feat(api): add getSeed method (#8592)

Author: sheremet-va

docs/advanced/api/vitest.md

@@ -579,6 +579,14 @@ function disableCoverage(): void
 
 This method disables coverage collection for tests that run afterwards.
 
+## getSeed <Version>4.0.0</Version> {#getseed}
+
+```ts
+function getSeed(): number | null
+```
+
+Returns the seed, if tests are running in a random order.
+
 ## experimental_parseSpecification <Version>4.0.0</Version> <Badge type="warning">experimental</Badge> {#parsespecification}
 
 ```ts

packages/vitest/src/node/core.ts

@@ -502,6 +502,13 @@ export class Vitest {
     }
   }
 
+  /**
+   * Returns the seed, if tests are running in a random order.
+   */
+  public getSeed(): number | null {
+    return this.config.sequence.seed ?? null
+  }
+
   /** @internal */
   public async _reportFileTask(file: File): Promise<void> {
     const project = this.getProjectByName(file.projectName || '')