Add tests for the most common use cases

Rakefile

@@ -1,5 +1,6 @@
 require 'rake/gempackagetask'
 require 'rake/extensiontask'
+require 'rake/testtask'
 
 $:.unshift File.join(File.dirname(__FILE__), 'lib')
 require 'redis_ext/version'
@@ -59,3 +60,9 @@ Rake::Task[:clean].enhance(['hiredis:clean'])
 
 # Build from scratch
 task :build => [:clean, :compile]
+
+desc "Run tests"
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.pattern = 'test/**/*_test.rb'
+end

test/reader_test.rb

@@ -0,0 +1,59 @@
+require 'test/unit'
+require 'redis_ext'
+
+class ReaderTest < Test::Unit::TestCase
+  def setup
+    @reader = RedisExt::Reader.new
+  end
+
+  def test_nil
+    @reader.feed("$-1\r\n")
+    assert_equal nil, @reader.gets
+  end
+
+  def test_integer
+    value = 2**63-1 # largest 64-bit signed integer
+    @reader.feed(":#{value.to_s}\r\n")
+    assert_equal value, @reader.gets
+  end
+
+  def test_status_string
+    @reader.feed("+status\r\n")
+    assert_equal "status", @reader.gets
+  end
+
+  def test_error_string
+    @reader.feed("-error\r\n")
+    assert_equal "error", @reader.gets
+  end
+
+  def test_empty_bulk_string
+    @reader.feed("$0\r\n\r\n")
+    assert_equal "", @reader.gets
+  end
+
+  def test_bulk_string
+    @reader.feed("$5\r\nhello\r\n")
+    assert_equal "hello", @reader.gets
+  end
+
+  def test_null_multi_bulk
+    @reader.feed("*-1\r\n")
+    assert_equal nil, @reader.gets
+  end
+
+  def test_empty_multi_bulk
+    @reader.feed("*0\r\n")
+    assert_equal [], @reader.gets
+  end
+
+  def test_multi_bulk
+    @reader.feed("*2\r\n$5\r\nhello\r\n$5\r\nworld\r\n")
+    assert_equal ["hello", "world"], @reader.gets
+  end
+
+  def test_nested_multi_bulk
+    @reader.feed("*2\r\n*2\r\n$5\r\nhello\r\n$5\r\nworld\r\n$1\r\n!\r\n")
+    assert_equal [["hello", "world"], "!"], @reader.gets
+  end
+end