52 lines
1.4 KiB
Nim
52 lines
1.4 KiB
Nim
# Stint
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# Copyright 2018 Status Research & Development GmbH
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# Licensed under either of
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#
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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#
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import ../stint, unittest
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suite "Testing signed addition implementation":
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test "In-place addition gives expected result":
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var a = 20182018.stint(64)
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let b = 20172017.stint(64)
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a += b
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check: cast[int64](a) == 20182018'i64 + 20172017'i64
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test "Addition gives expected result":
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let a = 20182018.stint(64)
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let b = 20172017.stint(64)
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check: cast[int64](a+b) == 20182018'i64 + 20172017'i64
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test "When the low half overflows, it is properly carried":
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# uint8 (low half) overflow at 255
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let a = 100'i16.stint(16)
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let b = 100'i16.stint(16)
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check: cast[int16](a+b) == 200
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suite "Testing signed substraction implementation":
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test "In-place substraction gives expected result":
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var a = 20182018.stint(64)
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let b = 20172017.stint(64)
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a -= b
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check: cast[int64](a) == 20182018'i64 - 20172017'i64
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test "Substraction gives expected result":
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let a = 20182018.stint(64)
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let b = 20172017.stint(64)
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check: cast[int64](a-b) == 20182018'i64 - 20172017'i64
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