+++ /dev/null
-// Copyright (c) 2013-2017 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-package blockchain
-
-import (
- "strconv"
- "testing"
- "time"
-)
-
-// TestMedianTime tests the medianTime implementation.
-func TestMedianTime(t *testing.T) {
- tests := []struct {
- in []int64
- wantOffset int64
- useDupID bool
- }{
- // Not enough samples must result in an offset of 0.
- {in: []int64{1}, wantOffset: 0},
- {in: []int64{1, 2}, wantOffset: 0},
- {in: []int64{1, 2, 3}, wantOffset: 0},
- {in: []int64{1, 2, 3, 4}, wantOffset: 0},
-
- // Various number of entries. The expected offset is only
- // updated on odd number of elements.
- {in: []int64{-13, 57, -4, -23, -12}, wantOffset: -12},
- {in: []int64{55, -13, 61, -52, 39, 55}, wantOffset: 39},
- {in: []int64{-62, -58, -30, -62, 51, -30, 15}, wantOffset: -30},
- {in: []int64{29, -47, 39, 54, 42, 41, 8, -33}, wantOffset: 39},
- {in: []int64{37, 54, 9, -21, -56, -36, 5, -11, -39}, wantOffset: -11},
- {in: []int64{57, -28, 25, -39, 9, 63, -16, 19, -60, 25}, wantOffset: 9},
- {in: []int64{-5, -4, -3, -2, -1}, wantOffset: -3, useDupID: true},
-
- // The offset stops being updated once the max number of entries
- // has been reached. This is actually a bug from Bitcoin Core,
- // but since the time is ultimately used as a part of the
- // consensus rules, it must be mirrored.
- {in: []int64{-67, 67, -50, 24, 63, 17, 58, -14, 5, -32, -52}, wantOffset: 17},
- {in: []int64{-67, 67, -50, 24, 63, 17, 58, -14, 5, -32, -52, 45}, wantOffset: 17},
- {in: []int64{-67, 67, -50, 24, 63, 17, 58, -14, 5, -32, -52, 45, 4}, wantOffset: 17},
-
- // Offsets that are too far away from the local time should
- // be ignored.
- {in: []int64{-4201, 4202, -4203, 4204, -4205}, wantOffset: 0},
-
- // Excerise the condition where the median offset is greater
- // than the max allowed adjustment, but there is at least one
- // sample that is close enough to the current time to avoid
- // triggering a warning about an invalid local clock.
- {in: []int64{4201, 4202, 4203, 4204, -299}, wantOffset: 0},
- }
-
- // Modify the max number of allowed median time entries for these tests.
- maxMedianTimeEntries = 10
- defer func() { maxMedianTimeEntries = 200 }()
-
- for i, test := range tests {
- filter := NewMedianTime()
- for j, offset := range test.in {
- id := strconv.Itoa(j)
- now := time.Unix(time.Now().Unix(), 0)
- tOffset := now.Add(time.Duration(offset) * time.Second)
- filter.AddTimeSample(id, tOffset)
-
- // Ensure the duplicate IDs are ignored.
- if test.useDupID {
- // Modify the offsets to ensure the final median
- // would be different if the duplicate is added.
- tOffset = tOffset.Add(time.Duration(offset) *
- time.Second)
- filter.AddTimeSample(id, tOffset)
- }
- }
-
- // Since it is possible that the time.Now call in AddTimeSample
- // and the time.Now calls here in the tests will be off by one
- // second, allow a fudge factor to compensate.
- gotOffset := filter.Offset()
- wantOffset := time.Duration(test.wantOffset) * time.Second
- wantOffset2 := time.Duration(test.wantOffset-1) * time.Second
- if gotOffset != wantOffset && gotOffset != wantOffset2 {
- t.Errorf("Offset #%d: unexpected offset -- got %v, "+
- "want %v or %v", i, gotOffset, wantOffset,
- wantOffset2)
- continue
- }
-
- // Since it is possible that the time.Now call in AdjustedTime
- // and the time.Now call here in the tests will be off by one
- // second, allow a fudge factor to compensate.
- adjustedTime := filter.AdjustedTime()
- now := time.Unix(time.Now().Unix(), 0)
- wantTime := now.Add(filter.Offset())
- wantTime2 := now.Add(filter.Offset() - time.Second)
- if !adjustedTime.Equal(wantTime) && !adjustedTime.Equal(wantTime2) {
- t.Errorf("AdjustedTime #%d: unexpected result -- got %v, "+
- "want %v or %v", i, adjustedTime, wantTime,
- wantTime2)
- continue
- }
- }
-}
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