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-rw-r--r--test/rubygems/test_gem_commands_build_command.rb32
1 files changed, 32 insertions, 0 deletions
diff --git a/test/rubygems/test_gem_commands_build_command.rb b/test/rubygems/test_gem_commands_build_command.rb
index 0c511b2f085..50c447e2ebf 100644
--- a/test/rubygems/test_gem_commands_build_command.rb
+++ b/test/rubygems/test_gem_commands_build_command.rb
@@ -457,4 +457,36 @@ class TestGemCommandsBuildCommand < Gem::TestCase
assert_match(/INFO: Your expired cert will be located at: .+\Wgem-public_cert\.pem\.expired\.[0-9]+/, output.shift)
end
+ def test_build_is_reproducible
+ epoch = ENV["SOURCE_DATE_EPOCH"]
+ new_epoch = Time.now.to_i.to_s
+ ENV["SOURCE_DATE_EPOCH"] = new_epoch
+
+ gem_file = File.basename(@gem.cache_file)
+
+ gemspec_file = File.join(@tempdir, @gem.spec_name)
+ File.write(gemspec_file, @gem.to_ruby)
+ @cmd.options[:args] = [gemspec_file]
+
+ util_test_build_gem @gem
+
+ build1_contents = File.read(gem_file)
+
+ # Guarantee the time has changed.
+ sleep 1 if Time.now.to_i == new_epoch
+
+ ENV["SOURCE_DATE_EPOCH"] = new_epoch
+
+ @ui = Gem::MockGemUi.new
+ @cmd.options[:args] = [gemspec_file]
+
+ util_test_build_gem @gem
+
+ build2_contents = File.read(gem_file)
+
+ assert_equal build1_contents, build2_contents
+ ensure
+ ENV["SOURCE_DATE_EPOCH"] = epoch
+ end
+
end