Merge pull request #809 from steveyen/TestRoaringSizes

added TestRoaringSizes()

index/scorch/segment/zap/write_test.go

@@ -0,0 +1,86 @@
+//  Copyright (c) 2018 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 zap
+
+import (
+	"math"
+	"testing"
+
+	"github.com/RoaringBitmap/roaring"
+)
+
+func TestRoaringSizes(t *testing.T) {
+	tests := []struct {
+		vals          []uint32
+		expectedSize  int // expected serialized # bytes
+		optimizedSize int // after calling roaring's RunOptimize() API
+	}{
+		{[]uint32{}, 8, 8}, // empty roaring is 8 bytes
+
+		{[]uint32{0}, 18, 18}, // single entry roaring is 18 bytes
+		{[]uint32{1}, 18, 18},
+		{[]uint32{4}, 18, 18},
+		{[]uint32{4000}, 18, 18},
+		{[]uint32{40000000}, 18, 18},
+		{[]uint32{math.MaxUint32}, 18, 18},
+		{[]uint32{math.MaxUint32 - 1}, 18, 18},
+
+		{[]uint32{0, 1}, 20, 20},
+		{[]uint32{0, 10000000}, 28, 28},
+
+		{[]uint32{0, 1, 2}, 22, 15},
+		{[]uint32{0, 1, 20000000}, 30, 30},
+
+		{[]uint32{0, 1, 2, 3}, 24, 15},
+		{[]uint32{0, 1, 2, 30000000}, 32, 21},
+	}
+
+	for _, test := range tests {
+		bm := roaring.New()
+		for _, val := range test.vals {
+			bm.Add(val)
+		}
+
+		b, err := bm.ToBytes()
+		if err != nil {
+			t.Errorf("expected no ToBytes() err, got: %v", err)
+		}
+		if len(b) != test.expectedSize {
+			t.Errorf("size did not match,"+
+				" got: %d, test: %#v", len(b), test)
+		}
+		if int(bm.GetSerializedSizeInBytes()) != test.expectedSize {
+			t.Errorf("GetSerializedSizeInBytes did not match,"+
+				" got: %d, test: %#v",
+				bm.GetSerializedSizeInBytes(), test)
+		}
+
+		bm.RunOptimize()
+
+		b, err = bm.ToBytes()
+		if err != nil {
+			t.Errorf("expected no ToBytes() err, got: %v", err)
+		}
+		if len(b) != test.optimizedSize {
+			t.Errorf("optimized size did not match,"+
+				" got: %d, test: %#v", len(b), test)
+		}
+		if int(bm.GetSerializedSizeInBytes()) != test.optimizedSize {
+			t.Errorf("optimized GetSerializedSizeInBytes did not match,"+
+				" got: %d, test: %#v",
+				bm.GetSerializedSizeInBytes(), test)
+		}
+	}
+}