/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 libcore.java.lang;
import junit.framework.TestCase;
public class DoubleTest extends TestCase {
public void testDoubleToStringUnsignedDivide() throws Exception {
// http://b/3238333
assertEquals("0.008", Double.toString(0.008));
assertEquals("0.008366", Double.toString(0.008366));
// http://code.google.com/p/android/issues/detail?id=14033
assertEquals("0.009", Double.toString(0.009));
// http://code.google.com/p/android/issues/detail?id=14302
assertEquals("0.008567856012638986", Double.toString(0.008567856012638986));
assertEquals("0.010206713752229896", Double.toString(0.010206713752229896));
}
public void testNamedDoubles() throws Exception {
assertEquals(Double.NaN, Double.parseDouble("NaN"));
assertEquals(Double.NaN, Double.parseDouble("-NaN"));
assertEquals(Double.NaN, Double.parseDouble("+NaN"));
try {
Double.parseDouble("NNaN");
fail();
} catch (NumberFormatException expected) {
}
try {
Double.parseDouble("NaNN");
fail();
} catch (NumberFormatException expected) {
}
assertEquals(Double.POSITIVE_INFINITY, Double.parseDouble("+Infinity"));
assertEquals(Double.POSITIVE_INFINITY, Double.parseDouble("Infinity"));
assertEquals(Double.NEGATIVE_INFINITY, Double.parseDouble("-Infinity"));
try {
Double.parseDouble("IInfinity");
fail();
} catch (NumberFormatException expected) {
}
try {
Double.parseDouble("Infinityy");
fail();
} catch (NumberFormatException expected) {
}
}
public void testSuffixParsing() throws Exception {
String[] badStrings = { "1ff", "1fd", "1df", "1dd" };
for (String string : badStrings) {
try {
Double.parseDouble(string);
fail(string);
} catch (NumberFormatException expected) {
}
}
assertEquals(1.0, Double.parseDouble("1f"));
assertEquals(1.0, Double.parseDouble("1d"));
assertEquals(1.0, Double.parseDouble("1F"));
assertEquals(1.0, Double.parseDouble("1D"));
assertEquals(1.0, Double.parseDouble("1.D"));
assertEquals(1.0, Double.parseDouble("1.E0D"));
assertEquals(1.0, Double.parseDouble(".1E1D"));
}
public void testExponentParsing() throws Exception {
String[] strings = {
// Exponents missing integer values.
"1.0e", "1.0e+", "1.0e-",
// Exponents with too many explicit signs.
"1.0e++1", "1.0e+-1", "1.0e-+1", "1.0e--1",
// http://code.google.com/p/android/issues/detail?id=20728
"save+", "save-",
};
for (String string : strings) {
try {
Double.parseDouble(string);
fail(string);
} catch (NumberFormatException expected) {
}
}
assertEquals(1.0e-323, Double.parseDouble("1.0e-323"));
assertEquals(0.0, Double.parseDouble("1.0e-324"));
assertEquals(-1.0e-323, Double.parseDouble("-1.0e-323"));
assertEquals(-0.0, Double.parseDouble("-1.0e-324"));
assertEquals(1.0e+308, Double.parseDouble("1.0e+308"));
assertEquals(Double.POSITIVE_INFINITY, Double.parseDouble("1.0e+309"));
assertEquals(-1.0e+308, Double.parseDouble("-1.0e+308"));
assertEquals(Double.NEGATIVE_INFINITY, Double.parseDouble("-1.0e+309"));
assertEquals(Double.POSITIVE_INFINITY, Double.parseDouble("1.0e+9999999999"));
assertEquals(Double.NEGATIVE_INFINITY, Double.parseDouble("-1.0e+9999999999"));
assertEquals(0.0, Double.parseDouble("1.0e-9999999999"));
assertEquals(-0.0, Double.parseDouble("-1.0e-9999999999"));
assertEquals(Double.POSITIVE_INFINITY, Double.parseDouble("320.0e+2147483647"));
assertEquals(-0.0, Double.parseDouble("-1.4e-2147483314"));
}
/**
* This value has been known to cause javac and java to infinite loop.
* http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
*/
public void testParseLargestSubnormalDoublePrecision() {
assertEquals(2.2250738585072014E-308, Double.parseDouble("2.2250738585072012e-308"));
assertEquals(2.2250738585072014E-308, Double.parseDouble("0.00022250738585072012e-304"));
assertEquals(2.2250738585072014E-308, Double.parseDouble("00000002.2250738585072012e-308"));
assertEquals(2.2250738585072014E-308, Double.parseDouble("2.225073858507201200000e-308"));
assertEquals(2.2250738585072014E-308, Double.parseDouble("2.2250738585072012e-00308"));
assertEquals(2.2250738585072014E-308, Double.parseDouble("2.22507385850720129978001e-308"));
assertEquals(-2.2250738585072014E-308, Double.parseDouble("-2.2250738585072012e-308"));
}
}