test: isolate the home directory on Windows (USERPROFILE)

test/apply.test.js

@@ -104,8 +104,7 @@ test('every turn looks the Hub up with its own prompt, without repeating assets'
     });
   });
   await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
-  const home = process.env.HOME;
-  process.env.HOME = mkdtempSync(join(tmpdir(), 'evolver-prime-home-'));
+  const restoreHome = freshHome('evolver-prime-home-');
 
   try {
     const { ctx, listeners } = fakeContext();
@@ -129,7 +128,7 @@ test('every turn looks the Hub up with its own prompt, without repeating assets'
     assert.match(second[0].content[0].text, /^1\. Chunk the download\.$/m);
     assert.doesNotMatch(second[0].content[0].text, /sha256:abc/);
   } finally {
-    process.env.HOME = home;
+    restoreHome();
     server.close();
   }
 });
@@ -262,8 +261,7 @@ test('a search slower than the wait budget injects itself instead of holding the
     });
   });
   await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
-  const home = process.env.HOME;
-  process.env.HOME = mkdtempSync(join(tmpdir(), 'evolver-slow-home-'));
+  const restoreHome = freshHome('evolver-slow-home-');
 
   try {
     const { ctx, listeners } = fakeContext();
@@ -276,7 +274,7 @@ test('a search slower than the wait budget injects itself instead of holding the
     assert.match(injected[0].content[0].text, /evolver_asset_reuse_result for sha256:slow\./);
     assert.match(injected[0].content[0].text, /^1\. Arrived late\.$/m);
   } finally {
-    process.env.HOME = home;
+    restoreHome();
     server.close();
   }
 });

test/diagnostics.test.js

@@ -1,12 +1,12 @@
 import assert from 'node:assert/strict';
-import { mkdirSync, mkdtempSync, writeFileSync } from 'node:fs';
-import { tmpdir } from 'node:os';
+import { mkdirSync, writeFileSync } from 'node:fs';
 import { join } from 'node:path';
 import { test } from 'node:test';
 
 import { createRecallLog, createReportLog, pluginDiagnostics } from '../src/diagnostics.js';
 import { hubGene } from '../src/prime.js';
 import { evolverTools } from '../src/tools.js';
+import { freshHome } from './support/host.js';
 
 const PROMPT = 'add a retry to the uploader';
 const steps = (count, text = 'step') => Array.from({ length: count }, (_, index) => `${text} ${index}.`);
@@ -105,8 +105,7 @@ test('evolver_status reports an unreachable Proxy instead of failing, and still
 });
 
 test('diagnostics flag a running Proxy older than the minimum even when PATH has a newer evolver', async () => {
-  const home = process.env.HOME;
-  process.env.HOME = mkdtempSync(join(tmpdir(), 'evolver-diagnostics-home-'));
+  const restoreHome = freshHome('evolver-diagnostics-home-');
   try {
     mkdirSync(join(process.env.HOME, '.evolver'));
     writeFileSync(join(process.env.HOME, '.evolver', 'settings.json'), JSON.stringify({
@@ -135,6 +134,6 @@ test('diagnostics flag a running Proxy older than the minimum even when PATH has
     assert.equal(report.runtime.platform, process.platform);
     assert.deepEqual(report.reuse_reports, { delivered: [], rejected: [] });
   } finally {
-    process.env.HOME = home;
+    restoreHome();
   }
 });

test/support/host.js

@@ -137,7 +137,19 @@ export async function startProxy(answer, { delayMs = () => 0 } = {}) {
 }
 
 export function freshHome(prefix) {
-  const home = process.env.HOME;
-  process.env.HOME = mkdtempSync(join(tmpdir(), prefix));
-  return () => { process.env.HOME = home; };
+  const keys = ['HOME', 'USERPROFILE', 'HOMEDRIVE', 'HOMEPATH'];
+  const previous = Object.fromEntries(keys.map((key) => [key, process.env[key]]));
+  const home = mkdtempSync(join(tmpdir(), prefix));
+  process.env.HOME = home;
+  if (process.platform === 'win32') {
+    process.env.USERPROFILE = home;
+    process.env.HOMEDRIVE = home.slice(0, 2);
+    process.env.HOMEPATH = home.slice(2);
+  }
+  return () => {
+    for (const key of keys) {
+      if (previous[key] === undefined) delete process.env[key];
+      else process.env[key] = previous[key];
+    }
+  };
 }