From 27d87b71cfdaec93a48a2dc00f8735ce83588d27 Mon Sep 17 00:00:00 2001
From: Kenny Kerr <kenny@kennykerr.ca>
Date: Tue, 19 Mar 2024 13:16:52 -0500
Subject: [PATCH] Add diff check after workflow test run (#2940)

---
 .github/workflows/test.yml   | 11 ++++++++---
 crates/tools/yml/src/main.rs | 17 +++++++++++++++--
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 01c49cb8af..e63cf341c3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,8 +35,8 @@ jobs:
         run: rustup update --no-self-update ${{ matrix.version }} && rustup default ${{ matrix.version }}-${{ matrix.target }}
       - name: Add toolchain target
         run: rustup target add ${{ matrix.target }}
-      - name: Install clippy
-        run: rustup component add clippy
+      - name: Install fmt
+        run: rustup component add rustfmt
       - name: Fix environment
         uses: ./.github/actions/fix-environment
       - name: Test
@@ -175,4 +175,9 @@ jobs:
           cargo test -p windows_i686_msvc &&
           cargo test -p windows_x86_64_gnu &&
           cargo test -p windows_x86_64_gnullvm &&
-          cargo test -p windows_x86_64_msvc
\ No newline at end of file
+          cargo test -p windows_x86_64_msvc
+      - name: Check diff
+        shell: bash
+        run: |
+          git add -N .
+          git diff --exit-code || (echo 'Tests changed code in the repo.'; exit 1)
diff --git a/crates/tools/yml/src/main.rs b/crates/tools/yml/src/main.rs
index e2808ada72..9ce637d75f 100644
--- a/crates/tools/yml/src/main.rs
+++ b/crates/tools/yml/src/main.rs
@@ -43,8 +43,8 @@ jobs:
         run: rustup update --no-self-update ${{ matrix.version }} && rustup default ${{ matrix.version }}-${{ matrix.target }}
       - name: Add toolchain target
         run: rustup target add ${{ matrix.target }}
-      - name: Install clippy
-        run: rustup component add clippy
+      - name: Install fmt
+        run: rustup component add rustfmt
       - name: Fix environment
         uses: ./.github/actions/fix-environment
       - name: Test
@@ -65,6 +65,19 @@ jobs:
     }
 
     yml.truncate(yml.len() - 3);
+
+    write!(
+        &mut yml,
+        r"
+      - name: Check diff
+        shell: bash
+        run: |
+          git add -N .
+          git diff --exit-code || (echo 'Tests changed code in the repo.'; exit 1)
+"
+    )
+    .unwrap();
+
     std::fs::write(".github/workflows/test.yml", yml.as_bytes()).unwrap();
 }