test(verifier): one spec bundler instead of four

The four differed only in which rows of the alias map they omitted, and esbuild
applies an alias only on an actual import, so the omissions were not a
difference. One bundleSpec carries what genuinely varied: an inline spec or a
path on disk, and an optional runtime entry to swap for the shipped one.

internal/verifier/action_encoding_test.go

@@ -1,14 +1,14 @@
 package verifier
 
 import (
-	"os"
-	"path/filepath"
 	"strings"
 	"testing"
-
-	"github.com/priyanshujain/sanderling/internal/bundler"
 )
 
+// The picker under test comes from the runtime entry, so the spec beside it
+// only has to satisfy Load's demand for a properties global.
+const propertiesOnlySpec = "globalThis.properties = {};\n"
+
 // legacyRuntimeEntry stands in for the @sanderling/spec 0.0.3 runtime entry:
 // it installs the picker and declares nothing, and its authored Scroll carries
 // the container's own point as both endpoints. Paired with a binary that
@@ -33,28 +33,13 @@ Object.defineProperty(target, "__sanderlingNextAction__", {
 });
 `
 
-func bundleWithRuntimeEntry(t *testing.T, runtimeSource string) string {
-	t.Helper()
-	dir := t.TempDir()
-	specPath := filepath.Join(dir, "spec.ts")
-	if err := os.WriteFile(specPath, []byte("globalThis.properties = {};\n"), 0o600); err != nil {
-		t.Fatal(err)
-	}
-	runtimePath := filepath.Join(dir, "legacy-runtime.ts")
-	if err := os.WriteFile(runtimePath, []byte(runtimeSource), 0o600); err != nil {
-		t.Fatal(err)
-	}
-	bundle, err := bundler.Bundle(bundler.Options{EntryFile: specPath, RuntimeFile: runtimePath})
-	if err != nil {
-		t.Fatal(err)
-	}
-	return string(bundle.JavaScript)
-}
-
 func TestLoad_RefusesABundleThatDeclaresNoActionEncoding(t *testing.T) {
 	verifier := newVerifier(t)
 
-	err := verifier.Load(bundleWithRuntimeEntry(t, legacyRuntimeEntry))
+	err := verifier.Load(bundleSpec(t, bundleOptions{
+		SpecSource:    propertiesOnlySpec,
+		RuntimeSource: legacyRuntimeEntry,
+	}))
 	if err == nil {
 		t.Fatal("Load accepted a bundle that declares no action encoding; a spec " +
 			"bundled by a package older than this binary dispatches every scroll " +
@@ -76,7 +61,10 @@ func TestLoad_RefusesABundleThatDeclaresADifferentActionEncoding(t *testing.T) {
 		`const target = globalThis as Record<string, unknown>;
 target.__sanderlingActionEncoding__ = "action-wire/1";`, 1)
 
-	err := verifier.Load(bundleWithRuntimeEntry(t, runtime))
+	err := verifier.Load(bundleSpec(t, bundleOptions{
+		SpecSource:    propertiesOnlySpec,
+		RuntimeSource: runtime,
+	}))
 	if err == nil {
 		t.Fatal("Load accepted a bundle built against a different action encoding")
 	}
@@ -119,7 +107,11 @@ target.__sanderlingBundleCheck__ = true;
 func TestLoad_AcceptsABundleThatInstallsNoPicker(t *testing.T) {
 	verifier := newVerifier(t)
 
-	if err := verifier.Load(bundleWithRuntimeEntry(t, pickerFreeRuntimeEntry)); err != nil {
+	bundle := bundleSpec(t, bundleOptions{
+		SpecSource:    propertiesOnlySpec,
+		RuntimeSource: pickerFreeRuntimeEntry,
+	})
+	if err := verifier.Load(bundle); err != nil {
 		t.Fatalf("Load refused a bundle that generates no actions: %v", err)
 	}
 }