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hash/maphash: add more tests for seed generation

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Test all the paths by which a Hash picks its seed.
Make sure they all behave identically to a preset seed.

Change-Id: I2f7950857697f2f07226b96655574c36931b2aae
Reviewed-on: https://go-review.googlesource.com/c/go/+/220686
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Vladimir Evgrafov <evgrafov.vladimir@gmail.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Keith Randall 2020-02-23 19:23:15 -08:00
parent d7c073ecbf
commit bef0b4ea8f
1 changed files with 56 additions and 0 deletions
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56
src/hash/maphash/maphash_test.go
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@ -106,6 +106,62 @@ func TestRepeat(t *testing.T) {
}
}
func TestSeedFromSum64(t *testing.T) {
h1 := new(Hash)
h1.WriteString("foo")
x := h1.Sum64() // seed generated here
h2 := new(Hash)
h2.SetSeed(h1.Seed())
h2.WriteString("foo")
y := h2.Sum64()
if x != y {
t.Errorf("hashes don't match: want %x, got %x", x, y)
}
}
func TestSeedFromSeed(t *testing.T) {
h1 := new(Hash)
h1.WriteString("foo")
_ = h1.Seed() // seed generated here
x := h1.Sum64()
h2 := new(Hash)
h2.SetSeed(h1.Seed())
h2.WriteString("foo")
y := h2.Sum64()
if x != y {
t.Errorf("hashes don't match: want %x, got %x", x, y)
}
}
func TestSeedFromFlush(t *testing.T) {
b := make([]byte, 65)
h1 := new(Hash)
h1.Write(b) // seed generated here
x := h1.Sum64()
h2 := new(Hash)
h2.SetSeed(h1.Seed())
h2.Write(b)
y := h2.Sum64()
if x != y {
t.Errorf("hashes don't match: want %x, got %x", x, y)
}
}
func TestSeedFromReset(t *testing.T) {
h1 := new(Hash)
h1.WriteString("foo")
h1.Reset() // seed generated here
h1.WriteString("foo")
x := h1.Sum64()
h2 := new(Hash)
h2.SetSeed(h1.Seed())
h2.WriteString("foo")
y := h2.Sum64()
if x != y {
t.Errorf("hashes don't match: want %x, got %x", x, y)
}
}
// Make sure a Hash implements the hash.Hash and hash.Hash64 interfaces.
var _ hash.Hash = &Hash{}
var _ hash.Hash64 = &Hash{}