fix(expect): print full error if promise is rejected (vitest-dev#4467)

LorenzoBloedow · Dec 19, 2023 · 633b382 · 633b382
1 parent 4af9d90
commit 633b382
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Showing 2 changed files with 6 additions and 3 deletions.
diff --git a/packages/expect/src/jest-expect.ts b/packages/expect/src/jest-expect.ts
@@ -675,7 +675,8 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
               const _error = new AssertionError(
                 `promise rejected "${utils.inspect(err)}" instead of resolving`,
                 { showDiff: false },
-              )
+              ) as Error
+              _error.cause = err
               _error.stack = (error.stack as string).replace(error.message, _error.message)
               throw _error
             },
@@ -712,8 +713,8 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
             (value: any) => {
               const _error = new AssertionError(
                 `promise resolved "${utils.inspect(value)}" instead of rejecting`,
-                { showDiff: false },
-              )
+                { showDiff: true, expected: new Error('rejected promise'), actual: value },
+              ) as any
               _error.stack = (error.stack as string).replace(error.message, _error.message)
               throw _error
             },

diff --git a/test/core/test/jest-expect.test.ts b/test/core/test/jest-expect.test.ts
@@ -814,6 +814,8 @@ describe('async expect', () => {
     }
     catch (err: any) {
       expect(err.message).toMatchInlineSnapshot(`"promise rejected "Error: some error { foo: { bar: 42 } }" instead of resolving"`)
+      expect(err.cause).toBeDefined()
+      expect(err.cause.message).toMatchInlineSnapshot(`"some error"`)
       expect(err.stack).toContain('jest-expect.test.ts')
     }
   })