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