Checkpoint web parity through Chromium input tasks

web/tests/unit/keyboard-contract.test.mjs

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+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import test from "node:test";
+import ts from "../../node_modules/typescript/lib/typescript.js";
+
+const root = path.resolve(import.meta.dirname, "../../..");
+const sourcePath = path.join(root, "web/protocol/keyboard-contract.ts");
+const output = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), { compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 }, fileName: sourcePath, reportDiagnostics: true });
+assert.deepEqual(output.diagnostics, []);
+const keyboard = await import(`data:text/javascript;base64,${Buffer.from(output.outputText).toString("base64")}`);
+
+test("M14-04E preserves layout character, physical code, location and modifiers", () => {
+  assert.deepEqual(keyboard.observeKeyboardEvent({ key: "ä", code: "Quote", location: 0, shiftKey: true, ctrlKey: false, altKey: true, metaKey: false, repeat: true, isComposing: false }), { schemaVersion: 1, key: "ä", code: "Quote", location: 0, shiftKey: true, ctrlKey: false, altKey: true, metaKey: false, repeat: true, isComposing: false, deadKey: false });
+  assert.equal(keyboard.observeKeyboardEvent({ key: "Dead", code: "Quote", location: 0 }).deadKey, true);
+});
+
+test("M14-04E rejects malformed key identity", () => {
+  assert.throws(() => keyboard.observeKeyboardEvent({ key: "", code: "KeyA", location: 0 }), /KEY_IDENTITY_INVALID/);
+  assert.throws(() => keyboard.observeKeyboardEvent({ key: "a", code: "KeyA", location: 4 }), /KEY_LOCATION_INVALID/);
+});