fn test_try_from_headers()

in src/common/headers.rs [524:579]

• 51 lines of code
• 1 McCabe index (conditional complexity)

    fn test_try_from_headers() {
        // Valid headers.
        let headers =  Headers::try_from(
            b"Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT\r\nAccept: application/json\r\nContent-Length: 55\r\n\r\n"
        )
            .unwrap();
        assert_eq!(headers.content_length, 55);
        assert_eq!(headers.accept, MediaType::ApplicationJson);
        assert_eq!(
            headers.custom_entries().get("Last-Modified").unwrap(),
            "Tue, 15 Nov 1994 12:45:26 GMT"
        );
        assert_eq!(headers.custom_entries().len(), 1);

        // Valid headers. (${HEADER_NAME} : WHITESPACE ${HEADER_VALUE})
        // Any number of whitespace characters should be accepted including zero.
        let headers =  Headers::try_from(
            b"Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT\r\nAccept:text/plain\r\nContent-Length:   49\r\n\r\n"
        )
            .unwrap();
        assert_eq!(headers.content_length, 49);
        assert_eq!(headers.accept, MediaType::PlainText);

        // Valid headers.
        let headers = Headers::try_from(
            b"Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT\r\nContent-Length: 29\r\n\r\n",
        )
        .unwrap();
        assert_eq!(headers.content_length, 29);

        // Custom headers only.
        let headers = Headers::try_from(
            b"Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT\r\nfoo: bar\r\nbar: 15\r\n\r\n",
        )
        .unwrap();
        let custom_entries = headers.custom_entries();
        assert_eq!(custom_entries.get("foo").unwrap(), "bar");
        assert_eq!(custom_entries.get("bar").unwrap(), "15");
        assert_eq!(custom_entries.len(), 3);

        // Valid headers, invalid value.
        assert_eq!(
            Headers::try_from(
                b"Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT\r\nContent-Length: -55\r\n\r\n"
            )
            .unwrap_err(),
            RequestError::HeaderError(HttpHeaderError::InvalidValue(
                "Content-Length".to_string(),
                " -55".to_string()
            ))
        );

        let bytes: [u8; 10] = [130, 140, 150, 130, 140, 150, 130, 140, 150, 160];
        // Invalid headers.
        assert!(Headers::try_from(&bytes[..]).is_err());
    }