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Not sure why the test failed to find the homebrew/core formula 🤔 I can validate it's there:

$ brew info fnm
fnm: stable 1.22.2 (bottled), HEAD
Fast and simple Node.js version manager
https://fnm.vercel.app
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/fnm.rb
License: GPL-3.0-only
==> Dependencies
Build: rust ✘
==> Options
--HEAD
	Install HEAD version
==> Analytics
install: 13 (30 days), 13 (90 days), 37 (365 days)
install-on-request: 13 (30 days), 13 (90 days), 37 (365 days)
build-error: 0 (30 days)

Perhaps a re-run could validate that it indeed exists in homebrew/core?

@Schniz, this time, it worked for fish, macos but not bash, macos. Only fish, macos was run the first time, because when it failed the other ones were skipped. There's got to be some caching happening in the background, which is making Homebrew not find the formula and fail the first time 🤔

I wonder if we should add a step (only for MacOS) that does brew update before installing. We already do brew install SHELL, we can turn it into a multiline expression and stick a brew update before that

I wonder if we should add a step (only for MacOS) that does brew update before installing. We already do brew install SHELL, we can turn it into a multiline expression and stick a brew update before that

That sounds like a potential solution. I like it 🙂 I'll make the following change:

diff --git a/.github/workflows/installation_script.yml b/.github/workflows/installation_script.yml
index 1945731..a079e25 100644
--- a/.github/workflows/installation_script.yml
+++ b/.github/workflows/installation_script.yml
@@ -66,8 +66,8 @@ jobs:
       - run: "sudo apt-get install -y ${{ matrix.shell }}"
         name: Install ${{matrix.shell}} using apt-get
         if: matrix.setup.os == 'ubuntu'
-      - run: "brew install ${{ matrix.shell }}"
-        name: Install ${{matrix.shell}} using Homebrew
+      - run: "brew update && brew install ${{ matrix.shell }}"
+        name: Update formulae and install ${{matrix.shell}} using Homebrew
         if: matrix.setup.os == 'macos'
       - run: |
           if [ -f ~/.bashrc ]; then

@Schniz, it worked 😋 👍 Thanks for the recommendation!