cmd/pkgserver: move StreamReporter display() to Reporter interface

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();