fix(expect): soft assertions continue after .resolves/.rejects promise errors (#9843)

Co-authored-by: Maks Pikov <mixelburg@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>

Author: 3 people

packages/expect/src/jest-expect.ts

@@ -1128,6 +1128,7 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
               promise,
               createAssertionMessage(utils, this, !!args.length),
               error,
+              utils.flag(this, 'soft'),
             )
           }
         },
@@ -1203,6 +1204,7 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
               promise,
               createAssertionMessage(utils, this, !!args.length),
               error,
+              utils.flag(this, 'soft'),
             )
           }
         },

test/cli/fixtures/expect-soft/expects/soft.test.ts

@@ -75,6 +75,29 @@ test('promise with expect.extend', async () => {
   await expect.soft(2 + 2).toBeAsync(3);
 });
 
+test('promise rejection', async () => {
+  await expect
+    .soft(
+      Promise.resolve().then(() => {
+        throw new Error('boom 1st')
+      }),
+    )
+    .resolves.toBe('1st')
+
+  await expect
+    .soft(
+      Promise.resolve().then(() => {
+        throw new Error('boom 2nd')
+      }),
+    )
+    .resolves.toBe('2nd')
+})
+
+test('promise resolved instead of rejecting', async () => {
+  await expect.soft(Promise.resolve('value 1')).rejects.toBe('1st')
+  await expect.soft(Promise.resolve('value 2')).rejects.toBe('2nd')
+})
+
 test('passed', () => {
   expect.soft(1).toEqual(1)
   expect(10).toEqual(10)

test/cli/test/expect-soft.test.ts

@@ -45,6 +45,20 @@ describe('expect.soft', () => {
     expect.soft(stderr).toContain('Error: expected 4 to be 3')
   })
 
+  test('promise rejection', async () => {
+    const { stderr } = await run()
+    // both assertions should execute (not abort after first rejection)
+    expect.soft(stderr).toContain('promise rejected "Error: boom 1st" instead of resolving')
+    expect.soft(stderr).toContain('promise rejected "Error: boom 2nd" instead of resolving')
+  })
+
+  test('promise resolved instead of rejecting', async () => {
+    const { stderr } = await run()
+    // both assertions should execute
+    expect.soft(stderr).toContain('promise resolved "\'value 1\'" instead of rejecting')
+    expect.soft(stderr).toContain('promise resolved "\'value 2\'" instead of rejecting')
+  })
+
   test('passed', async () => {
     const { stdout } = await run()
     expect.soft(stdout).toContain('soft.test.ts > passed')