Fix activesupport atomic_write tests when Dir.tmpdir is on another partition. Closes #8573 [tpope]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7412 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/test/core_ext/file_test.rb

@@ -4,14 +4,14 @@ class AtomicWriteTest < Test::Unit::TestCase
   
   def test_atomic_write_without_errors
     contents  = "Atomic Text"
-    File.atomic_write(file_name) do |file|
+    File.atomic_write(file_name, Dir.pwd) do |file|
       file.write(contents)
       assert !File.exists?(file_name)
     end
     assert File.exists?(file_name)
     assert_equal contents, File.read(file_name)
   ensure
-    File.unlink(file_name)
+    File.unlink(file_name) rescue nil
   end
   
   def test_atomic_write_doesnt_write_when_block_raises