refactor(test): relocate browser suite to test/browser

test/browser/testdata/counter/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>counter</title>
+  </head>
+  <body>
+    <button id="decrement">-</button>
+    <div id="counter">0</div>
+    <button id="increment">+</button>
+    <script>
+      let value = 0;
+      const display = document.getElementById("counter");
+      function render() {
+        display.textContent = String(value);
+      }
+      document.getElementById("increment").addEventListener("click", function () {
+        value += 1;
+        render();
+      });
+      document.getElementById("decrement").addEventListener("click", function () {
+        value -= 1;
+        render();
+      });
+    </script>
+  </body>
+</html>

test/browser/testdata/counter/spec.ts

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+import { always, extract, taps } from "@sanderling/spec";
+
+const counter = extract((s) => {
+  const el = s.ax.find({ id: "counter" });
+  return el ? parseInt(el.text, 10) || 0 : 0;
+}).named("counter");
+
+// The + and - buttons each move the counter by exactly 1, so no step ever
+// changes it by more than 1. A bug that double-applied a click would break this.
+const changesByAtMostOne = always(() => {
+  const previous = counter.previous;
+  if (previous === undefined) return true;
+  return Math.abs(counter.current - previous) <= 1;
+});
+
+export const properties = { changesByAtMostOne };
+
+export const actionsRoot = taps;

test/browser/testdata/throwing/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>throwing</title>
+  </head>
+  <body>
+    <button id="press">press</button>
+    <div id="count">0</div>
+    <script>
+      let presses = 0;
+      document.getElementById("press").addEventListener("click", function () {
+        presses += 1;
+        document.getElementById("count").textContent = String(presses);
+        if (presses >= 3) {
+          throw new Error("pressed too many times");
+        }
+      });
+    </script>
+  </body>
+</html>

test/browser/testdata/throwing/spec.ts

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+import { taps } from "@sanderling/spec";
+import { noUncaughtExceptions } from "@sanderling/spec/defaults/properties";
+
+export const properties = { noUncaughtExceptions };
+
+export const actionsRoot = taps;