feat: add multilingual interface support

test/deployment.test.js

@@ -0,0 +1,24 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const fs = require("node:fs");
+const path = require("node:path");
+
+const root = path.resolve(__dirname, "..");
+
+test("the Docker image includes every application script referenced by the page", () => {
+  const html = fs.readFileSync(path.join(root, "index.html"), "utf8");
+  const dockerfile = fs.readFileSync(path.join(root, "Dockerfile"), "utf8");
+  const applicationScripts = [...html.matchAll(/<script src="\.\/([^"]+\.js)"/g)]
+    .map((match) => match[1])
+    .filter((scriptPath) => !scriptPath.startsWith("vendor/"));
+
+  assert.ok(applicationScripts.length > 0);
+  applicationScripts.forEach((scriptPath) => {
+    assert.ok(fs.existsSync(path.join(root, scriptPath)), `${scriptPath} must exist`);
+    assert.match(
+      dockerfile,
+      new RegExp(`^COPY ${scriptPath.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")} \\.\\/$`, "m"),
+      `${scriptPath} must be copied by the Dockerfile`,
+    );
+  });
+});