Add header initialization tests.

test/helper.rb

@@ -0,0 +1,4 @@
+require 'test/unit'
+require 'simple_oauth'
+require 'rubygems'
+require 'mocha'

test/simple_oauth_test.rb

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+require 'helper'
+
+class SimpleOAuthTest < Test::Unit::TestCase
+  def test_initialization_argument_formatting
+    header = SimpleOAuth::Header.new(:get, 'HTTPS://api.TWITTER.com:443/statuses/friendships.json#anchor', {})
+
+    # HTTP method should be an uppercase string.
+    #
+    # See: http://oauth.net/core/1.0/#rfc.section.9.1.3
+    assert_equal 'GET', header.method
+
+    # Request URL should downcase the scheme and authority parts as well as
+    # remove the query and fragment parts.
+    #
+    # See: http://oauth.net/core/1.0/#rfc.section.9.1.2
+    assert_equal 'https://api.twitter.com/statuses/friendships.json', header.url
+  end
+
+  def test_default_options
+    # Default header options should change with each call due to generation of
+    # a unique "timestamp" and "nonce" value combination.
+    default_options = SimpleOAuth::Header.default_options
+    assert_not_equal default_options, SimpleOAuth::Header.default_options
+
+    SimpleOAuth::Header.stubs(:default_options).returns(default_options)
+    header = SimpleOAuth::Header.new(:get, 'https://api.twitter.com/statuses/friendships.json', {})
+
+    # Given no options argument, header options defer to the default options.
+    assert_equal default_options, header.options
+
+    # Default options should include a signature method and the OAuth version.
+    assert_equal 'HMAC-SHA1', default_options[:signature_method]
+    assert_equal '1.0', default_options[:version]
+  end
+end