mirror of
https://github.com/navidrome/navidrome.git
synced 2025-04-03 20:47:35 +03:00
50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package utils
|
|
|
|
import (
|
|
. "github.com/onsi/ginkgo/v2"
|
|
. "github.com/onsi/gomega"
|
|
)
|
|
|
|
var _ = Describe("WeightedRandomChooser", func() {
|
|
var w *WeightedChooser
|
|
BeforeEach(func() {
|
|
w = NewWeightedRandomChooser()
|
|
for i := 0; i < 10; i++ {
|
|
w.Put(i, i)
|
|
}
|
|
})
|
|
|
|
It("removes a random item", func() {
|
|
Expect(w.Size()).To(Equal(10))
|
|
_, err := w.GetAndRemove()
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(w.Size()).To(Equal(9))
|
|
})
|
|
|
|
It("returns the sole item", func() {
|
|
w = NewWeightedRandomChooser()
|
|
w.Put("a", 1)
|
|
Expect(w.GetAndRemove()).To(Equal("a"))
|
|
})
|
|
|
|
It("fails when trying to choose from empty set", func() {
|
|
w = NewWeightedRandomChooser()
|
|
w.Put("a", 1)
|
|
w.Put("b", 1)
|
|
Expect(w.GetAndRemove()).To(BeElementOf("a", "b"))
|
|
Expect(w.GetAndRemove()).To(BeElementOf("a", "b"))
|
|
_, err := w.GetAndRemove()
|
|
Expect(err).To(HaveOccurred())
|
|
})
|
|
|
|
It("chooses based on weights", func() {
|
|
counts := [10]int{}
|
|
for i := 0; i < 200000; i++ {
|
|
c, _ := w.weightedChoice()
|
|
counts[c] = counts[c] + 1
|
|
}
|
|
for i := 0; i < 9; i++ {
|
|
Expect(counts[i]).To(BeNumerically("<", counts[i+1]))
|
|
}
|
|
})
|
|
})
|