TODO: consider writing tests for the test runner.

both on a test level and for the whole thing. i think the reporter or
registrar abstractions should deal with all timeouts, and just feed
elapsed time through all the functions: update() gets time for the
specific test, and finalize passes you the total time. this way you
don't need to do the same logic in every reporter, and you also give
a suggestion to reporter writers (i.e.: you in the future) to expose
test durations. actually tbh per-test isn't possible anywhere but in the
executor, especially when taking potential future parallel execution
into account

on the topic of parallelism: per-test is wall clock for that test,
regardless of perceived time, because no other number is useful. whole
thing is wall clock too, not cpu time

remember:
  - use monotonic clocks!! we need elapsed time, not absolute time
  - format them to more readable strings like “15h 12m” instead of
    “54738 seconds”. once things get large we can be less precise

for the go reporter: ask ozy if the go one already measures it. if so
then don't even bother serializing it

for the stream reporter: the live feed should include per-test time in
brackets or something. the final tree should only include timeout for
outliers on the long side (just shove a box plot-esque algo on it), and
if a flag is given print it for all nodes, and if another flag is given
print the n longest tests. the total time should be in the summary line
at the end in brackets à la pytest

for the dom reporter, we do the same as with the stream reporter's
outlier detection, and have a checkbox or button to dynamically
show/hide all timeouts, and another button to toggle a widget of sorts
that shows up right above the result tree which includes the n longest
tests. all these buttons should be on the same line as the summary
(successes/failures/skips). the total time should be included in the
“execution finished” text form the previous commit, i.e. “execution
finished in 15s”

~april+may

cmd/mbf/internal/pkgserver/ui/all_tests.ts

@@ -1,2 +1,2 @@
 // Import all test files to register their test suites.
-import "./sample_test.js";
+import "./index_test.js";

cmd/mbf/internal/pkgserver/ui/index_test.ts

@@ -0,0 +1,2 @@
+import { suite, test } from "./jstest/jstest.js";
+import "./index.js";

cmd/mbf/internal/pkgserver/ui/sample_test.ts

@@ -1,85 +0,0 @@
-import { NoOpReporter, TestRegistrar, context, group, suite, test } from "./jstest/jstest.js";
-
-suite("dog", [
-    group("tail", [
-        test("wags when happy", (t) => {
-            if (0 / 0 !== Infinity / Infinity) {
-                t.fatal("undefined must not be defined");
-            }
-        }),
-        test("idle when down", (t) => {
-            t.log("test test");
-            t.error("dog whining noises go here");
-        }),
-    ]),
-    test("likes headpats", (t) => {
-        if (2 !== 2) {
-            t.error("IEEE 754 violated: 2 is NaN");
-        }
-    }),
-    context("near cat", [
-        test("is ecstatic", (t) => {
-            if (("b" + "a" + + "a" + "a").toLowerCase() === "banana") {
-                t.error("🍌🍌🍌");
-                t.error("🍌🍌🍌");
-                t.error("🍌🍌🍌");
-                t.failNow();
-            }
-        }),
-        test("playfully bites cats' tails", (t) => {
-            t.log("arf!");
-            throw new Error("nom");
-        }),
-    ]),
-]);
-
-suite("cat", [
-    test("likes headpats", (t) => {
-        t.log("meow");
-    }),
-    test("owns skipping rope", (t) => {
-        t.skip("this cat is stuck in your machine!");
-        t.log("never logged");
-    }),
-    test("tester tester", (t) => {
-        const r = new TestRegistrar();
-        r.suite("explod", [
-            test("with yarn", (t) => {
-                t.log("YAY");
-            }),
-        ]);
-        const reporter = new NoOpReporter();
-        r.run(reporter);
-        if (reporter.suites.length !== 1) {
-            t.fatal(`incorrect number of suites registered got=${reporter.suites.length} want=1`);
-        }
-        const suite = reporter.suites[0];
-        if (suite.name !== "explod") {
-            t.error(`suite name incorrect got='${suite.name}' want='explod'`);
-        }
-        if (suite.children.length !== 1) {
-            t.fatal(`incorrect number of suite children got=${suite.children.length} want=1`);
-        }
-        const test_ = suite.children[0];
-        if (test_.name !== "with yarn") {
-            t.error(`incorrect test name got='${test_.name}' want='with yarn'`);
-        }
-        if ("children" in test_) {
-            t.error(`expected leaf node, got group of ${test_.children.length} children`);
-        }
-        if (!reporter.finalized) t.error(`expected reporter to have been finalized`);
-        if (reporter.results.length !== 1) {
-            t.fatal(`incorrect result count got=${reporter.results.length} want=1`);
-        }
-        const result = reporter.results[0];
-        if (!(result.path.length === 2 &&
-              result.path[0] === "explod" &&
-              result.path[1] === "with yarn")) {
-            t.error(`incorrect result path got=${result.path} want=["explod", "with yarn"]`);
-        }
-        if (result.state !== "success") t.error(`expected test to succeed`);
-        if (!(result.logs.length === 1 && result.logs[0] === "YAY")) {
-            t.error(`incorrect result logs got=${result.logs} want=["YAY"]`);
-        }
-    }),
-]);