TODO: consider dom sandbox for testing ui (see long desc)

see https://discord.com/channels/1388415325036609617/1458088018232479824/1484195713347879012

cmd/pkgserver/ui.go

@@ -29,6 +29,8 @@ func serveStaticContent(w http.ResponseWriter, r *http.Request) {
 		http.ServeFileFS(w, r, content, "ui/static/test.js")
 	case "/static/test.css":
 		http.ServeFileFS(w, r, content, "ui/static/test.css")
+	case "/static/all_tests.js":
+		http.ServeFileFS(w, r, content, "ui/static/all_tests.js")
 	case "/static/test_tests.js":
 		http.ServeFileFS(w, r, content, "ui/static/test_tests.js")
 	default:

cmd/pkgserver/ui/static/all_tests.ts

@@ -0,0 +1 @@
+import "./test_tests.js";

cmd/pkgserver/ui/static/run_tests.ts

@@ -2,6 +2,6 @@
 // Many editors have terminal emulators built in, so running tests with NodeJS
 // provides faster iteration, especially for those acclimated to test-driven
 // development.
-import "./test_tests.js";
+import "./all_tests.js";
 import { run, StreamReporter } from "./test.js";
 run(new StreamReporter({ writeln: console.log }));

cmd/pkgserver/ui/static/test.ts

@@ -1,9 +1,9 @@
 // =============================================================================
 // DSL
 
-type TestTree = { name: string } & (TestGroup | Test);
+type TestTree = TestGroup | Test;
-type TestGroup = { children: TestTree[] };
+type TestGroup = { name: string, children: TestTree[] };
-type Test = { test: (TestController) => void };
+type Test = { name: string, test: (TestController) => void };
 
 let TESTS: ({ name: string } & TestGroup)[] = [];
 
@@ -34,17 +34,26 @@ function checkDuplicates(parent: string, names: { name: string }[]) {
 
 class FailNowSentinel {}
 
-class TestController {
+export type Journal = ({ method: "fail" } | { method: "log", message: string })[];
-    #logBuf: string[];
+function formatJournal(journal: Journal): string {
+    return journal
+        .filter((e) => e.method === "log")
+        .map((e) => e.message)
+        .join("\n");
+}
+
+export class TestController {
+    journal: Journal;
     #failed: boolean;
 
     constructor() {
-        this.#logBuf = [];
+        this.journal = [];
         this.#failed = false;
     }
 
     fail() {
         this.#failed = true;
+        this.journal.push({ method: "fail" });
     }
 
     failed(): boolean {
@@ -57,7 +66,7 @@ class TestController {
     }
 
     log(message: string) {
-        this.#logBuf.push(message);
+        this.journal.push({ method: "log", message });
     }
 
     error(message: string) {
@@ -69,10 +78,6 @@ class TestController {
         this.log(message);
         this.failNow();
     }
-
-    getLog(): string {
-        return this.#logBuf.join("\n");
-    }
 }
 
 // =============================================================================
@@ -80,35 +85,34 @@ class TestController {
 
 export interface TestResult {
     success: boolean;
-    output: string;
+    journal: Journal;
 }
 
-function runTests(reporter: Reporter, parents: string[], tree: TestTree) {
+export function run(reporter: Reporter) {
-    const path = [...parents, tree.name];
+    reporter.register(TESTS);
-    if ("children" in tree) {
+    for (const suite of TESTS) {
-        for (const c of tree.children) runTests(reporter, path, c);
+        for (const c of suite.children) runTests(reporter, [suite.name], c);
+    }
+    reporter.finalize();
+}
+
+function runTests(reporter: Reporter, parents: string[], node: TestTree) {
+    const path = [...parents, node.name];
+    if ("children" in node) {
+        for (const c of node.children) runTests(reporter, path, c);
         return;
     }
     let controller = new TestController();
     let excStr: string;
     try {
-        tree.test(controller);
+        node.test(controller);
     } catch (e) {
         if (!(e instanceof FailNowSentinel)) {
-            controller.fail();
             excStr = extractExceptionString(e);
         }
     }
-    const log = controller.getLog();
+    if (excStr !== undefined) controller.error(excStr);
-    const output = (log && excStr) ? `${log}\n${excStr}` : `${log}${excStr ?? ''}`;
+    reporter.update(path, { success: !controller.failed(), journal: controller.journal });
-    reporter.update(path, { success: !controller.failed(), output });
-}
-
-export function run(reporter: Reporter) {
-    for (const suite of TESTS) {
-        for (const c of suite.children) runTests(reporter, [suite.name], c);
-    }
-    reporter.finalize();
 }
 
 function extractExceptionString(e: any): string {
@@ -126,6 +130,7 @@ function extractExceptionString(e: any): string {
 // Reporting
 
 export interface Reporter {
+    register(suites: TestGroup[]): void
     update(path: string[], result: TestResult): void;
     finalize(): void;
 }
@@ -149,6 +154,8 @@ export class StreamReporter implements Reporter {
         this.counts = { successes: 0, failures: 0 };
     }
 
+    register(suites: TestGroup[]) {}
+
     update(path: string[], result: TestResult) {
         if (path.length === 0) throw new RangeError("path is empty");
         const pathStr = path.join(SEP);
@@ -192,10 +199,11 @@ export class StreamReporter implements Reporter {
 
     #writeOutput(test: { name: string } & TestResult, prefix: string, nested: boolean) {
         let output = "";
-        if (test.output) {
+        let logOutput = formatJournal(test.journal);
-            const lines = test.output.split("\n");
+        if (logOutput) {
+            const lines = logOutput.split("\n");
             if (lines.length <= 1) {
-                output = `: ${test.output}`;
+                output = `: ${logOutput}`;
             } else {
                 const padding = nested ? "      " : "  ";
                 output = ":\n" + lines.map((line) => padding + line).join("\n");
@@ -206,6 +214,8 @@ export class StreamReporter implements Reporter {
 }
 
 export class DOMReporter implements Reporter {
+    register(suites: TestGroup[]) {}
+
     update(path: string[], result: TestResult) {
         if (path.length === 0) throw new RangeError("path is empty");
         const counter = document.getElementById(result.success ? "successes" : "failures");
@@ -237,9 +247,10 @@ export class DOMReporter implements Reporter {
         }
         const p = document.createElement("p");
         p.classList.add("test-desc");
-        if (result.output) {
+        const logOutput = formatJournal(result.journal);
+        if (logOutput) {
             const pre = document.createElement("pre");
-            pre.appendChild(document.createTextNode(result.output));
+            pre.appendChild(document.createTextNode(logOutput));
             p.appendChild(pre);
         } else {
             p.classList.add("italic");
@@ -250,3 +261,32 @@ export class DOMReporter implements Reporter {
 
     finalize() {}
 }
+
+interface GoNode {
+    name: string;
+    subtests?: GoNode[];
+}
+
+// Used to display results via `go test`, via some glue code from the Go side.
+export class GoTestReporter implements Reporter {
+    // Convert a test tree into the one expected by the Go code.
+    static serialize(node: TestTree): GoNode {
+        if (!("children" in node)) return { name: node.name };
+        return {
+            name: node.name,
+            subtests: node.children.map(GoTestReporter.serialize),
+        };
+    }
+
+    register(suites: TestGroup[]) {
+        console.log(JSON.stringify(suites.map(GoTestReporter.serialize)));
+    }
+
+    update(path: string[], result: TestResult) {
+        console.log(JSON.stringify({ "path": path, ...result }));
+    }
+
+    finalize() {
+        console.log("null");
+    }
+}

cmd/pkgserver/ui/test.html

@@ -18,7 +18,7 @@
 <div id="root">
 </div>
 
-<script type="module" src="./static/test_tests.js"></script>
+<script type="module" src="./static/all_tests.js"></script>
 <script type="module">
     import { DOMReporter, run } from "./static/test.js";
     run(new DOMReporter());