Added spec & slightly different snappy check

Rakefile

@@ -2,7 +2,7 @@ require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new("spec:unit") do |t|
-  t.pattern = 'spec/unit/*_spec.rb'
+  t.pattern = 'spec/unit/**/*_spec.rb'
 end
 
 RSpec::Core::RakeTask.new('spec:integration:simple') do |t|

lib/poseidon/compression/snappy_codec.rb

@@ -17,8 +17,10 @@ def self.decompress(s)
 
       def self.check!
         @checked ||= begin
-          raise "Snappy compression is not available, please install the 'snappy' gem"
+          require 'snappy'
           true
+        rescue LoadError
+          raise "Snappy compression is not available, please install the 'snappy' gem"
         end
       end
 

spec/unit/compression/snappy_codec_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+describe Poseidon::Compression::SnappyCodec do
+
+  let :data do
+    %({"a":"val1"}\n{"a":"val2"}\n{"a":"val3"})
+  end
+
+  it "should have an ID" do
+    expect(described_class.codec_id).to eq(2)
+  end
+
+  it "should compress" do
+    compressed = described_class.compress(data)
+    expect(compressed.size).to eq(34)
+    expect(compressed.encoding).to eq(Encoding::BINARY)
+  end
+
+  it "should decompress" do
+    original = described_class.decompress(described_class.compress(data))
+    expect(original).to eq(data)
+  end
+end