Initial tests for superenv sanity

Library/Homebrew/test/test_superenv.rb

+require 'testing_env'
+require 'extend/ENV/super'
+
+class SuperenvTests < Test::Unit::TestCase
+  attr_reader :env, :bin
+
+  def setup
+    @env = {}.extend(Superenv)
+    @bin = HOMEBREW_REPOSITORY/"Library/ENV/#{MacOS::Xcode.version}"
+    bin.mkpath
+  end
+
+  def test_bin
+    assert_equal bin, Superenv.bin
+  end
+
+  def test_initializes_deps
+    assert_equal [], env.deps
+    assert_equal [], env.keg_only_deps
+  end
+
+  def teardown
+    bin.rmtree
+  end
+end