test(e2e): assert output existence, not content, in vite_build_cache

The previous snapshot embedded Vite's minified JS output, which would
churn on every Vite version bump. Add a tiny `vtt stat-file` helper that
reports `exists` / `missing` and use that instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: branchseer

crates/vite_task_bin/src/vtt/main.rs

@@ -20,6 +20,7 @@ mod print_file;
 mod read_stdin;
 mod replace_file_content;
 mod rm;
+mod stat_file;
 mod touch_file;
 mod write_file;
 
@@ -28,7 +29,7 @@ fn main() {
     if args.len() < 2 {
         eprintln!("Usage: vtt <subcommand> [args...]");
         eprintln!(
-            "Subcommands: barrier, check-tty, cp, exit, exit-on-ctrlc, mkdir, pipe-stdin, print, print-cwd, print-env, print-file, read-stdin, replace-file-content, rm, touch-file, write-file"
+            "Subcommands: barrier, check-tty, cp, exit, exit-on-ctrlc, mkdir, pipe-stdin, print, print-cwd, print-env, print-file, read-stdin, replace-file-content, rm, stat-file, touch-file, write-file"
         );
         std::process::exit(1);
     }
@@ -54,6 +55,10 @@ fn main() {
         "read-stdin" => read_stdin::run(),
         "replace-file-content" => replace_file_content::run(&args[2..]),
         "rm" => rm::run(&args[2..]),
+        "stat-file" => {
+            stat_file::run(&args[2..]);
+            Ok(())
+        }
         "touch-file" => touch_file::run(&args[2..]),
         "write-file" => write_file::run(&args[2..]),
         other => {

crates/vite_task_bin/src/vtt/stat_file.rs

@@ -0,0 +1,9 @@
+pub fn run(args: &[String]) {
+    for file in args {
+        if std::fs::metadata(file).is_ok() {
+            println!("{file}: exists");
+        } else {
+            println!("{file}: missing");
+        }
+    }
+}

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite_build_cache/snapshots.toml

@@ -9,10 +9,11 @@ name = "vite_build_caches_and_restores_outputs"
 ignore = true
 steps = [
   ["vt", "run", "--cache", "build"],
-  # Verify the build emitted output.
-  ["vtt", "print-file", "dist/assets/main.js"],
+  # Verify the build emitted output (existence check; content is Vite's
+  # minified JS and would make the snapshot brittle across Vite versions).
+  ["vtt", "stat-file", "dist/assets/main.js"],
   # Delete the output artefact and re-run — the cache hit should restore it.
   ["vtt", "rm", "dist/assets/main.js"],
   { argv = ["vt", "run", "--cache", "build"], comment = "cache hit: outputs restored without manual config" },
-  ["vtt", "print-file", "dist/assets/main.js"],
+  ["vtt", "stat-file", "dist/assets/main.js"],
 ]

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite_build_cache/snapshots/vite_build_caches_and_restores_outputs.md

@@ -6,10 +6,10 @@
 $ vite build
 ```
 
-## `vtt print-file dist/assets/main.js`
+## `vtt stat-file dist/assets/main.js`
 
 ```
-(function(){let e=document.createElement(`link`).relList;if(e&&e.supports&&e.supports(`modulepreload`))return;for(let e of document.querySelectorAll(`link[rel="modulepreload"]`))n(e);new MutationObserver(e=>{for(let t of e)if(t.type===`childList`)for(let e of t.addedNodes)e.tagName===`LINK`&&e.rel===`modulepreload`&&n(e)}).observe(document,{childList:!0,subtree:!0});function t(e){let t={};return e.integrity&&(t.integrity=e.integrity),e.referrerPolicy&&(t.referrerPolicy=e.referrerPolicy),e.crossOrigin===`use-credentials`?t.credentials=`include`:e.crossOrigin===`anonymous`?t.credentials=`omit`:t.credentials=`same-origin`,t}function n(e){if(e.ep)return;e.ep=!0;let n=t(e);fetch(e.href,n)}})(),document.body.append((e=>`hello, ${e}`)(`vite`));
+dist/assets/main.js: exists
 ```
 
 ## `vtt rm dist/assets/main.js`
@@ -28,8 +28,8 @@ $ vite build ◉ cache hit, replaying
 vt run: cache hit.
 ```
 
-## `vtt print-file dist/assets/main.js`
+## `vtt stat-file dist/assets/main.js`
 
 ```
-(function(){let e=document.createElement(`link`).relList;if(e&&e.supports&&e.supports(`modulepreload`))return;for(let e of document.querySelectorAll(`link[rel="modulepreload"]`))n(e);new MutationObserver(e=>{for(let t of e)if(t.type===`childList`)for(let e of t.addedNodes)e.tagName===`LINK`&&e.rel===`modulepreload`&&n(e)}).observe(document,{childList:!0,subtree:!0});function t(e){let t={};return e.integrity&&(t.integrity=e.integrity),e.referrerPolicy&&(t.referrerPolicy=e.referrerPolicy),e.crossOrigin===`use-credentials`?t.credentials=`include`:e.crossOrigin===`anonymous`?t.credentials=`omit`:t.credentials=`same-origin`,t}function n(e){if(e.ep)return;e.ep=!0;let n=t(e);fetch(e.href,n)}})(),document.body.append((e=>`hello, ${e}`)(`vite`));
+dist/assets/main.js: exists
 ```