Restore SOURCE_DATE_EPOCH

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rubygems/test_gem_package.rb

@@ -105,6 +105,7 @@ class TestGemPackage < Gem::Package::TarTestCase
   end
 
   def test_build_time_source_date_epoch
+    epoch = ENV["SOURCE_DATE_EPOCH"]
     ENV["SOURCE_DATE_EPOCH"] = "123456789"
 
     spec = Gem::Specification.new 'build', '1'
@@ -118,6 +119,8 @@ class TestGemPackage < Gem::Package::TarTestCase
     package = Gem::Package.new spec.file_name
 
     assert_equal Time.at(ENV["SOURCE_DATE_EPOCH"].to_i).utc, package.build_time
+  ensure
+    ENV["SOURCE_DATE_EPOCH"] = epoch
   end
 
   def test_add_files

test/rubygems/test_gem_package_tar_writer.rb

@@ -11,9 +11,12 @@ class TestGemPackageTarWriter < Gem::Package::TarTestCase
     @data = 'abcde12345'
     @io = TempIO.new
     @tar_writer = Gem::Package::TarWriter.new @io
+    @epoch = ENV["SOURCE_DATE_EPOCH"]
+    ENV["SOURCE_DATE_EPOCH"] = nil
   end
 
   def teardown
+    ENV["SOURCE_DATE_EPOCH"] = @epoch
     @tar_writer.close unless @tar_writer.closed?
     @io.close!
 

test/rubygems/test_gem_specification.rb

@@ -1719,8 +1719,11 @@ dependencies: []
   end
 
   def test_date_use_env_source_date_epoch
+    epoch = ENV["SOURCE_DATE_EPOCH"]
     ENV["SOURCE_DATE_EPOCH"] = "123456789"
     assert_equal Time.utc(1973,11,29,0,0,0), @a1.date
+  ensure
+    ENV["SOURCE_DATE_EPOCH"] = epoch
   end
 
   def test_dependencies