fix: log seed when only sequence.shuffle.tests is enabled

.changeset/fix-shuffle-tests-seed-logging.md

@@ -0,0 +1,11 @@
+---
+"vitest": patch
+---
+
+fix: log seed when only `sequence.shuffle.tests` is enabled
+
+Previously, the seed was only logged when `sequence.shuffle.files` was enabled (which uses RandomSequencer). 
+Now the seed is also logged when only `sequence.shuffle.tests` is enabled, since the seed is used for 
+shuffling tests within files even when file order is not randomized.
+
+Fixes #9557

packages/vitest/src/node/config/resolveConfig.ts

@@ -742,7 +742,8 @@ export function resolveConfig(
   }
   resolved.sequence.groupOrder ??= 0
   resolved.sequence.hooks ??= 'stack'
-  if (resolved.sequence.sequencer === RandomSequencer) {
+  // Set seed if either files or tests are shuffled
+  if (resolved.sequence.sequencer === RandomSequencer || resolved.sequence.shuffle) {
     resolved.sequence.seed ??= Date.now()
   }
 

packages/vitest/src/node/logger.ts

@@ -232,7 +232,8 @@ export class Logger {
 
     this.log(withLabel(color, mode, `v${this.ctx.version} `) + c.gray(this.ctx.config.root))
 
-    if (this.ctx.config.sequence.sequencer === RandomSequencer) {
+    // Log seed if either files (RandomSequencer) or tests are shuffled
+    if (this.ctx.config.sequence.sequencer === RandomSequencer || this.ctx.config.sequence.shuffle) {
       this.log(PAD + c.gray(`Running tests with seed "${this.ctx.config.sequence.seed}"`))
     }