From fe10fc708e070234d89714576704607b7d9216dc Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Thu, 17 Aug 2023 12:16:49 -0700
Subject: [PATCH] Improve CI baseline check (#55418)

---
 .github/workflows/ci.yml | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e35bd060e63..a34b158ea08 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -240,7 +240,7 @@ jobs:
       - name: Self build
         run: npx hereby build-src --built
 
-  unused-baselines:
+  baselines:
     runs-on: ubuntu-latest
 
     steps:
@@ -258,11 +258,22 @@ jobs:
         run: npm test &> /dev/null || exit 0
 
       - name: Accept baselines
-        run: npx hereby baseline-accept
-
-      - name: Check for unused baselines
         run: |
-          if ! git diff --exit-code --quiet; then
-            echo "Unused baselines:"
-            git diff --exit-code --name-only
+          npx hereby baseline-accept
+          git add tests/baselines/reference
+
+      - name: Check baselines
+        run: |
+          function print_diff() {
+            if ! git diff --staged --exit-code --quiet --diff-filter=$1; then
+              echo "$2:"
+              git diff --staged --name-only --diff-filter=$1
+            fi
+          }
+
+          if ! git diff --staged --exit-code --quiet; then
+            print_diff ACR "Missing baselines"
+            print_diff MTUXB "Modified baselines"
+            print_diff D "Unused baselines"
+            exit 1
           fi