test: use exported response reader in proxy fixtures

src/proxyErrorResponses.test.mjs

@@ -2,6 +2,7 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import { readFileSync } from 'node:fs';
 import path from 'node:path';
+import { readResponseTextCapped } from './sources/httpBody.js';
 
 const source = ['local.js', 'common/http.js', 'aircraft/enrichment.js', 'terrain.js', 'space/celestrak.js', 'space/launch-library.js', '../../src/data/spaceProviderRequests.js']
   .map(file => readFileSync(new URL(`../server/providers/${file}`, import.meta.url), 'utf8'))
@@ -20,6 +21,7 @@ function extract(name) {
 function fixture(name, overrides = {}, preview = false) {
   const logs = [];
   const deps = {
+    readResponseTextCapped,
     path, process: { cwd: () => '/fixture', env: {} },
     fsp: {
       readFile: async () => { throw new Error('cache absent'); },
@@ -34,7 +36,7 @@ function fixture(name, overrides = {}, preview = false) {
     resolveTerrainHeightRequest: async () => { throw new Error(detail); },
     ...overrides,
   };
-  const helpers = ['readResponseTextCapped', 'coalesceProxyRequest', 'launchLibraryRequestHeaders', 'celestrakTleUrl', 'launchLibraryRecentUrl'].map(extract).join('\n');
+  const helpers = ['coalesceProxyRequest', 'launchLibraryRequestHeaders', 'celestrakTleUrl', 'launchLibraryRecentUrl'].map(extract).join('\n');
   const plugin = new Function(...Object.keys(deps), `${helpers}\n${extract(name)}\nreturn ${name}();`)(...Object.values(deps));
   let middleware;
   plugin[preview ? 'configurePreviewServer' : 'configureServer']({ middlewares: { use(_route, handler) { middleware = handler; } } });