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int_test.go
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package safeconversion_test
import (
"errors"
"math"
"testing"
"github.com/corentings/safeconversion"
)
func TestCastInt(t *testing.T) {
t.Run("int to uint", testCastInt[int, uint](42, 42, false, nil))
t.Run("uint to int", testCastInt[uint, int](42, 42, false, nil))
t.Run("int8 to int16", testCastInt[int8, int16](127, 127, false, nil))
t.Run("uint16 to uint32", testCastInt[uint16, uint32](65535, 65535, false, nil))
t.Run("int32 to int64", testCastInt[int32, int64](2147483647, 2147483647, false, nil))
t.Run("uint64 to uint", testCastInt[uint64, uint](18446744073709551615, 18446744073709551615, false, nil))
t.Run("int to int8 (error)", testCastInt[int, int8](300, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint to int8 (error)", testCastInt[uint, int8](300, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int8 to uint16 (no error)", testCastInt[int8, uint16](127, 127, false, nil))
t.Run("uint16 to int8 (overflow)", testCastInt[uint16, int8](256, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint16 to int8 (in range)", testCastInt[uint16, int8](127, 127, false, nil))
t.Run("int8 to uint16 (error)", testCastInt[int8, uint16](-128, 0, true, safeconversion.ErrValueOutOfRange))
// Additional boundary cases
t.Run("int8 max to uint8", testCastInt[int8, uint8](127, 127, false, nil))
t.Run("int8 min to uint8", testCastInt[int8, uint8](-128, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint8 max to int8", testCastInt[uint8, int8](255, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int16 max to uint16", testCastInt[int16, uint16](32767, 32767, false, nil))
t.Run("int16 min to uint16", testCastInt[int16, uint16](-32768, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint16 max to int16", testCastInt[uint16, int16](65535, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int32 max to uint32", testCastInt[int32, uint32](2147483647, 2147483647, false, nil))
t.Run("int32 min to uint32", testCastInt[int32, uint32](-2147483648, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint32 max to int32", testCastInt[uint32, int32](4294967295, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int64 max to uint64", testCastInt[int64, uint64](9223372036854775807, 9223372036854775807, false, nil))
t.Run("int64 min to uint64", testCastInt[int64, uint64](-9223372036854775808, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint64 max to int64", testCastInt[uint64, int64](18446744073709551615, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int to uint8 (max)", testCastInt[int, uint8](math.MaxUint8, math.MaxUint8, false, nil))
t.Run("int to uint8 (overflow)", testCastInt[int, uint8](math.MaxUint8+1, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("int to int8 (min)", testCastInt[int, int8](math.MinInt8, math.MinInt8, false, nil))
t.Run("int to int8 (underflow)", testCastInt[int, int8](-129, 0, true, safeconversion.ErrValueOutOfRange))
t.Run("uint to int (max 32-bit)", testCastInt[uint, int](math.MaxInt32, math.MaxInt32, false, nil))
t.Run("int64 to uint32 (max)", testCastInt[int64, uint32](math.MaxUint32, math.MaxUint32, false, nil))
t.Run("int64 to uint32 (overflow)", testCastInt[int64, uint32](math.MaxUint32+1, 0, true, safeconversion.ErrValueOutOfRange))
}
func FuzzCastInt(f *testing.F) {
f.Add(int(0))
f.Add(int(1))
f.Add(int(-1))
f.Add(int(math.MaxInt64))
f.Add(int(math.MinInt64))
f.Fuzz(func(t *testing.T, input int) {
testCastIntFuzz[int, int](t, input)
testCastIntFuzz[int, int8](t, input)
testCastIntFuzz[int, int16](t, input)
testCastIntFuzz[int, int32](t, input)
testCastIntFuzz[int, int64](t, input)
testCastUintFuzz[int, uint](t, input)
testCastUintFuzz[int, uint8](t, input)
testCastUintFuzz[int, uint16](t, input)
testCastUintFuzz[int, uint32](t, input)
testCastUintFuzz[int, uint64](t, input)
})
}
func FuzzCastInt32(f *testing.F) {
f.Add(int32(0))
f.Add(int32(1))
f.Add(int32(-1))
f.Add(int32(math.MaxInt32))
f.Add(int32(math.MinInt32))
f.Fuzz(func(t *testing.T, input int32) {
testCastIntFuzz[int32, int](t, input)
testCastIntFuzz[int32, int8](t, input)
testCastIntFuzz[int32, int16](t, input)
testCastIntFuzz[int32, int32](t, input)
testCastIntFuzz[int32, int64](t, input)
testCastUintFuzz[int32, uint](t, input)
testCastUintFuzz[int32, uint8](t, input)
testCastUintFuzz[int32, uint16](t, input)
testCastUintFuzz[int32, uint32](t, input)
testCastUintFuzz[int32, uint64](t, input)
})
}
func FuzzCastInt64(f *testing.F) {
f.Add(int64(0))
f.Add(int64(1))
f.Add(int64(-1))
f.Add(int64(math.MaxInt64))
f.Add(int64(math.MinInt64))
f.Fuzz(func(t *testing.T, input int64) {
testCastIntFuzz[int64, int](t, input)
testCastIntFuzz[int64, int8](t, input)
testCastIntFuzz[int64, int16](t, input)
testCastIntFuzz[int64, int32](t, input)
testCastIntFuzz[int64, int64](t, input)
testCastUintFuzz[int64, uint](t, input)
testCastUintFuzz[int64, uint8](t, input)
testCastUintFuzz[int64, uint16](t, input)
testCastUintFuzz[int64, uint32](t, input)
testCastUintFuzz[int64, uint64](t, input)
})
}
func FuzzCastUint(f *testing.F) {
f.Add(uint(0))
f.Add(uint(1))
f.Add(uint(math.MaxUint64))
f.Fuzz(func(t *testing.T, input uint) {
testCastIntFuzz[uint, uint](t, input)
testCastIntFuzz[uint, uint8](t, input)
testCastIntFuzz[uint, uint16](t, input)
testCastIntFuzz[uint, uint32](t, input)
testCastIntFuzz[uint, uint64](t, input)
testCastIntFuzz[uint, int](t, input)
testCastIntFuzz[uint, int8](t, input)
testCastIntFuzz[uint, int16](t, input)
testCastIntFuzz[uint, int32](t, input)
testCastIntFuzz[uint, int64](t, input)
})
}
func FuzzCastUint8(f *testing.F) {
f.Add(uint8(0))
f.Add(uint8(1))
f.Add(uint8(math.MaxUint8))
f.Fuzz(func(t *testing.T, input uint8) {
testCastIntFuzz[uint8, uint](t, input)
testCastIntFuzz[uint8, uint8](t, input)
testCastIntFuzz[uint8, uint16](t, input)
testCastIntFuzz[uint8, uint32](t, input)
testCastIntFuzz[uint8, uint64](t, input)
testCastIntFuzz[uint8, int](t, input)
testCastIntFuzz[uint8, int8](t, input)
testCastIntFuzz[uint8, int16](t, input)
testCastIntFuzz[uint8, int32](t, input)
testCastIntFuzz[uint8, int64](t, input)
})
}
func FuzzCastUint16(f *testing.F) {
f.Add(uint16(0))
f.Add(uint16(1))
f.Add(uint16(math.MaxUint16))
f.Fuzz(func(t *testing.T, input uint16) {
testCastIntFuzz[uint16, uint](t, input)
testCastIntFuzz[uint16, uint8](t, input)
testCastIntFuzz[uint16, uint16](t, input)
testCastIntFuzz[uint16, uint32](t, input)
testCastIntFuzz[uint16, uint64](t, input)
testCastIntFuzz[uint16, int](t, input)
testCastIntFuzz[uint16, int8](t, input)
testCastIntFuzz[uint16, int16](t, input)
testCastIntFuzz[uint16, int32](t, input)
testCastIntFuzz[uint16, int64](t, input)
})
}
func FuzzCastUint32(f *testing.F) {
f.Add(uint32(0))
f.Add(uint32(1))
f.Add(uint32(math.MaxUint32))
f.Fuzz(func(t *testing.T, input uint32) {
testCastIntFuzz[uint32, uint](t, input)
testCastIntFuzz[uint32, uint8](t, input)
testCastIntFuzz[uint32, uint16](t, input)
testCastIntFuzz[uint32, uint32](t, input)
testCastIntFuzz[uint32, uint64](t, input)
testCastIntFuzz[uint32, int](t, input)
testCastIntFuzz[uint32, int8](t, input)
testCastIntFuzz[uint32, int16](t, input)
testCastIntFuzz[uint32, int32](t, input)
testCastIntFuzz[uint32, int64](t, input)
})
}
func FuzzCastUint64(f *testing.F) {
f.Add(uint64(0))
f.Add(uint64(1))
f.Add(uint64(math.MaxUint64))
f.Fuzz(func(t *testing.T, input uint64) {
testCastIntFuzz[uint64, uint](t, input)
testCastIntFuzz[uint64, uint8](t, input)
testCastIntFuzz[uint64, uint16](t, input)
testCastIntFuzz[uint64, uint32](t, input)
testCastIntFuzz[uint64, uint64](t, input)
testCastIntFuzz[uint64, int](t, input)
testCastIntFuzz[uint64, int8](t, input)
testCastIntFuzz[uint64, int16](t, input)
testCastIntFuzz[uint64, int32](t, input)
testCastIntFuzz[uint64, int64](t, input)
})
}
func testCastUintFuzz[From, To safeconversion.Integer](t *testing.T, input From) {
expectError := false
if input < 0 {
expectError = true
}
result, err := safeconversion.CastInt[From, To](input)
if expectError && err == nil {
t.Errorf("CastInt(%v) = %v, want error, got nil", input, result)
} else if err != nil {
if !errors.Is(err, safeconversion.ErrValueOutOfRange) {
t.Errorf("Unexpected error type: %v", err)
}
}
if err == nil && From(result) != input {
t.Errorf("CastInt(%v) = %v, want %v", input, result, input)
}
}
func testCastIntFuzz[From, To safeconversion.Integer](t *testing.T, input From) {
result, err := safeconversion.CastInt[From, To](input)
if err != nil {
// If there's an error, make sure it's one of the expected error types
if !errors.Is(err, safeconversion.ErrValueOutOfRange) {
t.Errorf("Unexpected error type: %v", err)
}
} else {
// If there's no error, verify that the result is within the valid range for the To type
if From(result) != input {
t.Errorf("Result %v does not match input %v", result, input)
}
}
}
func testCastInt[From, To safeconversion.Integer](input From, expected To, expectError bool, errorMsg error) func(*testing.T) {
return func(t *testing.T) {
result, err := safeconversion.CastInt[From, To](input)
if expectError && err == nil {
t.Errorf("CastInt(%v) = %v, want error, got nil", input, result)
} else if !expectError && err != nil {
t.Errorf("CastInt(%v) = error, want %v, got %v", input, errorMsg, err)
} else if result != expected {
t.Errorf("CastInt(%v) = %v, want %v", input, result, expected)
} else if expectError && err != nil && !errors.Is(err, errorMsg) {
t.Errorf("CastInt(%v) = error, want %v, got %v", input, errorMsg, err)
}
}
}