mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-04 10:57:50 +08:00
6e36058d0a
- Use reflection to derive function name. - Take test cases as variadic arguments, instead of requiring them to be wrapped in a Table. - Support naming test cases. - Run test cases as subtests with t.Run.
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
package vals
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import (
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"math"
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"math/big"
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"os"
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"testing"
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"unsafe"
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"src.elv.sh/pkg/persistent/hash"
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"src.elv.sh/pkg/persistent/hashmap"
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"src.elv.sh/pkg/tt"
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)
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type hasher struct{}
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func (hasher) Hash() uint32 { return 42 }
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type nonHasher struct{}
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func TestHash(t *testing.T) {
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z := big.NewInt(5)
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z.Lsh(z, 8*uint(unsafe.Sizeof(int(0))))
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z.Add(z, big.NewInt(9))
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// z = 5 << wordSize + 9
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tt.Test(t, Hash,
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Args(false).Rets(uint32(0)),
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Args(true).Rets(uint32(1)),
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Args(1).Rets(uint32(1)),
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Args(z).Rets(hash.DJB(1, 9, 5)),
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Args(big.NewRat(3, 2)).Rets(hash.DJB(Hash(big.NewInt(3)), Hash(big.NewInt(2)))),
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Args(1.0).Rets(hash.UInt64(math.Float64bits(1.0))),
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Args("foo").Rets(hash.String("foo")),
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Args(os.Stdin).Rets(hash.UIntPtr(os.Stdin.Fd())),
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Args(MakeList("foo", "bar")).Rets(hash.DJB(Hash("foo"), Hash("bar"))),
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Args(MakeMap("foo", "bar")).
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Rets(hash.DJB(Hash("foo"), Hash("bar"))),
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Args(hasher{}).Rets(uint32(42)),
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Args(nonHasher{}).Rets(uint32(0)),
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)
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}
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func TestHash_EqualMapsWithDifferentInternal(t *testing.T) {
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// The internal representation of maps with the same value is not always the
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// same: when some keys of the map have the same hash, their values are
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// stored in the insertion order.
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//
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// To reliably test this case, we construct maps with a custom hashing
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// function.
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m0 := hashmap.New(Equal, func(v any) uint32 { return 0 })
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m1 := m0.Assoc("k1", "v1").Assoc("k2", "v2")
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m2 := m0.Assoc("k2", "v2").Assoc("k1", "v1")
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if h1, h2 := Hash(m1), Hash(m2); h1 != h2 {
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t.Errorf("%v != %v", h1, h2)
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}
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}
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