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/*
* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
* that can be found in the license/LICENSE.txt file.
*/
package test.numbers
import kotlin.test.*
object NumbersTestConstants {
public const val byteMinSucc: Byte = (Byte.MIN_VALUE + 1).toByte()
public const val byteMaxPred: Byte = (Byte.MAX_VALUE - 1).toByte()
public const val shortMinSucc: Short = (Short.MIN_VALUE + 1).toShort()
public const val shortMaxPred: Short = (Short.MAX_VALUE - 1).toShort()
public const val intMinSucc: Int = Int.MIN_VALUE + 1
public const val intMaxPred: Int = Int.MAX_VALUE - 1
public const val longMinSucc: Long = Long.MIN_VALUE + 1L
public const val longMaxPred: Long = Long.MAX_VALUE - 1L
}
class NumbersTest {
var one: Int = 1
var oneS: Short = 1
var oneB: Byte = 1
@Test fun intMinMaxValues() {
assertTrue(Int.MIN_VALUE < 0)
assertTrue(Int.MAX_VALUE > 0)
assertEquals(NumbersTestConstants.intMinSucc, Int.MIN_VALUE + one)
assertEquals(NumbersTestConstants.intMaxPred, Int.MAX_VALUE - one)
// overflow behavior
expect(Int.MIN_VALUE) { Int.MAX_VALUE + one }
expect(Int.MAX_VALUE) { Int.MIN_VALUE - one }
}
@Test fun longMinMaxValues() {
assertTrue(Long.MIN_VALUE < 0)
assertTrue(Long.MAX_VALUE > 0)
assertEquals(NumbersTestConstants.longMinSucc, Long.MIN_VALUE + one)
assertEquals(NumbersTestConstants.longMaxPred, Long.MAX_VALUE - one)
// overflow behavior
expect(Long.MIN_VALUE) { Long.MAX_VALUE + one }
expect(Long.MAX_VALUE) { Long.MIN_VALUE - one }
}
@Test fun shortMinMaxValues() {
assertTrue(Short.MIN_VALUE < 0)
assertTrue(Short.MAX_VALUE > 0)
assertEquals(NumbersTestConstants.shortMinSucc, Short.MIN_VALUE.inc())
assertEquals(NumbersTestConstants.shortMaxPred, Short.MAX_VALUE.dec())
// overflow behavior
expect(Short.MIN_VALUE) { (Short.MAX_VALUE + oneS).toShort() }
expect(Short.MAX_VALUE) { (Short.MIN_VALUE - oneS).toShort() }
}
@Test fun byteMinMaxValues() {
assertTrue(Byte.MIN_VALUE < 0)
assertTrue(Byte.MAX_VALUE > 0)
assertEquals(NumbersTestConstants.byteMinSucc, Byte.MIN_VALUE.inc())
assertEquals(NumbersTestConstants.byteMaxPred, Byte.MAX_VALUE.dec())
// overflow behavior
expect(Byte.MIN_VALUE) { (Byte.MAX_VALUE + oneB).toByte() }
expect(Byte.MAX_VALUE) { (Byte.MIN_VALUE - oneB).toByte() }
}
@Test fun doubleMinMaxValues() {
assertTrue(Double.MIN_VALUE > 0)
assertTrue(Double.MAX_VALUE > 0)
// overflow behavior
expect(Double.POSITIVE_INFINITY) { Double.MAX_VALUE * 2 }
expect(Double.NEGATIVE_INFINITY) {-Double.MAX_VALUE * 2 }
expect(0.0) { Double.MIN_VALUE / 2 }
}
@Test fun floatMinMaxValues() {
assertTrue(Float.MIN_VALUE > 0)
assertTrue(Float.MAX_VALUE > 0)
// overflow behavior
expect(Float.POSITIVE_INFINITY) { Float.MAX_VALUE * 2 }
expect(Float.NEGATIVE_INFINITY) { -Float.MAX_VALUE * 2 }
expect(0.0F) { Float.MIN_VALUE / 2.0F }
}
@Test fun charMinMaxValues() {
assertTrue(Char.MIN_VALUE.toInt() == 0)
assertTrue(Char.MAX_VALUE.toInt() > 0)
// overflow behavior
expect(Char.MIN_VALUE) { Char.MAX_VALUE + one }
expect(Char.MAX_VALUE) { Char.MIN_VALUE - one }
}
@Test fun doubleProperties() {
for (value in listOf(1.0, 0.0, Double.MIN_VALUE, Double.MAX_VALUE))
doTestNumber(value)
for (value in listOf(Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY))
doTestNumber(value, isInfinite = true)
doTestNumber(Double.NaN, isNaN = true)
}
@Test fun floatProperties() {
for (value in listOf(1.0F, 0.0F, Float.MAX_VALUE, Float.MIN_VALUE))
doTestNumber(value)
for (value in listOf(Float.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY))
doTestNumber(value, isInfinite = true)
doTestNumber(Float.NaN, isNaN = true)
}
private fun doTestNumber(value: Double, isNaN: Boolean = false, isInfinite: Boolean = false) {
assertEquals(isNaN, value.isNaN(), "Expected $value to have isNaN: $isNaN")
assertEquals(isInfinite, value.isInfinite(), "Expected $value to have isInfinite: $isInfinite")
assertEquals(!isNaN && !isInfinite, value.isFinite())
}
private fun doTestNumber(value: Float, isNaN: Boolean = false, isInfinite: Boolean = false) {
assertEquals(isNaN, value.isNaN(), "Expected $value to have isNaN: $isNaN")
assertEquals(isInfinite, value.isInfinite(), "Expected $value to have isInfinite: $isInfinite")
assertEquals(!isNaN && !isInfinite, value.isFinite())
}
@Test fun doubleToBits() {
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toBits())
assertEquals(0x400921fb54442d18L, kotlin.math.PI.toRawBits())
assertEquals(kotlin.math.PI, Double.fromBits(0x400921fb54442d18L))
for (value in listOf(Double.NEGATIVE_INFINITY, -Double.MAX_VALUE, -1.0, -Double.MIN_VALUE, -0.0, 0.0, Double.POSITIVE_INFINITY, Double.MAX_VALUE, 1.0, Double.MIN_VALUE)) {
assertEquals(value, Double.fromBits(value.toBits()))
assertEquals(value, Double.fromBits(value.toRawBits()))
}
assertTrue(Double.NaN.toBits().let(Double.Companion::fromBits).isNaN())
assertTrue(Double.NaN.toRawBits().let { Double.fromBits(it) }.isNaN())
assertEquals(0x7FF00000L shl 32, Double.POSITIVE_INFINITY.toBits())
assertEquals(0xFFF00000L shl 32, Double.NEGATIVE_INFINITY.toBits())
assertEquals(0x7FF80000_00000000L, Double.NaN.toBits())
assertEquals(0x7FF80000_00000000L, Double.NaN.toRawBits())
val bitsNaN = Double.NaN.toBits()
for (bitsDenormNaN in listOf(0xFFF80000L shl 32, bitsNaN or 1)) {
assertTrue(Double.fromBits(bitsDenormNaN).isNaN(), "expected $bitsDenormNaN represent NaN")
assertEquals(bitsNaN, Double.fromBits(bitsDenormNaN).toBits())
}
}
@Test fun floatToBits() {
val PI_F = kotlin.math.PI.toFloat()
assertEquals(0x40490fdb, PI_F.toBits())
assertAlmostEquals(PI_F, Float.fromBits(0x40490fdb)) // PI_F is actually Double in JS
// -Float.MAX_VALUE, Float.MAX_VALUE, -Float.MIN_VALUE, Float.MIN_VALUE: overflow or underflow
for (value in listOf(Float.NEGATIVE_INFINITY, -1.0F, -0.0F, 0.0F, Float.POSITIVE_INFINITY, 1.0F)) {
assertEquals(value, Float.fromBits(value.toBits()))
assertEquals(value, Float.fromBits(value.toRawBits()))
}
assertTrue(Float.NaN.toBits().let(Float.Companion::fromBits).isNaN())
assertTrue(Float.NaN.toRawBits().let { Float.fromBits(it) }.isNaN())
assertEquals(0xbf800000.toInt(), (-1.0F).toBits())
assertEquals(0x7fc00000, Float.NaN.toBits())
assertEquals(0x7fc00000, Float.NaN.toRawBits())
val bitsNaN = Float.NaN.toBits()
for (bitsDenormNaN in listOf(0xFFFC0000.toInt(), bitsNaN or 1)) {
assertTrue(Float.fromBits(bitsDenormNaN).isNaN(), "expected $bitsDenormNaN represent NaN")
assertEquals(bitsNaN, Float.fromBits(bitsDenormNaN).toBits())
}
}
@Test fun sizeInBitsAndBytes() {
fun testSizes(companion: Any, sizeBytes: Int, sizeBits: Int, expectedSizeBytes: Int) {
assertEquals(expectedSizeBytes, sizeBytes, companion.toString())
assertEquals(expectedSizeBytes * 8, sizeBits, companion.toString())
}
testSizes(Char, Char.SIZE_BYTES, Char.SIZE_BITS, 2)
testSizes(Byte, Byte.SIZE_BYTES, Byte.SIZE_BITS, 1)
testSizes(Short, Short.SIZE_BYTES, Short.SIZE_BITS, 2)
testSizes(Int, Int.SIZE_BYTES, Int.SIZE_BITS, 4)
testSizes(Long, Long.SIZE_BYTES, Long.SIZE_BITS, 8)
testSizes(UByte, UByte.SIZE_BYTES, UByte.SIZE_BITS, 1)
testSizes(UShort, UShort.SIZE_BYTES, UShort.SIZE_BITS, 2)
testSizes(UInt, UInt.SIZE_BYTES, UInt.SIZE_BITS, 4)
testSizes(ULong, ULong.SIZE_BYTES, ULong.SIZE_BITS, 8)
}
}
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