Tests for Checksum class

Library/Homebrew/checksum.rb

@@ -1,22 +1,19 @@
 class Checksum
   attr_reader :hash_type, :hexdigest
+  alias_method :to_s, :hexdigest
 
   TYPES = [:sha1, :sha256]
 
-  def initialize type=:sha1, val=nil
-    @hash_type = type
-    @hexdigest = val.to_s
+  def initialize(hash_type, hexdigest)
+    @hash_type = hash_type
+    @hexdigest = hexdigest
   end
 
   def empty?
-    @hexdigest.empty?
+    hexdigest.empty?
   end
 
-  def to_s
-    @hexdigest
-  end
-
-  def == other
-    @hash_type == other.hash_type and @hexdigest == other.hexdigest
+  def ==(other)
+    hash_type == other.hash_type && hexdigest == other.hexdigest
   end
 end

Library/Homebrew/test/test_checksum.rb

@@ -0,0 +1,23 @@
+require 'testing_env'
+require 'checksum'
+
+class ChecksumTests < Test::Unit::TestCase
+  def test_empty?
+    assert_empty Checksum.new(:sha1, '')
+  end
+
+  def test_equality
+    a = Checksum.new(:sha1, 'deadbeef'*5)
+    b = Checksum.new(:sha1, 'deadbeef'*5)
+    assert_equal a, b
+
+    a = Checksum.new(:sha1, 'deadbeef'*5)
+    b = Checksum.new(:sha1, 'feedface'*5)
+    assert_not_equal a, b
+
+    a = Checksum.new(:sha1, 'deadbeef'*5)
+    b = Checksum.new(:sha256, 'deadbeef'*5)
+    assert_not_equal a, b
+  end
+end
+