feat: Experimental subcommand-based interface (via @ok-nick)

.github/workflows/ci.yml

@@ -37,9 +37,21 @@ jobs:
         uses: taiki-e/install-action@cargo-llvm-cov
 
       - name: Generate code coverage
+        id: run_tests
         env:
-          RUST_BACKTRACE: "1"
-        run: cargo llvm-cov --bins --all-features --lcov --output-path lcov.info
+          RUST_BACKTRACE: 1
+          CARGO_TERM_COLOR: always
+          CLICOLOR_FORCE: 1
+          INSTA_UPDATE: new
+        run: cargo llvm-cov --tests --bins --all-features --lcov --output-path lcov.info
+
+      # https://insta.rs/docs/patterns/
+      - name: Upload snapshots of failed tests
+        if: ${{ failure() && steps.run_tests.outcome == 'failure' }}
+        uses: actions/upload-artifact@v3
+        with:
+          name: failed-snapshots
+          path: "**/snapshots/*.snap.new"
 
       - name: Upload code coverage results
         uses: codecov/codecov-action@v3