Convert `brew options` test to spec.

Library/Homebrew/test/cmd/options_spec.rb

+describe "brew options", :integration_test do
+  it "prints a given Formula's options" do
+    setup_test_formula "testball", <<-EOS.undent
+      depends_on "bar" => :recommended
+    EOS
+
+    expect { brew "options", "testball" }
+      .to output("--with-foo\n\tBuild with foo\n--without-bar\n\tBuild without bar support\n\n").to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+  end
+end

Library/Homebrew/test/options_test.rb

 require "testing_env"
 require "options"
-require "testing_env"
-
-class IntegrationCommandTestOptions < IntegrationCommandTestCase
-  def test_options
-    setup_test_formula "testball", <<-EOS.undent
-      depends_on "bar" => :recommended
-    EOS
-
-    assert_equal "--with-foo\n\tBuild with foo\n--without-bar\n\tBuild without bar support",
-      cmd("options", "testball").chomp
-  end
-end
 
 class OptionTests < Homebrew::TestCase
   def setup