EmailHasHeader example

        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);
    }

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

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