Adding upstream version 2.5.1.

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

index/scorch/int_test.go

@@ -0,0 +1,96 @@
+// Copyright 2014 The Cockroach Authors.
+//
+// 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.
+
+// This code originated from:
+// https://github.com/cockroachdb/cockroach/blob/2dd65dde5d90c157f4b93f92502ca1063b904e1d/pkg/util/encoding/encoding_test.go
+
+// Modified to only test the parts we borrowed
+
+package scorch
+
+import (
+	"bytes"
+	"math"
+	"testing"
+)
+
+type testCaseUint64 struct {
+	value  uint64
+	expEnc []byte
+}
+
+func TestEncodeDecodeUvarint(t *testing.T) {
+	testBasicEncodeDecodeUint64(encodeUvarintAscending, decodeUvarintAscending, false, t)
+	testCases := []testCaseUint64{
+		{0, []byte{0x88}},
+		{1, []byte{0x89}},
+		{109, []byte{0xf5}},
+		{110, []byte{0xf6, 0x6e}},
+		{1 << 8, []byte{0xf7, 0x01, 0x00}},
+		{math.MaxUint64, []byte{0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}},
+	}
+	testCustomEncodeUint64(testCases, encodeUvarintAscending, t)
+}
+
+func testBasicEncodeDecodeUint64(
+	encFunc func([]byte, uint64) []byte,
+	decFunc func([]byte) ([]byte, uint64, error),
+	descending bool, t *testing.T,
+) {
+	testCases := []uint64{
+		0, 1,
+		1<<8 - 1, 1 << 8,
+		1<<16 - 1, 1 << 16,
+		1<<24 - 1, 1 << 24,
+		1<<32 - 1, 1 << 32,
+		1<<40 - 1, 1 << 40,
+		1<<48 - 1, 1 << 48,
+		1<<56 - 1, 1 << 56,
+		math.MaxUint64 - 1, math.MaxUint64,
+	}
+
+	var lastEnc []byte
+	for i, v := range testCases {
+		enc := encFunc(nil, v)
+		if i > 0 {
+			if (descending && bytes.Compare(enc, lastEnc) >= 0) ||
+				(!descending && bytes.Compare(enc, lastEnc) < 0) {
+				t.Errorf("ordered constraint violated for %d: [% x] vs. [% x]", v, enc, lastEnc)
+			}
+		}
+		b, decode, err := decFunc(enc)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if len(b) != 0 {
+			t.Errorf("leftover bytes: [% x]", b)
+		}
+		if decode != v {
+			t.Errorf("decode yielded different value than input: %d vs. %d", decode, v)
+		}
+		lastEnc = enc
+	}
+}
+
+func testCustomEncodeUint64(
+	testCases []testCaseUint64, encFunc func([]byte, uint64) []byte, t *testing.T,
+) {
+	for _, test := range testCases {
+		enc := encFunc(nil, test.value)
+		if !bytes.Equal(enc, test.expEnc) {
+			t.Errorf("expected [% x]; got [% x] (value: %d)", test.expEnc, enc, test.value)
+		}
+	}
+}