Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

geo/geohash_test.go

@@ -0,0 +1,64 @@
+//  Copyright (c) 2019 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package geo
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestDecodeGeoHash(t *testing.T) {
+	tests := []struct {
+		hash string
+		lon  float64
+		lat  float64
+	}{
+		{"d3hn3", -73.059082, 6.745605},     // -73.05908203, 6.74560547 as per http://geohash.co/
+		{"u4pru", 10.393066, 57.634277},     // 10.39306641, 57.63427734
+		{"u4pruy", 10.409546, 57.648010},    // 10.40954590, 57.64801025
+		{"u4pruyd", 10.407486, 57.648697},   // 10.40748596, 57.64869690
+		{"u4pruydqqvj", 10.40744, 57.64911}, // 10.40743969, 57.64911063
+	}
+
+	for _, test := range tests {
+		lat, lon := DecodeGeoHash(test.hash)
+
+		if compareGeo(test.lon, lon) != 0 {
+			t.Errorf("expected lon %f, got %f, hash %s", test.lon, lon, test.hash)
+		}
+		if compareGeo(test.lat, lat) != 0 {
+			t.Errorf("expected lat %f, got %f, hash %s", test.lat, lat, test.hash)
+		}
+	}
+}
+
+func TestEncodeGeoHash(t *testing.T) {
+	tests := []struct {
+		lon  float64
+		lat  float64
+		hash string
+	}{
+		{2.29449034, 48.85841131, "u09tunquc"},
+		{76.491540, 10.060349, "t9y3hx7my0fp"},
+	}
+
+	for _, test := range tests {
+		hash := EncodeGeoHash(test.lat, test.lon)
+
+		if !strings.HasPrefix(hash, test.hash) {
+			t.Errorf("expected hash %s, got %s", test.hash, hash)
+		}
+	}
+}