Update release documentation and fix test(#369)

* update release documentation

Co-authored-by: Michael Nikitochkin <michael.nikitochkin@shopify.com>

* remove link after metrics test

attempt to address race condition in tests that happens in CI

Co-authored-by: Michael Nikitochkin <michael.nikitochkin@shopify.com>

README.md

@@ -616,9 +616,6 @@ For example, `shopify_test_redis_master` or `shopify_development_mysql_1`.
 
 ### Release
 
-1. Update `CHANGELOG.md`
-1. Change versions in `README.md`
-1. Create a release commit and a signed tag.
-1. [Bump version for Homebrew](https://github.com/Shopify/homebrew-shopify/blob/master/toxiproxy.rb#L9)
+See [RELEASE.md](./RELEASE.md)
 
 [blog]: https://shopifyengineering.myshopify.com/blogs/engineering/building-and-testing-resilient-ruby-on-rails-applications

RELEASE.md

@@ -0,0 +1,77 @@
+# Releasing 
+
+- [Releasing](#releasing)
+  - [Before You Begin](#before-you-begin)
+  - [Local Release Preparation](#local-release-preparation)
+    - [Checkout latest code](#checkout-latest-code)
+    - [Update the CHANGELOG.md](#update-the-changelogmd)
+    - [Create Release Commit and Tag](#create-release-commit-and-tag)
+    - [Run Pre-Release Tests](#run-pre-release-tests)
+  - [Push Release Tag](#push-release-tag)
+  - [Verify Github Release](#verify-github-release)
+  - [Update Homebrew versions](#update-homebrew-versions)
+
+## Before You Begin
+
+Ensure your local workstation is configured to be able to [Sign commits](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)
+
+## Local Release Preparation
+
+### Checkout latest code
+
+```bash
+git checkout master
+git pull origin master
+```
+
+### Update the [CHANGELOG.md](CHANGELOG.md)
+
+- Add a new version header at the top of the document, just after `# [Unreleased]`
+- Update links at bottom of changelog
+
+### Create Release Commit and Tag
+
+```bash
+export RELEASE_VERSION=2.x.y
+git commit -a -S -m "Release $RELEASE_VERSION"
+git tag -s "v$RELEASE_VERSION" # When prompted for a commit message, enter the 'release notes' style message, just like on the releases page
+```
+
+### Run Pre-Release Tests
+
+```bash
+make test-release
+```
+
+- Push to Master Branch
+```bash
+git push origin master
+```
+
+## Push Release Tag
+
+- On your local machine again, push your tag to github
+
+```bash
+git push origin "v$RELEASE_VERSION"
+```
+
+## Verify Github Release
+
+- Github Actions should kick off a build and release after the tag is pushed.
+- Verify that a [Release gets created in Github](https://github.com/Shopify/toxiproxy/releases) and verify that the release notes look correct
+- Github Actions should also attatch the built binaries to the release (it might take a few mins)
+
+## Update Homebrew versions
+
+- Update [homebrew-shopify toxiproxy.rb](https://github.com/Shopify/homebrew-shopify/blob/master/toxiproxy.rb#L9) manifest
+  1. Update `app_version` string to your released version
+  2. Update hashes for all platforms (find the hashes in the checksums.txt from your release notes)
+
+- Do a manual check of installing toxiproxy via brew
+  1. While in the homebrew-shopify directory...
+  ```bash
+  brew install ./toxiproxy.rb --debug
+  ```
+  Note: it's normal to get some errors when homebrew attempts to load the file as a Cask instead of a formula, just make sure that it still gets installed.
+- PR the version update change and merge

metrics_test.go

@@ -30,7 +30,9 @@ func TestProxyMetricsReceivedSentBytes(t *testing.T) {
 	w := &testWriteCloser{
 		bufio.NewWriter(bytes.NewBuffer([]byte{})),
 	}
-	proxy.Toxics.StartLink(srv, "testupstream", r, w, stream.Upstream)
+	linkName := "testupstream"
+	proxy.Toxics.StartLink(srv, linkName, r, w, stream.Upstream)
+	proxy.Toxics.RemoveLink(linkName)
 	gotMetrics := prometheusOutput(t, srv, "toxiproxy")
 	if !reflect.DeepEqual(gotMetrics, expectedMetrics) {
 		t.Fatalf("expected: %v got: %v", expectedMetrics, gotMetrics)