103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
// Copyright 2017 The Bazel Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package starlark
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import (
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"fmt"
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"math"
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"math/big"
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"testing"
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)
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// TestIntOpts exercises integer arithmetic, especially at the boundaries.
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func TestIntOpts(t *testing.T) {
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f := MakeInt64
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left, right := big.NewInt(math.MinInt32), big.NewInt(math.MaxInt32)
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for i, test := range []struct {
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val Int
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want string
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}{
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// Add
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{f(math.MaxInt32).Add(f(1)), "80000000"},
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{f(math.MinInt32).Add(f(-1)), "-80000001"},
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// Mul
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{f(math.MaxInt32).Mul(f(math.MaxInt32)), "3fffffff00000001"},
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{f(math.MinInt32).Mul(f(math.MinInt32)), "4000000000000000"},
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{f(math.MaxUint32).Mul(f(math.MaxUint32)), "fffffffe00000001"},
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{f(math.MinInt32).Mul(f(-1)), "80000000"},
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// Div
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{f(math.MinInt32).Div(f(-1)), "80000000"},
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{f(1 << 31).Div(f(2)), "40000000"},
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// And
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{f(math.MaxInt32).And(f(math.MaxInt32)), "7fffffff"},
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{f(math.MinInt32).And(f(math.MinInt32)), "-80000000"},
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{f(1 << 33).And(f(1 << 32)), "0"},
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// Mod
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{f(1 << 32).Mod(f(2)), "0"},
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// Or
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{f(1 << 32).Or(f(0)), "100000000"},
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{f(math.MaxInt32).Or(f(0)), "7fffffff"},
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{f(math.MaxUint32).Or(f(0)), "ffffffff"},
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{f(math.MinInt32).Or(f(math.MinInt32)), "-80000000"},
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// Xor
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{f(math.MinInt32).Xor(f(-1)), "7fffffff"},
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// Not
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{f(math.MinInt32).Not(), "7fffffff"},
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{f(math.MaxInt32).Not(), "-80000000"},
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// Shift
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{f(1).Lsh(31), "80000000"},
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{f(1).Lsh(32), "100000000"},
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{f(math.MaxInt32 + 1).Rsh(1), "40000000"},
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{f(math.MinInt32 * 2).Rsh(1), "-80000000"},
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} {
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if got := fmt.Sprintf("%x", test.val); got != test.want {
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t.Errorf("%d equals %s, want %s", i, got, test.want)
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}
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small, big := test.val.get()
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if small < math.MinInt32 || math.MaxInt32 < small {
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t.Errorf("expected big, %d %s", i, test.val)
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}
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if big == nil {
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continue
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}
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if small != 0 {
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t.Errorf("expected 0 small, %d %s with %d", i, test.val, small)
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}
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if big.Cmp(left) >= 0 && big.Cmp(right) <= 0 {
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t.Errorf("expected small, %d %s", i, test.val)
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}
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}
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}
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func TestImmutabilityMakeBigInt(t *testing.T) {
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// use max int64 for the test
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expect := int64(^uint64(0) >> 1)
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mutint := big.NewInt(expect)
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value := MakeBigInt(mutint)
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mutint.Set(big.NewInt(1))
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got, _ := value.Int64()
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if got != expect {
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t.Errorf("expected %d, got %d", expect, got)
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}
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}
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func TestImmutabilityBigInt(t *testing.T) {
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// use 1 and max int64 for the test
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for _, expect := range []int64{1, int64(^uint64(0) >> 1)} {
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value := MakeBigInt(big.NewInt(expect))
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bigint := value.BigInt()
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bigint.Set(big.NewInt(2))
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got, _ := value.Int64()
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if got != expect {
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t.Errorf("expected %d, got %d", expect, got)
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}
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}
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}
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