test(verifier): cross-extractor read guard and named()

internal/verifier/extractor_guard_test.go

@@ -0,0 +1,34 @@
+package verifier
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestPushSnapshot_CrossExtractorReadIsGuarded(t *testing.T) {
+	verifier := newVerifier(t)
+	mustLoad(t, verifier, `
+const a = __sanderling__.extract(state => 1);
+const b = __sanderling__.extract(() => a.current);
+globalThis.a = a;
+globalThis.b = b;
+`)
+	err := verifier.PushSnapshot(SnapshotInput{Snapshots: Snapshots{}})
+	if err == nil {
+		t.Fatal("expected guard error, got nil")
+	}
+	if !strings.Contains(err.Error(), "inside another extractor is not allowed") {
+		t.Errorf("guard error wrong: %v", err)
+	}
+}
+
+func TestExtract_NamedSetsExtractorName(t *testing.T) {
+	verifier := newVerifier(t)
+	mustLoad(t, verifier, `
+const route = __sanderling__.extract(state => "home").named("route");
+globalThis.route = route;
+`)
+	if got := verifier.extractors[0].name; got != "route" {
+		t.Errorf("named() did not set name: got %q, want %q", got, "route")
+	}
+}