src/Context/Form/FormContext.php
public function fillInWithValueOfFieldOfCurrentUser($field, $user_field)
    {
        if (!empty($this->user) && !$this->user->uid) {
            throw new \Exception('Anonymous user have no fields');
        }

        $entity = new EntityDrupalWrapper('user');
        $wrapper = $entity->wrapper($this->user->uid);
        $user_field = $entity->getFieldNameByLocator($user_field);

        if (empty($wrapper->{$user_field})) {
            throw new \InvalidArgumentException(sprintf('User entity has no "%s" field.', $user_field));
        }

        $value = $wrapper->{$user_field}->value();

        if (empty($value)) {
            throw new \UnexpectedValueException('The value of "%s" field is empty.', $user_field);
        }

        $this->fillField($field, $value);
    }
public function fillInWithValueOfFieldOfCurrentUser($field, $user_field)
    {
        if (!empty($this->user) && !$this->user->uid) {
            throw new \Exception('Anonymous user have no fields');
        }

        $entity = new EntityDrupalWrapper('user');
        $wrapper = $entity->wrapper($this->user->uid);
        $user_field = $entity->getFieldNameByLocator($user_field);

        if (empty($wrapper->{$user_field})) {
            throw new \InvalidArgumentException(sprintf('User entity has no "%s" field.', $user_field));
        }

        $value = $wrapper->{$user_field}->value();

        if (empty($value)) {
            throw new \UnexpectedValueException('The value of "%s" field is empty.', $user_field);
        }

        $this->fillField($field, $value);
    }
Use the current user data for filling fields.

@example
Then I fill "First name" with value of field "First name" of current user
And fill "field_last_name[und][0]" with value of field "field_user_last_name" of current user

@param string $field
The name of field to fill in. HTML Label, name or ID can be user as selector.
@param string $user_field
The name of field from which the data will taken. Drupal label or machine name can be used as selector.

@throws \InvalidArgumentException
@throws \UnexpectedValueException
@throws \Exception
@throws NoSuchElement
When field cannot be found.

@Then /^(?:I )fill "([^"]*)" with value of field "([^"]*)" of current user$/