expect(...).toMatchObject error is "AssertionError: Values are not equal." instead of
bugexpect
**Describe the bug**
When an expect(...).toMatchObject() fails, the failure message is "error: AssertionError: Values are not equal.". This is misleading because toMatchObject doesn't test for equality.
**Steps to Reproduce**
1. Create **toMatchObject.ts**:
```ts
import { test } from '@std/testing/bdd';
import { expect } from '@std/expect';
test('toMatchOBject should return fail message about matching, not equality', () => {
expect({ position: { x: 0, y: 'string' } }).toMatchObject({
position: {
x: expect.any(Number),
y: expect.any(Number)
}
});
});
```
2. Run:
```bash
$ deno test toMatchObject.ts
running 1 test from ./toMatchObject.ts
toMatchOBject should return fail message about matching, not equality ... FAILED (3ms)
ERRORS
toMatchOBject should return fail message about matching, not equality => ./toMatchObject.ts:4:1
error: AssertionError: Values are not equal.
[Diff] Actual / Expected
{
position: {
+ x: Any {
+ inverse: false,
+ value: [Function: Number],
+ },
+ y: Any {
+ inverse: false,
+ value: [Function: Number],
+ },
- x: 0,
- y: "string",
},
}
throw new AssertionError(
^
at triggerError (https://jsr.io/@std/expect/1.0.17/_matchers.ts:591:13)
at toMatchObject (https://jsr.io/@std/expect/1.0.17/_matchers.ts:600:5)
at applyMatcher (https://jsr.io/@std/expect/1.0.17/expect.ts:223:13)
at Proxy.<anonymous> (https://jsr.io/@std/expect/1.0.17/expect.ts:233:13)
at Object.<anonymous> (file:///home/dandv/deno-bug/toMatchObject.ts:5:49)
at fn (https://jsr.io/@std/testing/1.0.17/bdd.ts:598:20)
FAILURES
toMatchOBject should return fail message about matching, not equality => ./toMatchObject.ts:4:1
FAILED | 0 passed | 1 failed (12ms)
error: Test failed
```
**Expected behavior**
Jest fails with a much shorter, clearer, and accurate message, and a minimal diff:
```
FAIL tests/toMatchObject.test.ts
✕ toMatchOBject should return fail message about matching, not equality
expect(received).toMatchObject(expected)
- Expected - 1
+ Received + 1
Object {
"position": Object {
"x": Any<Number>,
- "y": Any<Number>,
+ "y": "string",
},
}
```
**Environment**
- OS: Ununtu 24
- deno version: 2.6.8
- std version: 1.0.17
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