WIP

dev-stubs/mu-hooks.mjs

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+// Maps the 'mu' import to dev-stubs/mu-stub.mjs, so tests run without the
+// template container.
+export async function resolve(specifier, context, nextResolve) {
+  if (specifier === 'mu') {
+    return { shortCircuit: true, url: new URL('./mu-stub.mjs', import.meta.url).href };
+  }
+  return nextResolve(specifier, context);
+}

dev-stubs/mu-stub.mjs

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+// Byte-for-byte copies of the three mu helpers the chat store uses, so the
+// unit test asserts on the same strings the container produces.
+// Registered for the 'mu' module by dev-stubs/register.js during tests only.
+export function sparqlEscapeString(value) {
+  return '"""' + value.replace(/[\\"]/g, (m) => '\\' + m) + '"""';
+}
+
+// The loop test drives ask() end to end; describe/lookup tools reach the
+// session helpers, so the stub implements them as no-ops.
+export async function query() {
+  return { results: { bindings: [] }, head: { vars: [] } };
+}
+export async function update() {}
+
+export function sparqlEscapeUri(value) {
+  return '<' + value.replace(/[\\"<>]/g, function (match) { return '\\' + match; }) + '>';
+}
+
+export function sparqlEscapeDateTime(value) {
+  return '"' + new Date(value).toISOString() + '"^^xsd:dateTime';
+}
+
+// The remaining template helpers db.js imports, copied from
+// helpers/mu/sparql.js in mu-javascript-template.
+export function sparqlEscapeInt(value) {
+  return '"' + Number.parseInt(value) + '"^^xsd:integer';
+}
+export function sparqlEscapeDate(value) {
+  return '"' + new Date(value).toISOString().substring(0, 10) + '"^^xsd:date';
+}
+export function sparqlEscapeBool(value) {
+  return value ? '"true"^^xsd:boolean' : '"false"^^xsd:boolean';
+}

dev-stubs/register.js

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+// node --import ./dev-stubs/register.js <test file>
+// Registers the 'mu' resolve hook (mu-hooks.mjs -> mu-stub.mjs).
+import { register } from 'node:module';
+
+register(new URL('./mu-hooks.mjs', import.meta.url).href);