/*
* Copyright 2010 Google Inc.
*
* 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.gwt.emultest.java.lang;
import com.google.gwt.junit.client.GWTTestCase;
/**
* Tests for JRE emulation of java.lang.Math.
*
* TODO: more tests
*/
public class MathTest extends GWTTestCase {
private static native boolean isNegativeZero(double x) /*-{
var v = 1 / x;
return v == Number.NEGATIVE_INFINITY;
}-*/;
private static native double makeNegativeZero() /*-{
return 1 / Number.NEGATIVE_INFINITY;
}-*/;
@Override
public String getModuleName() {
return "com.google.gwt.emultest.EmulSuite";
}
public void testAbs() {
double v = Math.abs(-1.0);
double negativeZero = makeNegativeZero();
assertTrue(isNegativeZero(negativeZero));
assertEquals(1.0, v);
v = Math.abs(1.0);
assertEquals(1.0, v);
v = Math.abs(negativeZero);
assertEquals(0.0, v);
assertFalse(isNegativeZero(v));
v = Math.abs(0.0);
assertEquals(0.0, v);
v = Math.abs(Double.NEGATIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, v);
v = Math.abs(Double.POSITIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, v);
v = Math.abs(Double.NaN);
assertTrue(Double.isNaN(v));
}
public void testCbrt() {
double v = Math.cbrt(1000.0);
assertEquals(10.0, v, 1e-7);
}
public void testCos() {
double v = Math.cos(0.0);
assertEquals(1.0, v, 1e-7);
v = Math.cos(-0.0);
assertEquals(1.0, v, 1e-7);
v = Math.cos(Math.PI * .5);
assertEquals(0.0, v, 1e-7);
v = Math.cos(Math.PI);
assertEquals(-1.0, v, 1e-7);
v = Math.cos(Math.PI * 1.5);
assertEquals(0.0, v, 1e-7);
v = Math.cos(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.cos(Double.NEGATIVE_INFINITY);
assertTrue(Double.isNaN(v));
v = Math.cos(Double.POSITIVE_INFINITY);
assertTrue(Double.isNaN(v));
}
public void testCosh() {
double v = Math.cosh(0.0);
assertEquals(1.0, v, 1e-7);
v = Math.cosh(1.0);
assertEquals(1.5430806348, v, 1e-7);
v = Math.cosh(-1.0);
assertEquals(1.5430806348, v, 1e-7);
v = Math.cosh(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.cosh(Double.NEGATIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, v);
v = Math.cosh(Double.POSITIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, v);
}
public void testLog() {
double v = Math.log(Math.E);
assertEquals(1.0, v, 1e-15);
}
public void testLog10() {
double v = Math.log10(1000.0);
assertEquals(3.0, v, 1e-15);
}
public void testSin() {
double v = Math.sin(0.0);
assertEquals(0.0, v, 1e-7);
v = Math.sin(-0.0);
assertEquals(-0.0, v, 1e-7);
v = Math.sin(Math.PI * .5);
assertEquals(1.0, v, 1e-7);
v = Math.sin(Math.PI);
assertEquals(0.0, v, 1e-7);
v = Math.sin(Math.PI * 1.5);
assertEquals(-1.0, v, 1e-7);
v = Math.sin(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.sin(Double.NEGATIVE_INFINITY);
assertTrue(Double.isNaN(v));
v = Math.sin(Double.POSITIVE_INFINITY);
assertTrue(Double.isNaN(v));
}
public void testSinh() {
double v = Math.sinh(0.0);
assertEquals(0.0, v);
v = Math.sinh(1.0);
assertEquals(1.175201193, v, 1e-7);
v = Math.sinh(-1.0);
assertEquals(-1.175201193, v, 1e-7);
v = Math.sinh(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.sinh(Double.NEGATIVE_INFINITY);
assertEquals(Double.NEGATIVE_INFINITY, v);
v = Math.sinh(Double.POSITIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, v);
v = Math.sinh(-0.0);
assertEquals(-0.0, v);
}
public void testTan() {
double v = Math.tan(0.0);
assertEquals(0.0, v, 1e-7);
v = Math.tan(-0.0);
assertEquals(-0.0, v, 1e-7);
v = Math.tan(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.tan(Double.NEGATIVE_INFINITY);
assertTrue(Double.isNaN(v));
v = Math.tan(Double.POSITIVE_INFINITY);
assertTrue(Double.isNaN(v));
}
public void testTanh() {
double v = Math.tanh(0.0);
assertEquals(0.0, v);
v = Math.tanh(1.0);
assertEquals(0.761594155, v, 1e-7);
v = Math.tanh(-1.0);
assertEquals(-0.761594155, v, 1e-7);
v = Math.tanh(Double.NaN);
assertTrue(Double.isNaN(v));
v = Math.tanh(Double.NEGATIVE_INFINITY);
assertEquals(-1.0, v, 1e-7);
v = Math.tanh(Double.POSITIVE_INFINITY);
assertEquals(1.0, v, 1e-7);
v = Math.tanh(-0.0);
assertEquals(-0.0, v);
}
}