do
+        it "returns true when IO is a fifo on an xterm" do
+          stub_const("RUBY_PLATFORM", "mingw")
+          expect(ENV).to receive(:[]).with("TERM").and_return("xterm")
+          io = double
+          expect(io).to receive(:stat).and_return(Struct.new(:ftype).new("fifo"))
+          expect(Ansi.__send__(:do_ansi?, io)).to be_truthy
+        end
+
+        it "returns false when TERM is not set appropriately" do
+          stub_const("RUBY_PLATFORM", "mingw")
+          expect(ENV).to receive(:[]).with("TERM").and_return(nil)
+          io = double
+          expect(Ansi.__send__(:do_ansi?, io)).to be_falsey
+        end
+      end
+
+      context "on POSIX" do
+        it "returns true when IO is a TTY" do
+          stub_const("RUBY_PLATFORM", "linux")
+          io = double
+          expect(io).to receive(:tty?).and_return(true)
+          expect(Ansi.__send__(:do_ansi?, io)).to be_truthy
+        end
+      end
+
+    end
+  end
+end

spec/rscons/environment_spec.rb

@@ -190,38 +190,6 @@ module Rscons
       end
     end
 
-    describe "#execute" do
-      context "with echo: :short" do
-        context "with no errors" do
-          it "prints the short description and executes the command" do
-            env = Environment.new(echo: :short)
-            expect(env).to receive(:puts).with("short desc")
-            expect(env).to receive(:system).with(*Rscons.command_executer, "a", "command").and_return(true)
-            env.execute("short desc", ["a", "command"])
-          end
-        end
-
-        context "with errors" do
-          it "prints the short description, executes the command, and prints the failed command line" do
-            env = Environment.new(echo: :short)
-            expect(env).to receive(:puts).with("short desc")
-            expect(env).to receive(:system).with(*Rscons.command_executer, "a", "command").and_return(false)
-            expect($stdout).to receive(:puts).with("Failed command was: a command")
-            env.execute("short desc", ["a", "command"])
-          end
-        end
-      end
-
-      context "with echo: :command" do
-        it "prints the command executed and executes the command" do
-          env = Environment.new(echo: :command)
-          expect(env).to receive(:puts).with("a command '--arg=val with spaces'")
-          expect(env).to receive(:system).with({modified: :environment}, *Rscons.command_executer, "a", "command", "--arg=val with spaces", {opt: :val}).and_return(false)
-          env.execute("short desc", ["a", "command", "--arg=val with spaces"], env: {modified: :environment}, options: {opt: :val})
-        end
-      end
-    end
-
     describe "#method_missing" do
       it "calls the original method missing when the target method is not a known builder" do
         env = Environment.new

spec/rscons/varset_spec.rb

@@ -199,5 +199,14 @@ module Rscons
       end
     end
 
+    describe "#values_at" do
+      it "returns an array of the values associated with the given keys" do
+        v = VarSet.new({"fuz" => "a string", "foo" => 42, "bar" => :baz,
+                        "qax" => [3, 6], "qux" => {a: :b}})
+        expect(v.values_at).to eq []
+        expect(v.values_at(*%w[fuz qux qax])).to eq ["a string", {a: :b}, [3, 6]]
+      end
+    end
+
   end
 end