diff --git a/cmd/pkgserver/ui/static/test.ts b/cmd/pkgserver/ui/static/test.ts
index 5de9bff5..b3b83742 100644
--- a/cmd/pkgserver/ui/static/test.ts
+++ b/cmd/pkgserver/ui/static/test.ts
@@ -8,6 +8,7 @@ export interface TestResult {
 
 export interface Reporter {
     update(path: string[], result: TestResult): void;
+    finalize(): void;
 }
 
 export interface Stream {
@@ -40,7 +41,7 @@ export class StreamReporter implements Reporter {
         }
     }
 
-    display() {
+    finalize() {
         // Transform [{ path: ['a', 'b', 'c'] }, { path: ['a', 'b', 'd'] }]
         // into { 'a ❯ b': ['c', 'd'] }.
         let pathMap = new Map<string, ({ name: string } & TestResult)[]>();
@@ -117,6 +118,8 @@ export class DOMReporter implements Reporter {
         }
         parent.appendChild(p);
     }
+
+    finalize() {}
 }
 
 let r = typeof document !== 'undefined' ? new DOMReporter() : new StreamReporter({ writeln: console.log });
@@ -127,4 +130,4 @@ r.update(['Tetromino', 'generate', 'tessellates'], { success: false, output: 'as
 r.update(['Tetromino', 'solve', 'works'], { success: true, output: '' });
 r.update(['discombobulate'], { success: false, output: 'hippopotamonstrosesquippedaliophobia' });
 r.update(['recombobulate'], { success: true, output: '' });
-if (r instanceof StreamReporter) r.display();
+r.finalize();