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test: empty root #288

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test: empty root #288

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33 changes: 22 additions & 11 deletions hasher_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -898,19 +898,30 @@ func TestComputeNsRange(t *testing.T) {
}
}

// TestEmptyRoot ensures that the empty root is always the same, under the same configuration, regardless of the state of the Hasher.
func TestEmptyRoot(t *testing.T) {
nIDSzie := 1
ignoreMaxNS := true
t.Run("the empty root should match a hard-coded empty root", func(t *testing.T) {
nIDSzie := 1
ignoreMaxNS := true

hasher := NewNmtHasher(sha256.New(), namespace.IDSize(nIDSzie), ignoreMaxNS)
got := hasher.EmptyRoot()
want := []byte{0x0, 0x0, 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55}
assert.Equal(t, want, got)
})

t.Run("empty root should return the same root even if the hasher is modified", func(t *testing.T) {
nIDSzie := 1
ignoreMaxNS := true

hasher := NewNmtHasher(sha256.New(), namespace.IDSize(nIDSzie), ignoreMaxNS)
expectedEmptyRoot := hasher.EmptyRoot()
hasher := NewNmtHasher(sha256.New(), namespace.IDSize(nIDSzie), ignoreMaxNS)
want := hasher.EmptyRoot()

// perform some operation with the hasher
_, err := hasher.HashNode(createByteSlice(hasher.Size(), 1), createByteSlice(hasher.Size(), 1))
assert.NoError(t, err)
gotEmptyRoot := hasher.EmptyRoot()
// perform some operation with the hasher
_, err := hasher.HashNode(createByteSlice(hasher.Size(), 1), createByteSlice(hasher.Size(), 1))
assert.NoError(t, err)
got := hasher.EmptyRoot()

// the empty root should be the same before and after the operation
assert.True(t, bytes.Equal(gotEmptyRoot, expectedEmptyRoot))
// the empty root should be the same before and after the operation
assert.Equal(t, want, got)
})
}
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