spec/rmega/lib/utils_spec.rb in rmega-0.0.2 vs spec/rmega/lib/utils_spec.rb in rmega-0.0.3

@@ -1,9 +1,15 @@
 # encoding: utf-8
 require 'spec_helper'
 
 describe Rmega::Utils do
+  def random_a32_array
+    a32_ary = []
+    rand(0..20).times { |len| a32_ary << rand(0..2**31)*(rand(2).zero? ? 1 : -1) }
+    a32_ary
+  end
+
   describe '#str_to_a32' do
     it 'returns the expected value' do
       string = 'johnsnow'
       a32 = [1785686126, 1936617335]
       described_class.str_to_a32(string).should == a32
@@ -14,14 +20,32 @@
       a32 = [1936355170, 1933599088, 1886151982, 1668246784]
       described_class.str_to_a32(string).should == a32
     end
   end
 
+  describe '#format_bytes' do
+    it 'converts to the correct unit' do
+      described_class.format_bytes(1024, 2).should == '1.0kb'
+      described_class.format_bytes(1024**2).should == '1.0MB'
+    end
+  end
+
   describe '#a32_to_str' do
     it 'returns the expected value' do
       a32 = [1953853537, 1660944384]
       string = "tupac" + "\x00\x00\x00"
       described_class.a32_to_str(a32).should == string
+    end
+
+    it 'is the opposite of #str_to_a32' do
+      a32_ary = random_a32_array
+      str = described_class.a32_to_str a32_ary
+      described_class.str_to_a32(str).should == a32_ary
+    end
+
+    it 'has the same result if len is multiplied by 4' do
+      a32 = random_a32_array
+      described_class.a32_to_str(a32).should == described_class.a32_to_str(a32, a32.size*4)
     end
   end
 
   describe '#base64urlencode' do
     it 'returns the expected value' do