EmailHtmlBodyContains example

        self::assertThat($email, new MimeConstraint\EmailTextBodyContains($text), $message);
    }

    public static function assertEmailTextBodyNotContains(RawMessage $email, string $text, string $message = ''): void
    {
        self::assertThat($email, new LogicalNot(new MimeConstraint\EmailTextBodyContains($text)), $message);
    }

    public static function assertEmailHtmlBodyContains(RawMessage $email, string $text, string $message = ''): void
    {
        self::assertThat($email, new MimeConstraint\EmailHtmlBodyContains($text), $message);
    }

    public static function assertEmailHtmlBodyNotContains(RawMessage $email, string $text, string $message = ''): void
    {
        self::assertThat($email, new LogicalNot(new MimeConstraint\EmailHtmlBodyContains($text)), $message);
    }

    public static function assertEmailHasHeader(RawMessage $email, string $headerName, string $message = ''): void
    {
        self::assertThat($email, new MimeConstraint\EmailHasHeader($headerName), $message);
    }