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# frozen_string_literal: true
require "helper"
class TestGemPlatform < Nokogiri::TestCase
# These tests were written to help me better understand the behavior
# of Rubygems's platform-matching behavior. They don't exercise code
# in Nokogiri, but do express the expectations we have of Rubygems
# and `gem install` behavior for our native darwin gem.
#
# More specifically, the grpc gem ships a native darwin gem with
# platform string `universal-darwin` which I *think* refers to the
# fact that it supports i386-and-x86_64 architectures (and not that
# it supports x86_64-and-arm64 architectures).
#
# With ARM support imminent [1] I'm a little worried about using
# `universal` until I understand better whether ARM support will be
# implied by `universal` or `universal2` or what. From
# https://en.wikipedia.org/wiki/Universal_binary:
#
# > The new Universal 2 binary format was introduced at the 2020
# > Worldwide Developers Conference. Universal 2 allows applications
# > to run on both Intel x86-64-based and ARM64-based Macintosh
# > computers, for the Mac transition to Apple Silicon.
#
# [1]: https://arstechnica.com/gadgets/2020/06/this-is-apples-roadmap-for-moving-the-first-macs-away-from-intel/
#
# There seems to be a lot of uncertainty right now, so I'm writing
# some tests to express my expectations, and we're gonig to
# conservatively use `x86_64-darwin` as the platform name for the
# native gem.
let(:darwin_gem_platform) { Gem::Platform.new("x86_64-darwin") }
describe "darwin" do
it "builds a gem that works on all darwin x86+64 platforms" do
assert_match darwin_gem_platform,
Gem::Platform.new(["universal", "darwin", "19"]),
"gem should match system-installed ruby on catalina"
assert_match darwin_gem_platform,
Gem::Platform.new(["x86_64", "darwin", "19"]),
"gem should match user-installed ruby on catalina"
assert_match darwin_gem_platform,
Gem::Platform.new(["x86_64", "darwin", "18"]),
"gem should match user-installed ruby on mojave"
# The intention here is to test that the x86_64 platform gems
# won't match a future ruby that is compiled on arm64/aarch64.
#
# I don't know what the future platform will call itself, but at
# least one of these should be right and none of them should
# match, so here are all the tests I can reasonably imagine.
#
# Feel free to delete assertions for clarity once we know more.
refute_match darwin_gem_platform,
Gem::Platform.new(["arm64", "darwin", "19"]),
"gem should not match an arm64 ruby"
refute_match darwin_gem_platform,
Gem::Platform.new(["arm", "darwin", "19"]),
"gem should not match an arm ruby"
refute_match darwin_gem_platform,
Gem::Platform.new(["aarch64", "darwin", "19"]),
"gem should not match an aarch64 ruby"
refute_match darwin_gem_platform,
Gem::Platform.new(["universal2", "darwin", "19"]),
"gem should not match an aarch64 ruby"
refute_match darwin_gem_platform,
Gem::Platform.new(["universal_2", "darwin", "19"]),
"gem should not match an aarch64 ruby"
end
end
end
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