cmd/pkgserver: add basic CLI reporter for testing JS

cmd/pkgserver/ui/static/test.ts

@@ -0,0 +1,86 @@
+export interface TestResult {
+    success: boolean;
+    output: string;
+}
+
+// =============================================================================
+// Reporting
+
+export interface Reporter {
+    update(path: string[], result: TestResult): void;
+}
+
+export interface Stream {
+    writeln(s: string): void;
+}
+
+export class StreamReporter implements Reporter {
+    stream: Stream;
+    verbose: boolean;
+    #failures: ({ path: string[] } & TestResult)[];
+    counts: { successes: number, failures: number };
+
+    constructor(stream: Stream, verbose: boolean = false) {
+        this.stream = stream;
+        this.verbose = verbose;
+        this.#failures = [];
+        this.counts = { successes: 0, failures: 0 };
+    }
+
+    update(path: string[], result: TestResult) {
+        if (path.length === 0) throw new RangeError("path is empty");
+        const pathStr = path.join(" ❯ ");
+        if (result.success) {
+            this.counts.successes++;
+            if (this.verbose) this.stream.writeln(`✅️ ${pathStr}`);
+        } else {
+            this.counts.failures++;
+            this.stream.writeln(`⚠️ ${pathStr}`);
+            this.#failures.push({ path, ...result });
+        }
+    }
+
+    display() {
+        // Transform [{ path: ["a", "b", "c"] }, { path: ["a", "b", "d"] }]
+        // into { "a ❯ b": ["c", "d"] }.
+        let pathMap = new Map<string, ({ name: string } & TestResult)[]>();
+        for (const f of this.#failures) {
+            const key = f.path.slice(0, -1).join(" ❯ ");
+            if (!pathMap.has(key)) pathMap.set(key, []);
+            pathMap.get(key).push({ name: f.path.at(-1), ...f });
+        }
+
+        this.stream.writeln("");
+        this.stream.writeln("FAILURES");
+        this.stream.writeln("========");
+
+        for (const [path, tests] of pathMap) {
+            if (tests.length === 1) {
+                const t = tests[0];
+                const pathStr = path ? `${path} ❯ ` : "";
+                const output = t.output ? `: ${t.output}` : "";
+                this.stream.writeln(`${pathStr}${t.name}${output}`);
+            } else {
+                this.stream.writeln(path);
+                for (const t of tests) {
+                    const output = t.output ? `: ${t.output}` : "";
+                    this.stream.writeln(`  - ${t.name}${output}`);
+                }
+            }
+        }
+
+        this.stream.writeln("");
+        const { successes, failures } = this.counts;
+        this.stream.writeln(`${successes} succeeded, ${failures} failed`);
+    }
+}
+
+const r = new StreamReporter({ writeln: console.log }, true);
+r.update(["alien", "can walk"], { success: false, output: "assertion failed" });
+r.update(["alien", "can speak"], { success: false, output: "Uncaught ReferenceError: larynx is not defined" });
+r.update(["alien", "sleep"], { success: true, output: "" });
+r.update(["Tetromino", "generate", "tessellates"], { success: false, output: "assertion failed: 1 != 2" });
+r.update(["Tetromino", "solve", "works"], { success: true, output: "" });
+r.update(["discombobulate"], { success: false, output: "hippopotamonstrosesquippedaliophobia" });
+r.update(["recombobulate"], { success: true, output: "" });
+r.display();