95c3c43072
Because TestUnmarshal actually allocates a new value to decode into using ptr's pointer type, any existing data is thrown away. This was harmless in alomst all of the test cases, minus the "overwriting of data" ones added in 2015 in CL 12209. I spotted that nothing covered decoding a JSON array with few elements into a slice which already had many elements. I initially assumed that the code was buggy or that some code could be removed, when in fact there simply wasn't any code covering the edge case. Move those two tests to TestPrefilled, which already served a very similar purpose. Remove the map case, as TestPrefilled already has plenty of prefilled map cases. Moreover, we no longer reset an entire map when decoding, as per the godoc: To unmarshal a JSON object into a map, Unmarshal first establishes a map to use. If the map is nil, Unmarshal allocates a new map. Otherwise Unmarshal reuses the existing map, keeping existing entries. Finally, to ensure that ptr is used correctly in the future, make TestUnmarshal error if it's anything other than a pointer to a zero value. That is, the only correct use should be new(type). Don't rename the ptr field, as that would be extremely noisy and cause unwanted merge conflicts. Change-Id: I41e3ecfeae42d877ac5443a6bd622ac3d6c8120c Reviewed-on: https://go-review.googlesource.com/c/go/+/185738 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com> |
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