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