/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.math;
import static com.google.common.collect.Iterables.get;
import static com.google.common.collect.Iterables.size;
import static com.google.common.math.MathTesting.ALL_DOUBLE_CANDIDATES;
import static com.google.common.math.MathTesting.ALL_ROUNDING_MODES;
import static com.google.common.math.MathTesting.ALL_SAFE_ROUNDING_MODES;
import static com.google.common.math.MathTesting.DOUBLE_CANDIDATES_EXCEPT_NAN;
import static com.google.common.math.MathTesting.FINITE_DOUBLE_CANDIDATES;
import static com.google.common.math.MathTesting.FRACTIONAL_DOUBLE_CANDIDATES;
import static com.google.common.math.MathTesting.INFINITIES;
import static com.google.common.math.MathTesting.INTEGRAL_DOUBLE_CANDIDATES;
import static com.google.common.math.MathTesting.NEGATIVE_INTEGER_CANDIDATES;
import static com.google.common.math.MathTesting.POSITIVE_FINITE_DOUBLE_CANDIDATES;
import static java.math.RoundingMode.CEILING;
import static java.math.RoundingMode.DOWN;
import static java.math.RoundingMode.FLOOR;
import static java.math.RoundingMode.HALF_DOWN;
import static java.math.RoundingMode.HALF_EVEN;
import static java.math.RoundingMode.HALF_UP;
import static java.math.RoundingMode.UNNECESSARY;
import static java.math.RoundingMode.UP;
import static java.util.Arrays.asList;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.primitives.Doubles;
import com.google.common.testing.NullPointerTester;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.util.Arrays;
import java.util.List;
import junit.framework.TestCase;
/**
* Tests for {@code DoubleMath}.
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
public class DoubleMathTest extends TestCase {
private static final BigDecimal MAX_INT_AS_BIG_DECIMAL = BigDecimal.valueOf(Integer.MAX_VALUE);
private static final BigDecimal MIN_INT_AS_BIG_DECIMAL = BigDecimal.valueOf(Integer.MIN_VALUE);
private static final BigDecimal MAX_LONG_AS_BIG_DECIMAL = BigDecimal.valueOf(Long.MAX_VALUE);
private static final BigDecimal MIN_LONG_AS_BIG_DECIMAL = BigDecimal.valueOf(Long.MIN_VALUE);
public void testConstantsMaxFactorial() {
BigInteger maxDoubleValue = BigDecimal.valueOf(Double.MAX_VALUE).toBigInteger();
assertTrue(BigIntegerMath.factorial(DoubleMath.MAX_FACTORIAL).compareTo(maxDoubleValue) <= 0);
assertTrue(
BigIntegerMath.factorial(DoubleMath.MAX_FACTORIAL + 1).compareTo(maxDoubleValue) > 0);
}
public void testConstantsEverySixteenthFactorial() {
for (int i = 0, n = 0; n <= DoubleMath.MAX_FACTORIAL; i++, n += 16) {
assertEquals(
BigIntegerMath.factorial(n).doubleValue(), DoubleMath.everySixteenthFactorial[i]);
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundIntegralDoubleToInt() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
boolean isInBounds = expected.compareTo(MAX_INT_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_INT_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.intValue(), DoubleMath.roundToInt(d, mode));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundFractionalDoubleToInt() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
boolean isInBounds = expected.compareTo(MAX_INT_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_INT_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(
"Rounding " + d + " with mode " + mode,
expected.intValue(),
DoubleMath.roundToInt(d, mode));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundExactIntegralDoubleToInt() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
BigDecimal expected = new BigDecimal(d).setScale(0, UNNECESSARY);
boolean isInBounds = expected.compareTo(MAX_INT_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_INT_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.intValue(), DoubleMath.roundToInt(d, UNNECESSARY));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundExactFractionalDoubleToIntFails() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
try {
DoubleMath.roundToInt(d, UNNECESSARY);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundNaNToIntAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToInt(Double.NaN, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
public void testRoundInfiniteToIntAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToInt(Double.POSITIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
try {
DoubleMath.roundToInt(Double.NEGATIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundIntegralDoubleToLong() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
boolean isInBounds = expected.compareTo(MAX_LONG_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_LONG_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.longValue(), DoubleMath.roundToLong(d, mode));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundFractionalDoubleToLong() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
boolean isInBounds = expected.compareTo(MAX_LONG_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_LONG_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.longValue(), DoubleMath.roundToLong(d, mode));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundExactIntegralDoubleToLong() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
// every mode except UNNECESSARY
BigDecimal expected = new BigDecimal(d).setScale(0, UNNECESSARY);
boolean isInBounds = expected.compareTo(MAX_LONG_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_LONG_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.longValue(), DoubleMath.roundToLong(d, UNNECESSARY));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundExactFractionalDoubleToLongFails() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
try {
DoubleMath.roundToLong(d, UNNECESSARY);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundNaNToLongAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToLong(Double.NaN, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToLong(double, RoundingMode)
public void testRoundInfiniteToLongAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToLong(Double.POSITIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
try {
DoubleMath.roundToLong(Double.NEGATIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundIntegralDoubleToBigInteger() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, mode));
}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundFractionalDoubleToBigInteger() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, mode));
}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundExactIntegralDoubleToBigInteger() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
BigDecimal expected = new BigDecimal(d).setScale(0, UNNECESSARY);
assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, UNNECESSARY));
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundExactFractionalDoubleToBigIntegerFails() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
try {
DoubleMath.roundToBigInteger(d, UNNECESSARY);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundNaNToBigIntegerAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToBigInteger(Double.NaN, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundInfiniteToBigIntegerAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToBigInteger(Double.POSITIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
try {
DoubleMath.roundToBigInteger(Double.NEGATIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {}
}
}
@GwtIncompatible // DoubleMath.roundToBigInteger(double, RoundingMode)
public void testRoundLog2Floor() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
int log2 = DoubleMath.log2(d, FLOOR);
assertTrue(StrictMath.pow(2.0, log2) <= d);
assertTrue(StrictMath.pow(2.0, log2 + 1) > d);
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode), StrictMath
public void testRoundLog2Ceiling() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
int log2 = DoubleMath.log2(d, CEILING);
assertTrue(StrictMath.pow(2.0, log2) >= d);
double z = StrictMath.pow(2.0, log2 - 1);
assertTrue(z < d);
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode), StrictMath
public void testRoundLog2Down() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
int log2 = DoubleMath.log2(d, DOWN);
if (d >= 1.0) {
assertTrue(log2 >= 0);
assertTrue(StrictMath.pow(2.0, log2) <= d);
assertTrue(StrictMath.pow(2.0, log2 + 1) > d);
} else {
assertTrue(log2 <= 0);
assertTrue(StrictMath.pow(2.0, log2) >= d);
assertTrue(StrictMath.pow(2.0, log2 - 1) < d);
}
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode), StrictMath
public void testRoundLog2Up() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
int log2 = DoubleMath.log2(d, UP);
if (d >= 1.0) {
assertTrue(log2 >= 0);
assertTrue(StrictMath.pow(2.0, log2) >= d);
assertTrue(StrictMath.pow(2.0, log2 - 1) < d);
} else {
assertTrue(log2 <= 0);
assertTrue(StrictMath.pow(2.0, log2) <= d);
assertTrue(StrictMath.pow(2.0, log2 + 1) > d);
}
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode)
public void testRoundLog2Half() {
// We don't expect perfect rounding accuracy.
for (int exp : asList(-1022, -50, -1, 0, 1, 2, 3, 4, 100, 1022, 1023)) {
for (RoundingMode mode : asList(HALF_EVEN, HALF_UP, HALF_DOWN)) {
double x = Math.scalb(Math.sqrt(2) + 0.001, exp);
double y = Math.scalb(Math.sqrt(2) - 0.001, exp);
if (exp < 0) {
assertEquals(exp + 1, DoubleMath.log2(x, mode));
assertEquals(exp, DoubleMath.log2(y, mode));
} else {
assertEquals(exp + 1, DoubleMath.log2(x, mode));
assertEquals(exp, DoubleMath.log2(y, mode));
}
}
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode)
public void testRoundLog2Exact() {
for (double x : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
boolean isPowerOfTwo = StrictMath.pow(2.0, DoubleMath.log2(x, FLOOR)) == x;
try {
int log2 = DoubleMath.log2(x, UNNECESSARY);
assertEquals(x, Math.scalb(1.0, log2));
assertTrue(isPowerOfTwo);
} catch (ArithmeticException e) {
assertFalse(isPowerOfTwo);
}
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode)
public void testRoundLog2ThrowsOnZerosInfinitiesAndNaN() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
for (double d :
asList(0.0, -0.0, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, Double.NaN)) {
try {
DoubleMath.log2(d, mode);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {}
}
}
}
@GwtIncompatible // DoubleMath.log2(double, RoundingMode)
public void testRoundLog2ThrowsOnNegative() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
try {
DoubleMath.log2(-d, mode);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {}
}
}
}
@GwtIncompatible // DoubleMath.isPowerOfTwo, DoubleMath.log2(double, RoundingMode), StrictMath
public void testIsPowerOfTwoYes() {
for (int i = -1074; i <= 1023; i++) {
assertTrue(DoubleMath.isPowerOfTwo(StrictMath.pow(2.0, i)));
}
}
@GwtIncompatible // DoubleMath.isPowerOfTwo, DoubleMath.log2(double, RoundingMode), StrictMath
public void testIsPowerOfTwo() {
for (double x : ALL_DOUBLE_CANDIDATES) {
boolean expected = x > 0 && !Double.isInfinite(x) && !Double.isNaN(x)
&& StrictMath.pow(2.0, DoubleMath.log2(x, FLOOR)) == x;
assertEquals(expected, DoubleMath.isPowerOfTwo(x));
}
}
@GwtIncompatible // #trueLog2, Math.ulp
public void testLog2Accuracy() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
double dmLog2 = DoubleMath.log2(d);
double trueLog2 = trueLog2(d);
assertTrue(Math.abs(dmLog2 - trueLog2) <= Math.ulp(trueLog2));
}
}
public void testLog2SemiMonotonic() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
assertTrue(DoubleMath.log2(d + 0.01) >= DoubleMath.log2(d));
}
}
public void testLog2Negative() {
for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
assertTrue(Double.isNaN(DoubleMath.log2(-d)));
}
}
public void testLog2Zero() {
assertEquals(Double.NEGATIVE_INFINITY, DoubleMath.log2(0.0));
assertEquals(Double.NEGATIVE_INFINITY, DoubleMath.log2(-0.0));
}
public void testLog2NaNInfinity() {
assertEquals(Double.POSITIVE_INFINITY, DoubleMath.log2(Double.POSITIVE_INFINITY));
assertTrue(Double.isNaN(DoubleMath.log2(Double.NEGATIVE_INFINITY)));
assertTrue(Double.isNaN(DoubleMath.log2(Double.NaN)));
}
@GwtIncompatible // StrictMath
private strictfp double trueLog2(double d) {
double trueLog2 = StrictMath.log(d) / StrictMath.log(2);
// increment until it's >= the true value
while (StrictMath.pow(2.0, trueLog2) < d) {
trueLog2 = StrictMath.nextUp(trueLog2);
}
// decrement until it's <= the true value
while (StrictMath.pow(2.0, trueLog2) > d) {
trueLog2 = StrictMath.nextAfter(trueLog2, Double.NEGATIVE_INFINITY);
}
if (StrictMath.abs(StrictMath.pow(2.0, trueLog2) - d)
> StrictMath.abs(StrictMath.pow(2.0, StrictMath.nextUp(trueLog2)) - d)) {
trueLog2 = StrictMath.nextUp(trueLog2);
}
return trueLog2;
}
@GwtIncompatible // DoubleMath.isMathematicalInteger
public void testIsMathematicalIntegerIntegral() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
assertTrue(DoubleMath.isMathematicalInteger(d));
}
}
@GwtIncompatible // DoubleMath.isMathematicalInteger
public void testIsMathematicalIntegerFractional() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
assertFalse(DoubleMath.isMathematicalInteger(d));
}
}
@GwtIncompatible // DoubleMath.isMathematicalInteger
public void testIsMathematicalIntegerNotFinite() {
for (double d :
Arrays.asList(Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, Double.NaN)) {
assertFalse(DoubleMath.isMathematicalInteger(d));
}
}
@GwtIncompatible // Math.ulp
public void testFactorial() {
for (int i = 0; i <= DoubleMath.MAX_FACTORIAL; i++) {
double actual = BigIntegerMath.factorial(i).doubleValue();
double result = DoubleMath.factorial(i);
assertEquals(actual, result, Math.ulp(actual));
}
}
public void testFactorialTooHigh() {
assertEquals(Double.POSITIVE_INFINITY, DoubleMath.factorial(DoubleMath.MAX_FACTORIAL + 1));
assertEquals(Double.POSITIVE_INFINITY, DoubleMath.factorial(DoubleMath.MAX_FACTORIAL + 20));
}
public void testFactorialNegative() {
for (int n : NEGATIVE_INTEGER_CANDIDATES) {
try {
DoubleMath.factorial(n);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {}
}
}
private static final ImmutableList<Double> FINITE_TOLERANCE_CANDIDATES =
ImmutableList.of(-0.0, 0.0, 1.0, 100.0, 10000.0, Double.MAX_VALUE);
private static final Iterable<Double> TOLERANCE_CANDIDATES =
Iterables.concat(FINITE_TOLERANCE_CANDIDATES, ImmutableList.of(Double.POSITIVE_INFINITY));
private static final List<Double> BAD_TOLERANCE_CANDIDATES =
Doubles.asList(-Double.MIN_VALUE, -Double.MIN_NORMAL, -1, -20, Double.NaN,
Double.NEGATIVE_INFINITY, -0.001);
public void testFuzzyEqualsFinite() {
for (double a : FINITE_DOUBLE_CANDIDATES) {
for (double b : FINITE_DOUBLE_CANDIDATES) {
for (double tolerance : FINITE_TOLERANCE_CANDIDATES) {
assertEquals(
Math.abs(a - b) <= tolerance,
DoubleMath.fuzzyEquals(a, b, tolerance));
}
}
}
}
public void testFuzzyInfiniteVersusFiniteWithFiniteTolerance() {
for (double inf : INFINITIES) {
for (double a : FINITE_DOUBLE_CANDIDATES) {
for (double tolerance : FINITE_TOLERANCE_CANDIDATES) {
assertFalse(DoubleMath.fuzzyEquals(a, inf, tolerance));
assertFalse(DoubleMath.fuzzyEquals(inf, a, tolerance));
}
}
}
}
public void testFuzzyInfiniteVersusInfiniteWithFiniteTolerance() {
for (double inf : INFINITIES) {
for (double tolerance : FINITE_TOLERANCE_CANDIDATES) {
assertTrue(DoubleMath.fuzzyEquals(inf, inf, tolerance));
assertFalse(DoubleMath.fuzzyEquals(inf, -inf, tolerance));
}
}
}
public void testFuzzyEqualsInfiniteTolerance() {
for (double a : DOUBLE_CANDIDATES_EXCEPT_NAN) {
for (double b : DOUBLE_CANDIDATES_EXCEPT_NAN) {
assertTrue(DoubleMath.fuzzyEquals(a, b, Double.POSITIVE_INFINITY));
}
}
}
public void testFuzzyEqualsOneNaN() {
for (double a : DOUBLE_CANDIDATES_EXCEPT_NAN) {
for (double tolerance : TOLERANCE_CANDIDATES) {
assertFalse(DoubleMath.fuzzyEquals(a, Double.NaN, tolerance));
assertFalse(DoubleMath.fuzzyEquals(Double.NaN, a, tolerance));
}
}
}
public void testFuzzyEqualsTwoNaNs() {
for (double tolerance : TOLERANCE_CANDIDATES) {
assertTrue(DoubleMath.fuzzyEquals(Double.NaN, Double.NaN, tolerance));
}
}
public void testFuzzyEqualsZeroTolerance() {
// make sure we test -0 tolerance
for (double zero : Doubles.asList(0.0, -0.0)) {
for (double a : ALL_DOUBLE_CANDIDATES) {
for (double b : ALL_DOUBLE_CANDIDATES) {
assertEquals(a == b || (Double.isNaN(a) && Double.isNaN(b)),
DoubleMath.fuzzyEquals(a, b, zero));
}
}
}
}
public void testFuzzyEqualsBadTolerance() {
for (double tolerance : BAD_TOLERANCE_CANDIDATES) {
try {
DoubleMath.fuzzyEquals(1, 2, tolerance);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
// success
}
}
}
/*
* We've split testFuzzyCompare() into multiple tests so that our internal Android test runner has
* a better chance of completing each within its per-test-method timeout.
*/
public void testFuzzyCompare0() {
runTestFuzzyCompare(0);
}
public void testFuzzyCompare1() {
runTestFuzzyCompare(1);
}
public void testFuzzyCompare2() {
runTestFuzzyCompare(2);
}
public void testFuzzyCompare3() {
runTestFuzzyCompare(3);
}
public void testFuzzyCompare4() {
runTestFuzzyCompare(4);
}
public void testFuzzyCompare5() {
runTestFuzzyCompare(5);
}
public void testFuzzyCompare6() {
runTestFuzzyCompare(6);
}
public void testFuzzyCompare7() {
assertEquals(7, size(TOLERANCE_CANDIDATES));
}
private static void runTestFuzzyCompare(int toleranceIndex) {
double tolerance = get(TOLERANCE_CANDIDATES, toleranceIndex);
for (double a : ALL_DOUBLE_CANDIDATES) {
for (double b : ALL_DOUBLE_CANDIDATES) {
int expected = DoubleMath.fuzzyEquals(a, b, tolerance) ? 0 : Double.compare(a, b);
int actual = DoubleMath.fuzzyCompare(a, b, tolerance);
assertEquals(Integer.signum(expected), Integer.signum(actual));
}
}
}
public void testFuzzyCompareBadTolerance() {
for (double tolerance : BAD_TOLERANCE_CANDIDATES) {
try {
DoubleMath.fuzzyCompare(1, 2, tolerance);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
// success
}
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_doubleVarargs() {
assertEquals(-1.375, DoubleMath.mean(1.1, -2.2, 4.4, -8.8), 1.0e-10);
assertEquals(1.1, DoubleMath.mean(1.1), 1.0e-10);
try {
DoubleMath.mean(Double.NaN);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
try {
DoubleMath.mean(Double.POSITIVE_INFINITY);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_intVarargs() {
assertEquals(-13.75, DoubleMath.mean(11, -22, 44, -88), 1.0e-10);
assertEquals(11.0, DoubleMath.mean(11), 1.0e-10);
}
@GwtIncompatible // DoubleMath.mean
public void testMean_longVarargs() {
assertEquals(-13.75, DoubleMath.mean(11L, -22L, 44L, -88L), 1.0e-10);
assertEquals(11.0, DoubleMath.mean(11L), 1.0e-10);
}
@GwtIncompatible // DoubleMath.mean
public void testMean_emptyVarargs() {
try {
DoubleMath.mean();
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_doubleIterable() {
assertEquals(-1.375, DoubleMath.mean(ImmutableList.of(1.1, -2.2, 4.4, -8.8)), 1.0e-10);
assertEquals(1.1, DoubleMath.mean(ImmutableList.of(1.1)), 1.0e-10);
try {
DoubleMath.mean(ImmutableList.<Double>of());
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
try {
DoubleMath.mean(ImmutableList.of(Double.NaN));
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
try {
DoubleMath.mean(ImmutableList.of(Double.POSITIVE_INFINITY));
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_intIterable() {
assertEquals(-13.75, DoubleMath.mean(ImmutableList.of(11, -22, 44, -88)), 1.0e-10);
assertEquals(11, DoubleMath.mean(ImmutableList.of(11)), 1.0e-10);
try {
DoubleMath.mean(ImmutableList.<Integer>of());
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_longIterable() {
assertEquals(-13.75, DoubleMath.mean(ImmutableList.of(11L, -22L, 44L, -88L)), 1.0e-10);
assertEquals(11, DoubleMath.mean(ImmutableList.of(11L)), 1.0e-10);
try {
DoubleMath.mean(ImmutableList.<Long>of());
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_intIterator() {
assertEquals(-13.75, DoubleMath.mean(ImmutableList.of(11, -22, 44, -88).iterator()), 1.0e-10);
assertEquals(11, DoubleMath.mean(ImmutableList.of(11).iterator()), 1.0e-10);
try {
DoubleMath.mean(ImmutableList.<Integer>of().iterator());
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // DoubleMath.mean
public void testMean_longIterator() {
assertEquals(-13.75, DoubleMath.mean(ImmutableList.of(11L, -22L, 44L, -88L).iterator()),
1.0e-10);
assertEquals(11, DoubleMath.mean(ImmutableList.of(11L).iterator()), 1.0e-10);
try {
DoubleMath.mean(ImmutableList.<Long>of().iterator());
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible // NullPointerTester
public void testNullPointers() {
NullPointerTester tester = new NullPointerTester();
tester.setDefault(double.class, 3.0);
tester.testAllPublicStaticMethods(DoubleMath.class);
}
}