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encoding_test.go
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encoding_test.go
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package spatial
import (
"encoding/json"
"testing"
_ "github.com/lib/pq"
"github.com/stretchr/testify/assert"
)
func TestPointEncodeExact(t *testing.T) {
precision := 6
path := []Point{
Point{
Lat: 38.796006,
Lng: -121.314648,
},
Point{
Lat: 38.804000,
Lng: -121.353282,
},
}
polyline := Encode(path, precision)
assert.NotEqual(t, "", polyline)
assert.Equal(t, "km|~hAntmkfFsrNrmjA", polyline)
points, err := Decode(polyline, precision)
assert.NoError(t, err)
assert.Equal(t, path, points)
}
func TestPointEncodingPrecisionRound(t *testing.T) {
precision := 5
path := []Point{
Point{
Lat: 38.796006,
Lng: -121.314648,
},
Point{
Lat: 38.804000,
Lng: -121.353282,
},
}
roundedPath := []Point{
Point{
Lat: 38.79601,
Lng: -121.31465,
},
Point{
Lat: 38.80400,
Lng: -121.35328,
},
}
polyline := Encode(path, precision)
assert.NotEqual(t, "", polyline)
assert.Equal(t, "ajxkFpgmcV}p@lpF", polyline)
points, err := Decode(polyline, precision)
assert.NoError(t, err)
assert.Equal(t, roundedPath, points)
}
func TestPointEncodingLength(t *testing.T) {
precision := 6
path := []Point{
Point{
Lat: 38.796006,
Lng: -121.314648,
},
Point{
Lat: 38.804000,
Lng: -121.353282,
},
}
polyline := Encode(path, precision)
jsonPoints, err := json.Marshal(path)
if err != nil {
assert.Error(t, err)
}
assert.True(t, len(polyline) < len(jsonPoints))
}