docs: update Snapshot section to provide details on how to use with c…

…oncurrent test

close vitest-dev#2729

docs/guide/features.md

@@ -44,16 +44,16 @@ Learn more about [Test Filtering](./filtering.md).
 
 ## Running tests concurrently
 
-Use `.concurrent` in consecutive tests to run them in parallel.
+Use `.concurrent` in consecutive tests to run them in parallel. Also, be sure to use `expect` from the [Test Context](/guide/test-context.md) to ensure the right test is being detected.
 
 ```ts
 import { describe, it } from 'vitest'
 
 // The two tests marked with concurrent will be run in parallel
 describe('suite', () => {
   it('serial test', async () => { /* ... */ })
-  it.concurrent('concurrent test 1', async () => { /* ... */ })
-  it.concurrent('concurrent test 2', async () => { /* ... */ })
+  it.concurrent('concurrent test 1', async ({ expect }) => { /* ... */ })
+  it.concurrent('concurrent test 2', async ({ expect }) => { /* ... */ })
 })
 ```
 
@@ -64,9 +64,9 @@ import { describe, it } from 'vitest'
 
 // All tests within this suite will be run in parallel
 describe.concurrent('suite', () => {
-  it('concurrent test 1', async () => { /* ... */ })
-  it('concurrent test 2', async () => { /* ... */ })
-  it.concurrent('concurrent test 3', async () => { /* ... */ })
+  it('concurrent test 1', async ({ expect }) => { /* ... */ })
+  it('concurrent test 2', async ({ expect }) => { /* ... */ })
+  it.concurrent('concurrent test 3', async ({ expect }) => { /* ... */ })
 })
 ```
 

docs/guide/snapshot.md

@@ -33,6 +33,10 @@ exports['toUpperCase 1'] = '"FOOBAR"'
 
 The snapshot artifact should be committed alongside code changes, and reviewed as part of your code review process. On subsequent test runs, Vitest will compare the rendered output with the previous snapshot. If they match, the test will pass. If they don't match, either the test runner found a bug in your code that should be fixed, or the implementation has changed and the snapshot needs to be updated.
 
+::: warning
+When using Snapshots with async concurrent tests, you need to use `expect` from the [Test Context](/guide/test-context.md) to ensure the right test is being detected.
+:::
+
 ## Inline Snapshots
 
 Similarly, you can use the [`toMatchInlineSnapshot()`](/api/expect#tomatchinlinesnapshot) to store the snapshot inline within the test file.
@@ -59,6 +63,10 @@ it('toUpperCase', () => {
 
 This allows you to see the expected output directly without jumping across different files.
 
+::: warning
+When using Snapshots with async concurrent tests, you need to use `expect` from the [Test Context](/guide/test-context.md) to ensure the right test is being detected.
+:::
+
 ## Updating Snapshots
 
 When the received value doesn't match the snapshot, the test fails and shows you the difference between them. When the snapshot change is expected, you may want to update the snapshot from the current state.