find-stone-beer / files / coord-round_test.go

coord-round_test.go

1	package main
2
3	import (
4	"testing"
5
6	"github.com/jftuga/geodist"
7	"github.com/stretchr/testify/assert"
8	)
9
10	func TestCoordRound(t *testing.T) {
11	// 47.6254333,-122.1632314
12
13	assert.Equal(t, "1.06in", getPrecisionDistance(t, geodist.Coord{Lat: 47.6254333, Lon: -122.1632314}).ToString())
14	assert.Equal(t, "10.57in", getPrecisionDistance(t, geodist.Coord{Lat: 47.625433, Lon: -122.163231}).ToString())
15	assert.Equal(t, "5.92in", getPrecisionDistance(t, geodist.Coord{Lat: 47.625433111111, Lon: -122.163231}).ToString())
16	assert.Equal(t, "880.62ft", getPrecisionDistance(t, geodist.Coord{Lat: 47.625, Lon: -122.163}).ToString())
17	assert.Equal(t, "167.38mi", getPrecisionDistance(t, geodist.Coord{Lat: 47, Lon: -122}).ToString())
18
19	coord := geodist.Coord{Lat: 47.6254333, Lon: -122.1632314}
20	roundingDistance := ImperialDistance{Miles: 0.25}
21	roundedCoord, err := RoundCoord(coord, roundingDistance)
22	assert.Nil(t, err)
23	precisionDistance := getPrecisionDistance(t, roundedCoord)
24	assert.Greater(t, precisionDistance.Miles, roundingDistance.Miles)
25	}
26
27	func getPrecisionDistance(t *testing.T, coord geodist.Coord) ImperialDistance {
28	latDelta := getDelta(coord.Lat)
29	minLat := coord.Lat - latDelta
30	maxLat := coord.Lat + latDelta
31
32	lonDelta := getDelta(coord.Lon)
33	minLon := coord.Lon - lonDelta
34	maxLon := coord.Lon + lonDelta
35
36	minCoord := geodist.Coord{Lat: minLat, Lon: minLon}
37	maxCoord := geodist.Coord{Lat: maxLat, Lon: maxLon}
38	distMiles, _, err := geodist.VincentyDistance(minCoord, maxCoord)
39	assert.Nil(t, err)
40	id := ImperialDistance{Miles: distMiles}
41	return id
42	}