ci: Add test job for -Zminimal-versions

Fixes #362

Author: Techcable

.github/workflows/test.yml

@@ -79,6 +79,9 @@ jobs:
           toolchain: ${{ matrix.rust }}
       - uses: Swatinem/rust-cache@v2
         if: ${{ matrix.rust != 'nightly' }} # ineffective due to version key
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-minimal-versions,cargo-hack
       - name: Check
         run: |
           cargo check --all-targets --verbose --no-default-features --features "${{ matrix.features }}"
@@ -94,6 +97,9 @@ jobs:
         # However, we can grant special exceptions for the Minimum Supported Rust Version
         # if there is a really good reason (like a dependency that requires a newer version).
         continue-on-error: false
+      - name: Test (-Zminimal-versions)
+        run:
+          cargo minimal-versions test --all --verbose --no-default-features "${{ matrix.features }}"
       - name: rustdoc
         # Restrict to working on nightly/stable (old versions might have undefined types)
         if: ${{ matrix.rust == 'nightly' || matrix.rust == 'stable' }}

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Fixes
+* ci: Check the tests pass with `-Zminimal-versions`
+
 ## 2.8.1 - 2025-10-05
 This fixes an accidental breaking change in the v2.8.0 release,
 where the public API was changed from `erased_serde v0.4` to `erased_serde v0.3`.
@@ -21,7 +24,6 @@ I (@Techcable) apologize for this breakage and have yanked the 2.8.0 release due
     future version, but will be done so in a backwards compatible way.
   - Thanks to @demurgos for recognizing and fixing this in PR #359
 - Ensure compatibility with `-Zminimal-versions` flag by specifying minimal dependency versions (fixes #357)
-  - Not (yet) tested in CI
 
 ## [2.8.0] - 2025-10-05
 This is the biggest slog release since 2.0. It fully preserves compatibility with prior releases.