/*
* Copyright (C) 2008 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.primitives;
import static com.google.common.truth.Truth.assertThat;
import static java.lang.Double.NaN;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Converter;
import com.google.common.collect.testing.Helpers;
import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* Unit test for {@link Doubles}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("cast") // redundant casts are intentional and harmless
public class DoublesTest extends TestCase {
private static final double[] EMPTY = {};
private static final double[] ARRAY1 = {(double) 1};
private static final double[] ARRAY234
= {(double) 2, (double) 3, (double) 4};
private static final double LEAST = Double.NEGATIVE_INFINITY;
private static final double GREATEST = Double.POSITIVE_INFINITY;
private static final double[] NUMBERS = new double[] {
LEAST, -Double.MAX_VALUE, -1.0, -0.5, -0.1, -0.0, 0.0, 0.1, 0.5, 1.0,
Double.MAX_VALUE, GREATEST, Double.MIN_NORMAL, -Double.MIN_NORMAL,
Double.MIN_VALUE, -Double.MIN_VALUE, Integer.MIN_VALUE,
Integer.MAX_VALUE, Long.MIN_VALUE, Long.MAX_VALUE
};
private static final double[] VALUES
= Doubles.concat(NUMBERS, new double[] {NaN});
public void testHashCode() {
for (double value : VALUES) {
assertEquals(((Double) value).hashCode(), Doubles.hashCode(value));
}
}
public void testIsFinite() {
for (double value : NUMBERS) {
assertEquals(!(Double.isNaN(value) || Double.isInfinite(value)), Doubles.isFinite(value));
}
}
public void testCompare() {
for (double x : VALUES) {
for (double y : VALUES) {
// note: spec requires only that the sign is the same
assertEquals(x + ", " + y,
Double.valueOf(x).compareTo(y),
Doubles.compare(x, y));
}
}
}
public void testContains() {
assertFalse(Doubles.contains(EMPTY, (double) 1));
assertFalse(Doubles.contains(ARRAY1, (double) 2));
assertFalse(Doubles.contains(ARRAY234, (double) 1));
assertTrue(Doubles.contains(new double[] {(double) -1}, (double) -1));
assertTrue(Doubles.contains(ARRAY234, (double) 2));
assertTrue(Doubles.contains(ARRAY234, (double) 3));
assertTrue(Doubles.contains(ARRAY234, (double) 4));
for (double value : NUMBERS) {
assertTrue("" + value,
Doubles.contains(new double[] {5.0, value}, value));
}
assertFalse(Doubles.contains(new double[] {5.0, NaN}, NaN));
}
public void testIndexOf() {
assertEquals(-1, Doubles.indexOf(EMPTY, (double) 1));
assertEquals(-1, Doubles.indexOf(ARRAY1, (double) 2));
assertEquals(-1, Doubles.indexOf(ARRAY234, (double) 1));
assertEquals(0, Doubles.indexOf(
new double[] {(double) -1}, (double) -1));
assertEquals(0, Doubles.indexOf(ARRAY234, (double) 2));
assertEquals(1, Doubles.indexOf(ARRAY234, (double) 3));
assertEquals(2, Doubles.indexOf(ARRAY234, (double) 4));
assertEquals(1, Doubles.indexOf(
new double[] { (double) 2, (double) 3, (double) 2, (double) 3 },
(double) 3));
for (double value : NUMBERS) {
assertEquals("" + value,
1, Doubles.indexOf(new double[] {5.0, value}, value));
}
assertEquals(-1, Doubles.indexOf(new double[] {5.0, NaN}, NaN));
}
public void testIndexOf_arrayTarget() {
assertEquals(0, Doubles.indexOf(EMPTY, EMPTY));
assertEquals(0, Doubles.indexOf(ARRAY234, EMPTY));
assertEquals(-1, Doubles.indexOf(EMPTY, ARRAY234));
assertEquals(-1, Doubles.indexOf(ARRAY234, ARRAY1));
assertEquals(-1, Doubles.indexOf(ARRAY1, ARRAY234));
assertEquals(0, Doubles.indexOf(ARRAY1, ARRAY1));
assertEquals(0, Doubles.indexOf(ARRAY234, ARRAY234));
assertEquals(0, Doubles.indexOf(
ARRAY234, new double[] { (double) 2, (double) 3 }));
assertEquals(1, Doubles.indexOf(
ARRAY234, new double[] { (double) 3, (double) 4 }));
assertEquals(1, Doubles.indexOf(ARRAY234, new double[] { (double) 3 }));
assertEquals(2, Doubles.indexOf(ARRAY234, new double[] { (double) 4 }));
assertEquals(1, Doubles.indexOf(new double[] { (double) 2, (double) 3,
(double) 3, (double) 3, (double) 3 },
new double[] { (double) 3 }
));
assertEquals(2, Doubles.indexOf(
new double[] { (double) 2, (double) 3, (double) 2,
(double) 3, (double) 4, (double) 2, (double) 3},
new double[] { (double) 2, (double) 3, (double) 4}
));
assertEquals(1, Doubles.indexOf(
new double[] { (double) 2, (double) 2, (double) 3,
(double) 4, (double) 2, (double) 3, (double) 4},
new double[] { (double) 2, (double) 3, (double) 4}
));
assertEquals(-1, Doubles.indexOf(
new double[] { (double) 4, (double) 3, (double) 2},
new double[] { (double) 2, (double) 3, (double) 4}
));
for (double value : NUMBERS) {
assertEquals("" + value, 1, Doubles.indexOf(
new double[] {5.0, value, value, 5.0}, new double[] {value, value}));
}
assertEquals(-1, Doubles.indexOf(
new double[] {5.0, NaN, NaN, 5.0}, new double[] {NaN, NaN}));
}
public void testLastIndexOf() {
assertEquals(-1, Doubles.lastIndexOf(EMPTY, (double) 1));
assertEquals(-1, Doubles.lastIndexOf(ARRAY1, (double) 2));
assertEquals(-1, Doubles.lastIndexOf(ARRAY234, (double) 1));
assertEquals(0, Doubles.lastIndexOf(
new double[] {(double) -1}, (double) -1));
assertEquals(0, Doubles.lastIndexOf(ARRAY234, (double) 2));
assertEquals(1, Doubles.lastIndexOf(ARRAY234, (double) 3));
assertEquals(2, Doubles.lastIndexOf(ARRAY234, (double) 4));
assertEquals(3, Doubles.lastIndexOf(
new double[] { (double) 2, (double) 3, (double) 2, (double) 3 },
(double) 3));
for (double value : NUMBERS) {
assertEquals("" + value,
0, Doubles.lastIndexOf(new double[] {value, 5.0}, value));
}
assertEquals(-1, Doubles.lastIndexOf(new double[] {NaN, 5.0}, NaN));
}
public void testMax_noArgs() {
try {
Doubles.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(LEAST, Doubles.max(LEAST));
assertEquals(GREATEST, Doubles.max(GREATEST));
assertEquals((double) 9, Doubles.max(
(double) 8, (double) 6, (double) 7,
(double) 5, (double) 3, (double) 0, (double) 9));
assertEquals(0.0, Doubles.max(-0.0, 0.0));
assertEquals(0.0, Doubles.max(0.0, -0.0));
assertEquals(GREATEST, Doubles.max(NUMBERS));
assertTrue(Double.isNaN(Doubles.max(VALUES)));
}
public void testMin_noArgs() {
try {
Doubles.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, Doubles.min(LEAST));
assertEquals(GREATEST, Doubles.min(GREATEST));
assertEquals((double) 0, Doubles.min(
(double) 8, (double) 6, (double) 7,
(double) 5, (double) 3, (double) 0, (double) 9));
assertEquals(-0.0, Doubles.min(-0.0, 0.0));
assertEquals(-0.0, Doubles.min(0.0, -0.0));
assertEquals(LEAST, Doubles.min(NUMBERS));
assertTrue(Double.isNaN(Doubles.min(VALUES)));
}
public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Doubles.concat()));
assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Doubles.concat(ARRAY1)));
assertNotSame(ARRAY1, Doubles.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Doubles.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(Arrays.equals(
new double[] {(double) 1, (double) 1, (double) 1},
Doubles.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(Arrays.equals(
new double[] {(double) 1, (double) 2, (double) 3, (double) 4},
Doubles.concat(ARRAY1, ARRAY234)));
}
public void testEnsureCapacity() {
assertSame(EMPTY, Doubles.ensureCapacity(EMPTY, 0, 1));
assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 0, 1));
assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 1, 1));
assertTrue(Arrays.equals(
new double[] {(double) 1, (double) 0, (double) 0},
Doubles.ensureCapacity(ARRAY1, 2, 1)));
}
public void testEnsureCapacity_fail() {
try {
Doubles.ensureCapacity(ARRAY1, -1, 1);
fail();
} catch (IllegalArgumentException expected) {
}
try {
// notice that this should even fail when no growth was needed
Doubles.ensureCapacity(ARRAY1, 1, -1);
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testJoinNonTrivialDoubles() {
assertEquals("", Doubles.join(",", EMPTY));
assertEquals("1.2", Doubles.join(",", 1.2));
assertEquals("1.3,2.4", Doubles.join(",", 1.3, 2.4));
assertEquals("1.42.53.6", Doubles.join("", 1.4, 2.5, 3.6));
}
public void testLexicographicalComparator() {
List<double[]> ordered = Arrays.asList(
new double[] {},
new double[] {LEAST},
new double[] {LEAST, LEAST},
new double[] {LEAST, (double) 1},
new double[] {(double) 1},
new double[] {(double) 1, LEAST},
new double[] {GREATEST, Double.MAX_VALUE},
new double[] {GREATEST, GREATEST},
new double[] {GREATEST, GREATEST, GREATEST});
Comparator<double[]> comparator = Doubles.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
public void testToArray() {
// need explicit type parameter to avoid javac warning!?
List<Double> none = Arrays.<Double>asList();
assertTrue(Arrays.equals(EMPTY, Doubles.toArray(none)));
List<Double> one = Arrays.asList((double) 1);
assertTrue(Arrays.equals(ARRAY1, Doubles.toArray(one)));
double[] array = {(double) 0, (double) 1, Math.PI};
List<Double> three = Arrays.asList((double) 0, (double) 1, Math.PI);
assertTrue(Arrays.equals(array, Doubles.toArray(three)));
assertTrue(Arrays.equals(array, Doubles.toArray(Doubles.asList(array))));
}
public void testToArray_threadSafe() {
for (int delta : new int[] { +1, 0, -1 }) {
for (int i = 0; i < VALUES.length; i++) {
List<Double> list = Doubles.asList(VALUES).subList(0, i);
Collection<Double> misleadingSize =
Helpers.misleadingSizeCollection(delta);
misleadingSize.addAll(list);
double[] arr = Doubles.toArray(misleadingSize);
assertEquals(i, arr.length);
for (int j = 0; j < i; j++) {
assertEquals(VALUES[j], arr[j]);
}
}
}
}
public void testToArray_withNull() {
List<Double> list = Arrays.asList((double) 0, (double) 1, null);
try {
Doubles.toArray(list);
fail();
} catch (NullPointerException expected) {
}
}
public void testToArray_withConversion() {
double[] array = {(double) 0, (double) 1, (double) 2};
List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2);
List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2);
List<Integer> ints = Arrays.asList(0, 1, 2);
List<Float> floats = Arrays.asList((float) 0, (float) 1, (float) 2);
List<Long> longs = Arrays.asList((long) 0, (long) 1, (long) 2);
List<Double> doubles = Arrays.asList((double) 0, (double) 1, (double) 2);
assertTrue(Arrays.equals(array, Doubles.toArray(bytes)));
assertTrue(Arrays.equals(array, Doubles.toArray(shorts)));
assertTrue(Arrays.equals(array, Doubles.toArray(ints)));
assertTrue(Arrays.equals(array, Doubles.toArray(floats)));
assertTrue(Arrays.equals(array, Doubles.toArray(longs)));
assertTrue(Arrays.equals(array, Doubles.toArray(doubles)));
}
public void testAsList_isAView() {
double[] array = {(double) 0, (double) 1};
List<Double> list = Doubles.asList(array);
list.set(0, (double) 2);
assertTrue(Arrays.equals(new double[] {(double) 2, (double) 1}, array));
array[1] = (double) 3;
assertThat(list).has().exactly((double) 2, (double) 3).inOrder();
}
public void testAsList_toArray_roundTrip() {
double[] array = { (double) 0, (double) 1, (double) 2 };
List<Double> list = Doubles.asList(array);
double[] newArray = Doubles.toArray(list);
// Make sure it returned a copy
list.set(0, (double) 4);
assertTrue(Arrays.equals(
new double[] { (double) 0, (double) 1, (double) 2 }, newArray));
newArray[1] = (double) 5;
assertEquals((double) 1, (double) list.get(1));
}
// This test stems from a real bug found by andrewk
public void testAsList_subList_toArray_roundTrip() {
double[] array = { (double) 0, (double) 1, (double) 2, (double) 3 };
List<Double> list = Doubles.asList(array);
assertTrue(Arrays.equals(new double[] { (double) 1, (double) 2 },
Doubles.toArray(list.subList(1, 3))));
assertTrue(Arrays.equals(new double[] {},
Doubles.toArray(list.subList(2, 2))));
}
public void testAsListEmpty() {
assertSame(Collections.emptyList(), Doubles.asList(EMPTY));
}
/**
* A reference implementation for {@code tryParse} that just catches the exception from
* {@link Double#valueOf}.
*/
private static Double referenceTryParse(String input) {
if (input.trim().length() < input.length()) {
return null;
}
try {
return Double.valueOf(input);
} catch (NumberFormatException e) {
return null;
}
}
private static final String[] BAD_TRY_PARSE_INPUTS =
{ "", "+-", "+-0", " 5", "32 ", " 55 ", "infinity", "POSITIVE_INFINITY", "0x9A", "0x9A.bE-5",
".", ".e5", "NaNd", "InfinityF" };
public void testStringConverter_convert() {
Converter<String, Double> converter = Doubles.stringConverter();
assertEquals((Double) 1.0, converter.convert("1.0"));
assertEquals((Double) 0.0, converter.convert("0.0"));
assertEquals((Double) (-1.0), converter.convert("-1.0"));
assertEquals((Double) 1.0, converter.convert("1"));
assertEquals((Double) 0.0, converter.convert("0"));
assertEquals((Double) (-1.0), converter.convert("-1"));
assertEquals((Double) 1e6, converter.convert("1e6"));
assertEquals((Double) 1e-6, converter.convert("1e-6"));
}
public void testStringConverter_convertError() {
try {
Doubles.stringConverter().convert("notanumber");
fail();
} catch (NumberFormatException expected) {
}
}
public void testStringConverter_nullConversions() {
assertNull(Doubles.stringConverter().convert(null));
assertNull(Doubles.stringConverter().reverse().convert(null));
}
}