Function TestTokenForID

pkg/util/traceid_test.go:204–240

(t *testing.T)

}

func TestTokenForID(t *testing.T) {
	h := NewTokenHasher()
	buf := make([]byte, 4)

	t.Run("unique token per kind", func(t *testing.T) {
		spanIDs := [][]byte{
			{0x60, 0xd8, 0xa9, 0xbd},
			{0x8e, 0xf6, 0x37, 0x90, 0x22, 0x57, 0xb7, 0x43},
			{0x18, 0xcc, 0xd9, 0x6d, 0x70, 0xc1, 0xbd, 0xf9},
		}
		for _, spanID := range spanIDs {
			seen := map[uint64]struct{}{}
			for kind := int32(0); kind < 8; kind++ {
				tok := TokenForID(h, buf, kind, spanID)
				_, exists := seen[tok]
				assert.False(t, exists, "token must be unique per span kind")
				seen[tok] = struct{}{}
			}
		}
	})

	t.Run("all bytes contribute", func(t *testing.T) {
		// IDs differing only beyond byte 8 must not collide.
		base := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}
		longer := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0xff}
		assert.NotEqual(t, TokenForID(h, buf, 0, base), TokenForID(h, buf, 0, longer))
	})

	t.Run("hasher reuse", func(t *testing.T) {
		// Reusing h and buf across calls must give stable results.
		spanID := []byte{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x11, 0x22}
		tok := TokenForID(h, buf, 0, spanID)
		for i := 0; i < 10; i++ {
			assert.Equal(t, tok, TokenForID(h, buf, 0, spanID))
		}
	})
}

func BenchmarkTokenForID(b *testing.B) {
	h := NewTokenHasher()