homebrew groonga.rb: enable mruby support and add tests.

groonga.rb.diff

diff --git a/Library/Formula/groonga.rb b/Library/Formula/groonga.rb
index 386e7ca..94e0a41 100644
--- a/Library/Formula/groonga.rb
+++ b/Library/Formula/groonga.rb
@@ -39,7 +39,7 @@ class Groonga < Formula
       --prefix=#{prefix}
       --with-zlib
       --disable-zeromq
-      --with-mruby
+      --enable-mruby
       --without-libstemmer
     ]
 
@@ -52,6 +52,20 @@ class Groonga < Formula
     system "make"
     system "make install"
   end
+
+  test do
+    system %q{groonga -n test.db status | grep -q '^\[\[0,'}
+    system %q{printf 'register "ruby/eval"\nruby_eval "p :OK"\n' | groonga test.db | grep -q '^:OK'}
+
+    if build.with? "mecab"
+      system %q{printf 'tokenizer_list\n' | groonga test.db | grep -q TokenMecab}
+    end
+
+    if build.with? "lz4"
+      system %q{printf 'table_create Entries TABLE_HASH_KEY ShortText\n' | groonga test.db}
+      system %q{printf 'column_create Entries content COLUMN_SCALAR|COMPRESS_LZ4 Text\n' | groonga test.db}
+    end
+  end
 end