58 lines
975 B
Go
58 lines
975 B
Go
package topk
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import (
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"fmt"
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"math/rand"
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"sort"
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"testing"
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)
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func TestTopK(t *testing.T) {
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stream := New(10)
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ss := []*Stream{New(10), New(10), New(10)}
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m := make(map[string]int)
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for _, s := range ss {
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for i := 0; i < 1e6; i++ {
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v := fmt.Sprintf("%x", int8(rand.ExpFloat64()))
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s.Insert(v)
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m[v]++
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}
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stream.Merge(s.Query())
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}
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var sm Samples
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for x, s := range m {
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sm = append(sm, &Element{x, s})
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}
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sort.Sort(sort.Reverse(sm))
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g := stream.Query()
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if len(g) != 10 {
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t.Fatalf("got %d, want 10", len(g))
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}
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for i, e := range g {
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if sm[i].Value != e.Value {
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t.Errorf("at %d: want %q, got %q", i, sm[i].Value, e.Value)
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}
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}
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}
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func TestQuery(t *testing.T) {
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queryTests := []struct {
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value string
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expected int
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}{
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{"a", 1},
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{"b", 2},
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{"c", 2},
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}
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stream := New(2)
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for _, tt := range queryTests {
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stream.Insert(tt.value)
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if n := len(stream.Query()); n != tt.expected {
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t.Errorf("want %d, got %d", tt.expected, n)
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}
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}
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}
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