Eliminate nil check on path parameter

Library/Homebrew/formula.rb

@@ -30,10 +30,9 @@ class Formula
   attr_reader :cxxstdlib
 
   # Homebrew determines the name
-  def initialize name='__UNKNOWN__', path=nil
+  def initialize name='__UNKNOWN__', path=self.class.path(name)
     @name = name
-    # If we got an explicit path, use that, else determine from the name
-    @path = path.nil? ? self.class.path(name) : path
+    @path = path
     @homepage = self.class.homepage
 
     set_spec :stable

Library/Homebrew/test/test_formula.rb

@@ -4,6 +4,20 @@ require 'test/testball'
 class FormulaTests < Test::Unit::TestCase
   include VersionAssertions
 
+  def test_formula_path_initialization
+    name = "formula_name"
+    klass = Class.new(Formula) { url "http://example.com/foo-1.0.tar.gz" }
+
+    f = klass.new(name)
+    assert_equal Formula.path(name), f.path
+
+    f = klass.new(name, path = Object.new)
+    assert_equal path, f.path
+
+    f = klass.new(name, nil)
+    assert_nil f.path
+  end
+
   def test_prefix
     f = TestBall.new
     assert_equal HOMEBREW_CELLAR/f.name/'0.1', f.prefix