run previous exemplar on current HEAD

.github/workflows/ci.yml

@@ -379,16 +379,18 @@ jobs:
           fetch-depth: 0
           fetch-tags: true
       - name: Get latest release tag
+        # TODO switch to: latest_release=$(git tag --sort=-v:refname | grep -v v1 | head -n 1)
         run: |
-          latest_release=$(git tag --sort=-v:refname | grep -v v1 | head -n 1)
+          latest_release=$(git rev-parse HEAD^)
           echo "Latest release: $latest_release"
           echo "LATEST_RELEASE=$latest_release" >> "$GITHUB_ENV"
-      - name: Checkout previous code
+      - name: Check out exemplar from previous release
         uses: actions/checkout@v4
         with:
           ref: ${{ env.LATEST_RELEASE }}
           fetch-depth: 0
           fetch-tags: true
+          sparse-checkout: exemplar
       - name: Init Hermit
         uses: cashapp/activate-hermit@v1
         with:

smoketest/exemplar_smoke_test.go

@@ -3,6 +3,7 @@
 package smoketest
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/alecthomas/assert/v2"
@@ -16,8 +17,10 @@ func TestSmokeEcho(t *testing.T) {
 		in.WithTestDataDir("."),
 		in.CopyModule("echo"),
 		in.Deploy("echo"),
-		in.Call("echo", "echo", "Bob", func(t testing.TB, response string) {
-			assert.Equal(t, "Hello, Bob!!!", response)
+		in.Call("echo", "echo", "Joe", func(t testing.TB, response string) {
+			name := "Joe"
+			fmt.Printf("name: %s\n", name)
+			assert.Equal(t, "Hello, %s!!!", name, response)
 		}),
 		in.Exec("ftl", "--version"),
 	)