Fix asset provisioning to strip embedded share/radiantwave root

internal/assets/assets_test.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"testing/fstest"
 )
 
 //go:embed testdata
@@ -38,6 +39,40 @@ func TestProvisionCopiesBundledFiles(t *testing.T) {
 	}
 }
 
+// TestProvisionAssetsStripsEmbeddedRoot is a regression test: provisioning
+// used to preserve the embedded share/radiantwave root, so assets landed in
+// <dataDir>/share/radiantwave/fonts instead of <dataDir>/fonts. ProvisionAssets
+// strips that root so consumers find the assets directly under the assets dir.
+func TestProvisionAssetsStripsEmbeddedRoot(t *testing.T) {
+	fsys := fstest.MapFS{
+		"share/radiantwave/fonts/TestFont.ttf":    &fstest.MapFile{Data: []byte("font")},
+		"share/radiantwave/shaders/text.frag":     &fstest.MapFile{Data: []byte("frag")},
+		"share/radiantwave/shaders/text.vert":     &fstest.MapFile{Data: []byte("vert")},
+		"share/radiantwave/tos/01 - WELCOME.html": &fstest.MapFile{Data: []byte("welcome")},
+	}
+	dest := t.TempDir()
+
+	if err := ProvisionAssets(fsys, dest); err != nil {
+		t.Fatalf("ProvisionAssets returned error: %v", err)
+	}
+
+	// Assets must land directly under dest, not under dest/share/radiantwave.
+	for _, rel := range []string{
+		"fonts/TestFont.ttf",
+		"shaders/text.frag",
+		"shaders/text.vert",
+		"tos/01 - WELCOME.html",
+	} {
+		if _, err := os.Stat(filepath.Join(dest, filepath.FromSlash(rel))); err != nil {
+			t.Errorf("expected %s to be provisioned directly under dest: %v", rel, err)
+		}
+	}
+
+	if _, err := os.Stat(filepath.Join(dest, "share")); !os.IsNotExist(err) {
+		t.Errorf("unexpected share/ directory created under dest: %v", err)
+	}
+}
+
 func TestProvisionOverwritesStaleFiles(t *testing.T) {
 	dest := t.TempDir()