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/*
* Copyright (C) 2008 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 android.core;
import junit.framework.TestCase;
import android.test.suitebuilder.annotation.SmallTest;
/**
* Tests for basic functionality of floats and doubles.
*/
public class FloatDoubleTest extends TestCase {
@SmallTest
public void testFloatDouble() throws Exception {
Double d = Double.valueOf(1.0);
Float f = Float.valueOf(1.0f);
Object o = new Object();
assertFalse(f.equals(d));
assertFalse(d.equals(f));
assertFalse(f.equals(o));
assertFalse(d.equals(o));
assertFalse(f.equals(null));
assertFalse(d.equals(null));
}
@SmallTest
public void testFloat() throws Exception {
float pz = 0.0f;
float nz = -0.0f;
float pzero = 1.0f / Float.POSITIVE_INFINITY;
float nzero = 1.0f / Float.NEGATIVE_INFINITY;
// Everything compares as '=='
assertTrue(pz == pz);
assertTrue(pz == nz);
assertTrue(pz == pzero);
assertTrue(pz == nzero);
assertTrue(nz == pz);
assertTrue(nz == nz);
assertTrue(nz == pzero);
assertTrue(nz == nzero);
assertTrue(pzero == pz);
assertTrue(pzero == nz);
assertTrue(pzero == pzero);
assertTrue(pzero == nzero);
assertTrue(nzero == pz);
assertTrue(nzero == nz);
assertTrue(nzero == pzero);
assertTrue(nzero == nzero);
// +-0 are distinct as Floats
assertEquals(Float.valueOf(pz), Float.valueOf(pz));
assertTrue(!Float.valueOf(pz).equals(Float.valueOf(nz)));
assertEquals(Float.valueOf(pz), Float.valueOf(pzero));
assertTrue(!Float.valueOf(pz).equals(Float.valueOf(nzero)));
assertTrue(!Float.valueOf(nz).equals(Float.valueOf(pz)));
assertEquals(Float.valueOf(nz), Float.valueOf(nz));
assertTrue(!Float.valueOf(nz).equals(Float.valueOf(pzero)));
assertEquals(Float.valueOf(nz), Float.valueOf(nzero));
assertEquals(Float.valueOf(pzero), Float.valueOf(pz));
assertTrue(!Float.valueOf(pzero).equals(Float.valueOf(nz)));
assertEquals(Float.valueOf(pzero), Float.valueOf(pzero));
assertTrue(!Float.valueOf(pzero).equals(Float.valueOf(nzero)));
assertTrue(!Float.valueOf(nzero).equals(Float.valueOf(pz)));
assertEquals(Float.valueOf(nzero), Float.valueOf(nz));
assertTrue(!Float.valueOf(nzero).equals(Float.valueOf(pzero)));
assertEquals(Float.valueOf(nzero), Float.valueOf(nzero));
// Nan's compare as equal
Float sqrtm2 = Float.valueOf((float) Math.sqrt(-2.0f));
Float sqrtm3 = Float.valueOf((float) Math.sqrt(-3.0f));
assertEquals(sqrtm2, sqrtm3);
}
@SmallTest
public void testDouble() throws Exception {
double pz = 0.0;
double nz = -0.0;
double pzero = 1.0 / Double.POSITIVE_INFINITY;
double nzero = 1.0 / Double.NEGATIVE_INFINITY;
// Everything compares as '=='
assertTrue(pz == pz);
assertTrue(pz == nz);
assertTrue(pz == pzero);
assertTrue(pz == nzero);
assertTrue(nz == pz);
assertTrue(nz == nz);
assertTrue(nz == pzero);
assertTrue(nz == nzero);
assertTrue(pzero == pz);
assertTrue(pzero == nz);
assertTrue(pzero == pzero);
assertTrue(pzero == nzero);
assertTrue(nzero == pz);
assertTrue(nzero == nz);
assertTrue(nzero == pzero);
assertTrue(nzero == nzero);
// +-0 are distinct as Doubles
assertEquals(Double.valueOf(pz), Double.valueOf(pz));
assertTrue(!Double.valueOf(pz).equals(Double.valueOf(nz)));
assertEquals(Double.valueOf(pz), Double.valueOf(pzero));
assertTrue(!Double.valueOf(pz).equals(Double.valueOf(nzero)));
assertTrue(!Double.valueOf(nz).equals(Double.valueOf(pz)));
assertEquals(Double.valueOf(nz), Double.valueOf(nz));
assertTrue(!Double.valueOf(nz).equals(Double.valueOf(pzero)));
assertEquals(Double.valueOf(nz), Double.valueOf(nzero));
assertEquals(Double.valueOf(pzero), Double.valueOf(pz));
assertTrue(!Double.valueOf(pzero).equals(Double.valueOf(nz)));
assertEquals(Double.valueOf(pzero), Double.valueOf(pzero));
assertTrue(!Double.valueOf(pzero).equals(Double.valueOf(nzero)));
assertTrue(!Double.valueOf(nzero).equals(Double.valueOf(pz)));
assertEquals(Double.valueOf(nzero), Double.valueOf(nz));
assertTrue(!Double.valueOf(nzero).equals(Double.valueOf(pzero)));
assertEquals(Double.valueOf(nzero), Double.valueOf(nzero));
// Nan's compare as equal
Double sqrtm2 = Double.valueOf(Math.sqrt(-2.0));
Double sqrtm3 = Double.valueOf(Math.sqrt(-3.0));
assertEquals(sqrtm2, sqrtm3);
}
}
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