# `test.assertion_failed`

Test assertion does not hold.

Area 13, [Testing](../topics/testing.md); not declinable; the next step is usually the agent's.

An `assert` whose condition is false, or an `assert … fails` whose call
returned or failed differently. Records are compared field by field:


```jadpo
test "a new draft has normal priority" {
    var fresh: TodoDraft = draft("Buy milk")
    assert fresh == TodoDraft {
        title: "Buy milk"
        priority: 2
    }
}
```

```text
FAIL  a new draft has normal priority
 --> todos.test.jadpo:3

  assert fresh == TodoDraft { ...
         |        |
         |        TodoDraft { title: "Buy milk", priority: 2 }
         TodoDraft { title: "Buy milk", priority: 3 }

  expected: TodoDraft { title: "Buy milk", priority: 2 }
  actual: TodoDraft { title: "Buy milk", priority: 3 }
  diff: ~ priority: expected 2, actual 3

  rule: test.assertion_failed
  rerun: jadpo test todos.test.jadpo:3 --seed 1

test failed: 1 failed, 1 pure test
```