diff --git a/tests/docs-integrity.test.ts b/tests/docs-integrity.test.ts
index 2236e59..ac28e0e 100644
--- a/tests/docs-integrity.test.ts
+++ b/tests/docs-integrity.test.ts
@@ -23,7 +23,8 @@ function markdownFiles(): string[] {
       } else if (name.name.endsWith('.md')) {
         // eval/ holds huge run logs; only its READMEs are prose worth link-checking.
         if (opts.onlyReadme && name.name !== 'README.md') continue;
-        out.push(childRel);
+        // Forward slashes so assertions and anchorsByFile keys match on Windows.
+        out.push(childRel.replace(/\\/g, '/'));
       }
     }
   };
diff --git a/tests/export-git-e2e.test.ts b/tests/export-git-e2e.test.ts
index babd449..0edeaaf 100644
--- a/tests/export-git-e2e.test.ts
+++ b/tests/export-git-e2e.test.ts
@@ -10,7 +10,9 @@ import { fileURLToPath } from 'node:url';
 // Runs the actual CLI via tsx against a throwaway git repo and asserts the
 // untracked-file filtering. Kept in its own file because it spawns a subprocess.
 const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
-const tsxBin = path.join(repoRoot, 'node_modules', '.bin', 'tsx');
+// tsx's JS entry, run via process.execPath: the .bin/tsx shim is a .cmd on
+// Windows, which spawnSync can't execute without a shell.
+const tsxCli = path.join(repoRoot, 'node_modules', 'tsx', 'dist', 'cli.mjs');
 
 function git(cwd: string, args: string[]): void {
   const r = spawnSync('git', args, { cwd, encoding: 'utf8' });
@@ -43,8 +45,8 @@ describe('pxpipe export --git (end-to-end)', () => {
 
   it('applies --include, the size cap, and the binary sniff to untracked files', () => {
     const run = spawnSync(
-      tsxBin,
-      ['src/node.ts', 'export', '--git', repo, '--include', '*.ts', '--out', outDir, '--json'],
+      process.execPath,
+      [tsxCli, 'src/node.ts', 'export', '--git', repo, '--include', '*.ts', '--out', outDir, '--json'],
       { cwd: repoRoot, encoding: 'utf8', timeout: 120_000 },
     );
     expect(run.status, `stderr:\n${run.stderr}`).toBe(0);
diff --git a/vitest.config.ts b/vitest.config.ts
index a7b13d6..a25ed31 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,12 +1,11 @@
 import { defineConfig } from 'vitest/config';
 
-const TEST_FILE_PATTERNS = ['tests/**/*.test.ts'];
-const TEST_TIMEOUT_MS = 30_000;
-
 export default defineConfig({
   test: {
-    include: TEST_FILE_PATTERNS,
+    include: ['tests/**/*.test.ts'],
     environment: 'node',
-    testTimeout: TEST_TIMEOUT_MS,
+    // Render-heavy tests (full-page PNG encodes) can exceed the 5s default on
+    // slower machines; the work is CPU-bound, not hung.
+    testTimeout: 30_000,
   },
 });