qbin 0.2.0

Encoding and decoding geographical coordinates to and from Quadbin, a hierarchical geospatial indexing system for square cells in Web Mercator projection developed by Carto. An improved version of Microsoft's Bing Maps Tile System, aka Quadkey.
Documentation 
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use crate::Cell;
use crate::errors::*;

#[test]
fn test_invalid_cellindex() {
    assert_eq!(
        Cell::try_from(5209574053332910078_u64).err(),
        Some(QuadbinError::InvalidCell(Some(5209574053332910078_u64)))
    );
    assert_eq!(
        Cell::try_from(5209574053332910079_u64)
            .expect("cell index")
            .get(),
        5209574053332910079_u64
    );
}

#[test]
fn test_cell_to_parent_invalid_resolution() {
    let cell = Cell::try_from(5209574053332910079).expect("cell index");
    let result = cell.parent(4);

    assert!(result.is_err());

    assert_eq!(result.err(), Some(QuadbinError::InvalidResolution(4)));
}

#[test]
fn test_invalid_cell_index() {
    let val: [u64; 2] = [5209574053332910078, 6362495557939757055];

    for i in val.iter() {
        let cell = Cell::try_from(*i);
        assert!(cell.is_err());

        assert_eq!(cell.err(), Some(QuadbinError::InvalidCell(Some(*i))));
    }
}

#[test]
fn test_invalid_child_res() {
    let cell = Cell::try_from(5209574053332910079).expect("cell index");

    // Resolution 3
    let kids = cell.children(3);
    assert!(kids.is_err());
    assert_eq!(kids.err(), Some(QuadbinError::InvalidResolution(3)));

    // Resolution 27
    let kids27 = cell.children(27);
    assert!(kids27.is_err());
    assert_eq!(kids27.err(), Some(QuadbinError::InvalidResolution(27)));
}