93 lines
1.8 KiB
Go
93 lines
1.8 KiB
Go
package segments
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func LengthIterFromSlice(ls []Length) LengthIter {
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return func() (Length, bool) {
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switch len(ls) {
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case 0:
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return -1, false
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default:
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l := ls[0]
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ls = ls[1:]
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return l, true
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}
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}
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}
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type ScanCallbackValue struct {
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Index int
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Extent
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}
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type collectExtents []ScanCallbackValue
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func (me *collectExtents) scanCallback(i int, e Extent) bool {
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*me = append(*me, ScanCallbackValue{
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Index: i,
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Extent: e,
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})
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return true
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}
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type newLocater func(LengthIter) Locater
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func assertLocate(t *testing.T, nl newLocater, ls []Length, needle Extent, firstExpectedIndex int, expectedExtents []Extent) {
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var actual collectExtents
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var expected collectExtents
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for i, e := range expectedExtents {
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expected.scanCallback(firstExpectedIndex+i, e)
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}
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nl(LengthIterFromSlice(ls))(needle, actual.scanCallback)
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assert.EqualValues(t, expected, actual)
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}
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func testLocater(t *testing.T, newLocater newLocater) {
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assertLocate(t, newLocater,
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[]Length{1, 0, 2, 0, 3},
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Extent{2, 2},
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2,
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[]Extent{{1, 1}, {0, 0}, {0, 1}})
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assertLocate(t, newLocater,
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[]Length{1, 0, 2, 0, 3},
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Extent{6, 2},
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2,
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[]Extent{})
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assertLocate(t, newLocater,
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[]Length{1652, 1514, 1554, 1618, 1546, 129241752, 1537}, // 128737588
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Extent{0, 16384},
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0,
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[]Extent{
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{0, 1652},
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{0, 1514},
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{0, 1554},
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{0, 1618},
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{0, 1546},
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{0, 8500},
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})
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assertLocate(t, newLocater,
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[]Length{1652, 1514, 1554, 1618, 1546, 129241752, 1537, 1536, 1551}, // 128737588
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Extent{129236992, 16384},
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5,
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[]Extent{
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{129229108, 12644},
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{0, 1537},
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{0, 1536},
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{0, 667},
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})
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}
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func TestScan(t *testing.T) {
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testLocater(t, LocaterFromLengthIter)
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}
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func TestIndex(t *testing.T) {
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testLocater(t, func(li LengthIter) Locater {
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return NewIndex(li).Locate
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})
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}
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