vertx / io.vertx.rxjava.ext.unit / TestContext / assertNull

# assertNull

`open fun assertNull(expected: Any): TestContext`

Assert the `expected` argument is `null`. If the argument is not, an assertion error is thrown otherwise the execution continue.

### Parameters

`expected` - the argument being asserted to be null

Return
a reference to this, so the API can be used fluently

`open fun assertNull(expected: Any, message: String): TestContext`

Assert the `expected` argument is `null`. If the argument is not, an assertion error is thrown otherwise the execution continue.

### Parameters

`expected` - the argument being asserted to be null

`message` - the failure message

Return
a reference to this, so the API can be used fluently