Add tests for pouring bottle without Xcode

add testball_bottle formula for upcoming bottle unit testing, as well
as bottles directory containing test bottle (and symlinks)

Library/Homebrew/test/bottles/testball_bottle-0.1.mavericks.bottle.tar.gz

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+testball_bottle-0.1.yosemite.bottle.tar.gz

Library/Homebrew/test/bottles/testball_bottle-0.1.mountain_lion.bottle.tar.gz

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+testball_bottle-0.1.yosemite.bottle.tar.gz

Library/Homebrew/test/test_formula_installer_bottle.rb

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+require "testing_env"
+require "formula"
+require "compat/formula_specialties"
+require "formula_installer"
+require "keg"
+require "testball_bottle"
+require "testball"
+
+class InstallBottleTests < Homebrew::TestCase
+  def temporary_bottle_install(formula)
+    refute_predicate formula, :installed?
+    assert_predicate formula, :bottled?
+    assert_predicate formula, :pour_bottle?
+
+    installer = FormulaInstaller.new(formula)
+
+    shutup { installer.install }
+
+    keg = Keg.new(formula.prefix)
+
+    assert_predicate formula, :installed?
+
+    begin
+      yield formula
+    ensure
+      keg.unlink
+      keg.uninstall
+      formula.clear_cache
+      Dir["#{HOMEBREW_CACHE}/testball_bottle*"].each { |f| File.delete(f) }
+      # there will be log files when sandbox is enable.
+      formula.logs.rmtree if formula.logs.directory?
+    end
+
+    refute_predicate keg, :exist?
+    refute_predicate formula, :installed?
+  end
+
+  def test_a_basic_bottle_install
+    MacOS.stubs(:has_apple_developer_tools?).returns(false)
+
+    temporary_bottle_install(TestballBottle.new) do |f|
+      # Copied directly from test_formula_installer.rb as we expect
+      # the same behavior
+
+      # Test that things made it into the Keg
+      assert_predicate f.bin, :directory?
+
+      assert_predicate f.libexec, :directory?
+
+      refute_predicate f.prefix+"main.c", :exist?
+
+      # Test that things make it into the Cellar
+      keg = Keg.new f.prefix
+      keg.link
+
+      bin = HOMEBREW_PREFIX+"bin"
+      assert_predicate bin, :directory?
+    end
+  end
+
+  def test_build_tools_error
+    MacOS.stubs(:has_apple_developer_tools?).returns(false)
+
+    # Testball doesn't have a bottle block, so use it to test this behavior
+    formula = Testball.new
+
+    refute_predicate formula, :installed?
+    refute_predicate formula, :bottled?
+
+    installer = FormulaInstaller.new(formula)
+
+    assert_raises(BuildToolsError) do
+        installer.install
+    end
+
+    refute_predicate formula, :installed?
+  end
+end

Library/Homebrew/test/testball_bottle.rb

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+class TestballBottle < Formula
+  def initialize(name = "testball_bottle", path = Pathname.new(__FILE__).expand_path, spec = :stable)
+    self.class.instance_eval do
+      stable.url "file://#{File.expand_path("..", __FILE__)}/tarballs/testball-0.1.tbz"
+      stable.sha256 "1dfb13ce0f6143fe675b525fc9e168adb2215c5d5965c9f57306bb993170914f"
+      stable.bottle do
+        cellar :any_skip_relocation
+        root_url "file://#{File.expand_path("..", __FILE__)}/bottles"
+        sha256 "9abc8ce779067e26556002c4ca6b9427b9874d25f0cafa7028e05b5c5c410cb4" => :yosemite
+        sha256 "9abc8ce779067e26556002c4ca6b9427b9874d25f0cafa7028e05b5c5c410cb4" => :mavericks
+        sha256 "9abc8ce779067e26556002c4ca6b9427b9874d25f0cafa7028e05b5c5c410cb4" => :mountain_lion
+      end
+      cxxstdlib_check :skip
+    end
+    super
+  end
+end