/*
* 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.Float.NaN;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Converter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
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 Floats}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(emulated = true)
@SuppressWarnings("cast") // redundant casts are intentional and harmless
public class FloatsTest extends TestCase {
private static final float[] EMPTY = {};
private static final float[] ARRAY1 = {(float) 1};
private static final float[] ARRAY234
= {(float) 2, (float) 3, (float) 4};
private static final float LEAST = Float.NEGATIVE_INFINITY;
private static final float GREATEST = Float.POSITIVE_INFINITY;
private static final float[] NUMBERS = new float[] {
LEAST, -Float.MAX_VALUE, -1f, -0f, 0f, 1f, Float.MAX_VALUE, GREATEST,
Float.MIN_NORMAL, -Float.MIN_NORMAL, Float.MIN_VALUE, -Float.MIN_VALUE,
Integer.MIN_VALUE, Integer.MAX_VALUE, Long.MIN_VALUE, Long.MAX_VALUE
};
private static final float[] VALUES
= Floats.concat(NUMBERS, new float[] {NaN});
public void testHashCode() {
for (float value : VALUES) {
assertEquals(((Float) value).hashCode(), Floats.hashCode(value));
}
}
public void testIsFinite() {
for (float value : NUMBERS) {
assertEquals(!(Float.isInfinite(value) || Float.isNaN(value)), Floats.isFinite(value));
}
}
public void testCompare() {
for (float x : VALUES) {
for (float y : VALUES) {
// note: spec requires only that the sign is the same
assertEquals(x + ", " + y,
Float.valueOf(x).compareTo(y),
Floats.compare(x, y));
}
}
}
public void testContains() {
assertFalse(Floats.contains(EMPTY, (float) 1));
assertFalse(Floats.contains(ARRAY1, (float) 2));
assertFalse(Floats.contains(ARRAY234, (float) 1));
assertTrue(Floats.contains(new float[] {(float) -1}, (float) -1));
assertTrue(Floats.contains(ARRAY234, (float) 2));
assertTrue(Floats.contains(ARRAY234, (float) 3));
assertTrue(Floats.contains(ARRAY234, (float) 4));
for (float value : NUMBERS) {
assertTrue("" + value, Floats.contains(new float[] {5f, value}, value));
}
assertFalse(Floats.contains(new float[] {5f, NaN}, NaN));
}
public void testIndexOf() {
assertEquals(-1, Floats.indexOf(EMPTY, (float) 1));
assertEquals(-1, Floats.indexOf(ARRAY1, (float) 2));
assertEquals(-1, Floats.indexOf(ARRAY234, (float) 1));
assertEquals(0, Floats.indexOf(
new float[] {(float) -1}, (float) -1));
assertEquals(0, Floats.indexOf(ARRAY234, (float) 2));
assertEquals(1, Floats.indexOf(ARRAY234, (float) 3));
assertEquals(2, Floats.indexOf(ARRAY234, (float) 4));
assertEquals(1, Floats.indexOf(
new float[] { (float) 2, (float) 3, (float) 2, (float) 3 },
(float) 3));
for (float value : NUMBERS) {
assertEquals("" + value, 1,
Floats.indexOf(new float[] {5f, value}, value));
}
assertEquals(-1, Floats.indexOf(new float[] {5f, NaN}, NaN));
}
public void testIndexOf_arrayTarget() {
assertEquals(0, Floats.indexOf(EMPTY, EMPTY));
assertEquals(0, Floats.indexOf(ARRAY234, EMPTY));
assertEquals(-1, Floats.indexOf(EMPTY, ARRAY234));
assertEquals(-1, Floats.indexOf(ARRAY234, ARRAY1));
assertEquals(-1, Floats.indexOf(ARRAY1, ARRAY234));
assertEquals(0, Floats.indexOf(ARRAY1, ARRAY1));
assertEquals(0, Floats.indexOf(ARRAY234, ARRAY234));
assertEquals(0, Floats.indexOf(
ARRAY234, new float[] { (float) 2, (float) 3 }));
assertEquals(1, Floats.indexOf(
ARRAY234, new float[] { (float) 3, (float) 4 }));
assertEquals(1, Floats.indexOf(ARRAY234, new float[] { (float) 3 }));
assertEquals(2, Floats.indexOf(ARRAY234, new float[] { (float) 4 }));
assertEquals(1, Floats.indexOf(new float[] { (float) 2, (float) 3,
(float) 3, (float) 3, (float) 3 },
new float[] { (float) 3 }
));
assertEquals(2, Floats.indexOf(
new float[] { (float) 2, (float) 3, (float) 2,
(float) 3, (float) 4, (float) 2, (float) 3},
new float[] { (float) 2, (float) 3, (float) 4}
));
assertEquals(1, Floats.indexOf(
new float[] { (float) 2, (float) 2, (float) 3,
(float) 4, (float) 2, (float) 3, (float) 4},
new float[] { (float) 2, (float) 3, (float) 4}
));
assertEquals(-1, Floats.indexOf(
new float[] { (float) 4, (float) 3, (float) 2},
new float[] { (float) 2, (float) 3, (float) 4}
));
for (float value : NUMBERS) {
assertEquals("" + value, 1, Floats.indexOf(
new float[] {5f, value, value, 5f}, new float[] {value, value}));
}
assertEquals(-1, Floats.indexOf(
new float[] {5f, NaN, NaN, 5f}, new float[] {NaN, NaN}));
}
public void testLastIndexOf() {
assertEquals(-1, Floats.lastIndexOf(EMPTY, (float) 1));
assertEquals(-1, Floats.lastIndexOf(ARRAY1, (float) 2));
assertEquals(-1, Floats.lastIndexOf(ARRAY234, (float) 1));
assertEquals(0, Floats.lastIndexOf(
new float[] {(float) -1}, (float) -1));
assertEquals(0, Floats.lastIndexOf(ARRAY234, (float) 2));
assertEquals(1, Floats.lastIndexOf(ARRAY234, (float) 3));
assertEquals(2, Floats.lastIndexOf(ARRAY234, (float) 4));
assertEquals(3, Floats.lastIndexOf(
new float[] { (float) 2, (float) 3, (float) 2, (float) 3 },
(float) 3));
for (float value : NUMBERS) {
assertEquals("" + value,
0, Floats.lastIndexOf(new float[] {value, 5f}, value));
}
assertEquals(-1, Floats.lastIndexOf(new float[] {NaN, 5f}, NaN));
}
public void testMax_noArgs() {
try {
Floats.max();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMax() {
assertEquals(GREATEST, Floats.max(GREATEST));
assertEquals(LEAST, Floats.max(LEAST));
assertEquals((float) 9, Floats.max(
(float) 8, (float) 6, (float) 7,
(float) 5, (float) 3, (float) 0, (float) 9));
assertEquals(0f, Floats.max(-0f, 0f));
assertEquals(0f, Floats.max(0f, -0f));
assertEquals(GREATEST, Floats.max(NUMBERS));
assertTrue(Float.isNaN(Floats.max(VALUES)));
}
public void testMin_noArgs() {
try {
Floats.min();
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testMin() {
assertEquals(LEAST, Floats.min(LEAST));
assertEquals(GREATEST, Floats.min(GREATEST));
assertEquals((float) 0, Floats.min(
(float) 8, (float) 6, (float) 7,
(float) 5, (float) 3, (float) 0, (float) 9));
assertEquals(-0f, Floats.min(-0f, 0f));
assertEquals(-0f, Floats.min(0f, -0f));
assertEquals(LEAST, Floats.min(NUMBERS));
assertTrue(Float.isNaN(Floats.min(VALUES)));
}
public void testConcat() {
assertTrue(Arrays.equals(EMPTY, Floats.concat()));
assertTrue(Arrays.equals(EMPTY, Floats.concat(EMPTY)));
assertTrue(Arrays.equals(EMPTY, Floats.concat(EMPTY, EMPTY, EMPTY)));
assertTrue(Arrays.equals(ARRAY1, Floats.concat(ARRAY1)));
assertNotSame(ARRAY1, Floats.concat(ARRAY1));
assertTrue(Arrays.equals(ARRAY1, Floats.concat(EMPTY, ARRAY1, EMPTY)));
assertTrue(Arrays.equals(
new float[] {(float) 1, (float) 1, (float) 1},
Floats.concat(ARRAY1, ARRAY1, ARRAY1)));
assertTrue(Arrays.equals(
new float[] {(float) 1, (float) 2, (float) 3, (float) 4},
Floats.concat(ARRAY1, ARRAY234)));
}
public void testEnsureCapacity() {
assertSame(EMPTY, Floats.ensureCapacity(EMPTY, 0, 1));
assertSame(ARRAY1, Floats.ensureCapacity(ARRAY1, 0, 1));
assertSame(ARRAY1, Floats.ensureCapacity(ARRAY1, 1, 1));
assertTrue(Arrays.equals(
new float[] {(float) 1, (float) 0, (float) 0},
Floats.ensureCapacity(ARRAY1, 2, 1)));
}
public void testEnsureCapacity_fail() {
try {
Floats.ensureCapacity(ARRAY1, -1, 1);
fail();
} catch (IllegalArgumentException expected) {
}
try {
// notice that this should even fail when no growth was needed
Floats.ensureCapacity(ARRAY1, 1, -1);
fail();
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible("Float.toString returns different value in GWT.")
public void testJoin() {
assertEquals("", Floats.join(",", EMPTY));
assertEquals("1.0", Floats.join(",", ARRAY1));
assertEquals("1.0,2.0", Floats.join(",", (float) 1, (float) 2));
assertEquals("1.02.03.0",
Floats.join("", (float) 1, (float) 2, (float) 3));
}
public void testLexicographicalComparator() {
List<float[]> ordered = Arrays.asList(
new float[] {},
new float[] {LEAST},
new float[] {LEAST, LEAST},
new float[] {LEAST, (float) 1},
new float[] {(float) 1},
new float[] {(float) 1, LEAST},
new float[] {GREATEST, Float.MAX_VALUE},
new float[] {GREATEST, GREATEST},
new float[] {GREATEST, GREATEST, GREATEST});
Comparator<float[]> comparator = Floats.lexicographicalComparator();
Helpers.testComparator(comparator, ordered);
}
@GwtIncompatible("SerializableTester")
public void testLexicographicalComparatorSerializable() {
Comparator<float[]> comparator = Floats.lexicographicalComparator();
assertSame(comparator, SerializableTester.reserialize(comparator));
}
@GwtIncompatible("SerializableTester")
public void testStringConverterSerialization() {
SerializableTester.reserializeAndAssert(Floats.stringConverter());
}
public void testToArray() {
// need explicit type parameter to avoid javac warning!?
List<Float> none = Arrays.<Float>asList();
assertTrue(Arrays.equals(EMPTY, Floats.toArray(none)));
List<Float> one = Arrays.asList((float) 1);
assertTrue(Arrays.equals(ARRAY1, Floats.toArray(one)));
float[] array = {(float) 0, (float) 1, (float) 3};
List<Float> three = Arrays.asList((float) 0, (float) 1, (float) 3);
assertTrue(Arrays.equals(array, Floats.toArray(three)));
assertTrue(Arrays.equals(array, Floats.toArray(Floats.asList(array))));
}
public void testToArray_threadSafe() {
for (int delta : new int[] { +1, 0, -1 }) {
for (int i = 0; i < VALUES.length; i++) {
List<Float> list = Floats.asList(VALUES).subList(0, i);
Collection<Float> misleadingSize =
Helpers.misleadingSizeCollection(delta);
misleadingSize.addAll(list);
float[] arr = Floats.toArray(misleadingSize);
assertEquals(i, arr.length);
for (int j = 0; j < i; j++) {
assertEquals(VALUES[j], arr[j]);
}
}
}
}
public void testToArray_withNull() {
List<Float> list = Arrays.asList((float) 0, (float) 1, null);
try {
Floats.toArray(list);
fail();
} catch (NullPointerException expected) {
}
}
public void testToArray_withConversion() {
float[] array = {(float) 0, (float) 1, (float) 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, Floats.toArray(bytes)));
assertTrue(Arrays.equals(array, Floats.toArray(shorts)));
assertTrue(Arrays.equals(array, Floats.toArray(ints)));
assertTrue(Arrays.equals(array, Floats.toArray(floats)));
assertTrue(Arrays.equals(array, Floats.toArray(longs)));
assertTrue(Arrays.equals(array, Floats.toArray(doubles)));
}
public void testAsList_isAView() {
float[] array = {(float) 0, (float) 1};
List<Float> list = Floats.asList(array);
list.set(0, (float) 2);
assertTrue(Arrays.equals(new float[] {(float) 2, (float) 1}, array));
array[1] = (float) 3;
assertThat(list).containsExactly((float) 2, (float) 3).inOrder();
}
public void testAsList_toArray_roundTrip() {
float[] array = { (float) 0, (float) 1, (float) 2 };
List<Float> list = Floats.asList(array);
float[] newArray = Floats.toArray(list);
// Make sure it returned a copy
list.set(0, (float) 4);
assertTrue(Arrays.equals(
new float[] { (float) 0, (float) 1, (float) 2 }, newArray));
newArray[1] = (float) 5;
assertEquals((float) 1, (float) list.get(1));
}
// This test stems from a real bug found by andrewk
public void testAsList_subList_toArray_roundTrip() {
float[] array = { (float) 0, (float) 1, (float) 2, (float) 3 };
List<Float> list = Floats.asList(array);
assertTrue(Arrays.equals(new float[] { (float) 1, (float) 2 },
Floats.toArray(list.subList(1, 3))));
assertTrue(Arrays.equals(new float[] {},
Floats.toArray(list.subList(2, 2))));
}
public void testAsListEmpty() {
assertSame(Collections.emptyList(), Floats.asList(EMPTY));
}
/**
* A reference implementation for {@code tryParse} that just catches the exception from
* {@link Float#valueOf}.
*/
private static Float referenceTryParse(String input) {
if (input.trim().length() < input.length()) {
return null;
}
try {
return Float.valueOf(input);
} catch (NumberFormatException e) {
return null;
}
}
@GwtIncompatible("Floats.tryParse")
private static void checkTryParse(String input) {
assertEquals(referenceTryParse(input), Floats.tryParse(input));
}
@GwtIncompatible("Floats.tryParse")
private static void checkTryParse(float expected, String input) {
assertEquals(Float.valueOf(expected), Floats.tryParse(input));
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseHex() {
for (String signChar : ImmutableList.of("", "+", "-")) {
for (String hexPrefix : ImmutableList.of("0x", "0X")) {
for (String iPart : ImmutableList.of("", "0", "1", "F", "f", "c4", "CE")) {
for (String fPart : ImmutableList.of("", ".", ".F", ".52", ".a")) {
for (String expMarker : ImmutableList.of("p", "P")) {
for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
checkTryParse(
signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
}
}
}
}
}
}
}
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseAllCodePoints() {
// Exercise non-ASCII digit test cases and the like.
char[] tmp = new char[2];
for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
Character.toChars(i, tmp, 0);
checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
}
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseOfToStringIsOriginal() {
for (float f : NUMBERS) {
checkTryParse(f, Float.toString(f));
}
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseOfToHexStringIsOriginal() {
for (float f : NUMBERS) {
checkTryParse(f, Float.toHexString(f));
}
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseNaN() {
checkTryParse("NaN");
checkTryParse("+NaN");
checkTryParse("-NaN");
}
@GwtIncompatible("Floats.tryParse")
public void testTryParseInfinity() {
checkTryParse(Float.POSITIVE_INFINITY, "Infinity");
checkTryParse(Float.POSITIVE_INFINITY, "+Infinity");
checkTryParse(Float.NEGATIVE_INFINITY, "-Infinity");
}
private static final String[] BAD_TRY_PARSE_INPUTS =
{ "", "+-", "+-0", " 5", "32 ", " 55 ", "infinity", "POSITIVE_INFINITY", "0x9A", "0x9A.bE-5",
".", ".e5", "NaNd", "InfinityF" };
@GwtIncompatible("Floats.tryParse")
public void testTryParseFailures() {
for (String badInput : BAD_TRY_PARSE_INPUTS) {
assertEquals(referenceTryParse(badInput), Floats.tryParse(badInput));
assertNull(Floats.tryParse(badInput));
}
}
@GwtIncompatible("NullPointerTester")
public void testNulls() {
new NullPointerTester().testAllPublicStaticMethods(Floats.class);
}
@GwtIncompatible("Float.toString returns different value in GWT.")
public void testStringConverter_convert() {
Converter<String, Float> converter = Floats.stringConverter();
assertEquals((Float) 1.0f, converter.convert("1.0"));
assertEquals((Float) 0.0f, converter.convert("0.0"));
assertEquals((Float) (-1.0f), converter.convert("-1.0"));
assertEquals((Float) 1.0f, converter.convert("1"));
assertEquals((Float) 0.0f, converter.convert("0"));
assertEquals((Float) (-1.0f), converter.convert("-1"));
assertEquals((Float) 1e6f, converter.convert("1e6"));
assertEquals((Float) 1e-6f, converter.convert("1e-6"));
}
public void testStringConverter_convertError() {
try {
Floats.stringConverter().convert("notanumber");
fail();
} catch (NumberFormatException expected) {
}
}
public void testStringConverter_nullConversions() {
assertNull(Floats.stringConverter().convert(null));
assertNull(Floats.stringConverter().reverse().convert(null));
}
@GwtIncompatible("Float.toString returns different value in GWT.")
public void testStringConverter_reverse() {
Converter<String, Float> converter = Floats.stringConverter();
assertEquals("1.0", converter.reverse().convert(1.0f));
assertEquals("0.0", converter.reverse().convert(0.0f));
assertEquals("-1.0", converter.reverse().convert(-1.0f));
assertEquals("1000000.0", converter.reverse().convert(1e6f));
assertEquals("1.0E-6", converter.reverse().convert(1e-6f));
}
@GwtIncompatible("NullPointerTester")
public void testStringConverter_nullPointerTester() throws Exception {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicInstanceMethods(Floats.stringConverter());
}
}