Fix settings for default-branch repositories

scripts/repo-settings.test.mjs

@@ -0,0 +1,23 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {readFileSync} from 'node:fs';
+import {createRequire} from 'node:module';
+import vm from 'node:vm';
+const require=createRequire(import.meta.url);
+globalThis.App={t:zh=>zh};
+const M=require('../web/assets/management.js');
+const source=readFileSync(new URL('../web/assets/repo-page.js',import.meta.url),'utf8');
+const settings=source.slice(source.indexOf('  function ensureDraft()'),source.indexOf('  function capture()'));
+test('settings render for seeded default-branch repositories and preserve explicit branches',()=>{
+ for(const branches of [null,undefined,[],['release']]){
+  const repo={policy:{branches,default_branch:true,count:1},index_mode:'full'};
+  const ctx={repo,M,A:{user:()=>({})},canRepo:()=>true,keep:()=>[1,'commit'],t:zh=>zh,esc:String,btn2:''};
+  vm.runInNewContext('let draft;'+settings+'; result={html:settings(),draft};',ctx);
+  assert.match(ctx.result.html,/id="pgit-timeout"/);
+  assert.match(ctx.result.html,/value="0" selected/);
+  assert.equal(ctx.result.draft.defaultBranch,true);
+  assert.deepEqual(Array.from(ctx.result.draft.branches),branches||[]);
+  ctx.result.draft.branches.push('another');
+  if(branches)assert.ok(!branches.includes('another'));
+ }
+});