refactoring and tests

website/src/test/hooks.mjs

@@ -0,0 +1,27 @@
+// Resolves the virtual modules of SvelteKit to stubs, so that the code that imports them can be
+// tested outside of the framework.
+import { fileURLToPath, pathToFileURL } from 'node:url';
+
+const stubs = {
+    '$app/environment': 'app-environment.ts',
+    '$app/paths': 'app-paths.ts',
+    '$app/state': 'app-state.ts',
+    '$env/static/public': 'env-static-public.ts',
+};
+
+export async function resolve(specifier, context, nextResolve) {
+    const stub = stubs[specifier];
+    if (stub) {
+        const url = pathToFileURL(fileURLToPath(new URL(`./stubs/${stub}`, import.meta.url)));
+        return nextResolve(url.href, context);
+    }
+    return nextResolve(specifier, context);
+}
+
+// Stylesheets are for the browser: importing one gives nothing.
+export async function load(url, context, nextLoad) {
+    if (url.endsWith('.css')) {
+        return { format: 'module', source: '', shortCircuit: true };
+    }
+    return nextLoad(url, context);
+}