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# frozen_string_literal: true
require "abstract_unit"
require "active_support/core_ext/file"
class AtomicWriteTest < ActiveSupport::TestCase
def test_atomic_write_without_errors
contents = "Atomic Text"
File.atomic_write(file_name, Dir.pwd) do |file|
file.write(contents)
assert_not File.exist?(file_name)
end
assert File.exist?(file_name)
assert_equal contents, File.read(file_name)
ensure
File.unlink(file_name) rescue nil
end
def test_atomic_write_doesnt_write_when_block_raises
File.atomic_write(file_name) do |file|
file.write("testing")
raise "something bad"
end
rescue
assert_not File.exist?(file_name)
end
def test_atomic_write_preserves_file_permissions
contents = "Atomic Text"
File.open(file_name, "w", 0755) do |file|
file.write(contents)
assert File.exist?(file_name)
end
assert File.exist?(file_name)
assert_equal 0100755 & ~File.umask, file_mode
assert_equal contents, File.read(file_name)
File.atomic_write(file_name, Dir.pwd) do |file|
file.write(contents)
assert File.exist?(file_name)
end
assert File.exist?(file_name)
assert_equal 0100755 & ~File.umask, file_mode
assert_equal contents, File.read(file_name)
ensure
File.unlink(file_name) rescue nil
end
def test_atomic_write_preserves_default_file_permissions
contents = "Atomic Text"
File.atomic_write(file_name, Dir.pwd) do |file|
file.write(contents)
assert_not File.exist?(file_name)
end
assert File.exist?(file_name)
assert_equal File.probe_stat_in(Dir.pwd).mode, file_mode
assert_equal contents, File.read(file_name)
ensure
File.unlink(file_name) rescue nil
end
def test_atomic_write_returns_result_from_yielded_block
block_return_value = File.atomic_write(file_name, Dir.pwd) do |file|
"Hello world!"
end
assert_equal "Hello world!", block_return_value
ensure
File.unlink(file_name) rescue nil
end
private
def file_name
"atomic.file"
end
def file_mode
File.stat(file_name).mode
end
end
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