fix(expect): allow function as standard schema (#9099)

Author: hi-ogawa

packages/expect/src/jest-utils.ts

@@ -807,7 +807,7 @@ export function getObjectSubset(
 export function isStandardSchema(obj: any): obj is StandardSchemaV1 {
   return (
     !!obj
-    && typeof obj === 'object'
+    && (typeof obj === 'object' || typeof obj === 'function')
     && obj['~standard']
     && typeof obj['~standard'].validate === 'function'
   )

test/core/test/expect.test.ts

@@ -788,5 +788,10 @@ describe('Standard Schema', () => {
         `)
       }
     })
+
+    test('function', () => {
+      const stringSchemaFn = Object.assign(() => {}, stringSchema)
+      expect('hello').toEqual(expect.schemaMatching(stringSchemaFn))
+    })
   })
 })