FloatOperationsTest.java

/*
 * ModeShape (http://www.modeshape.org)
 *
 * 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 org.modeshape.common.math;

import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class FloatOperationsTest {

    private FloatOperations ops = new FloatOperations();

    @Test
    public void shouldReturnProperExponenentInScientificNotation() {
        assertEquals(-3, ops.getExponentInScientificNotation(0.0010f));
        assertEquals(-3, ops.getExponentInScientificNotation(0.0020f));
        assertEquals(-3, ops.getExponentInScientificNotation(0.009999f));
        // assertEquals(-2, ops.getExponentInScientificNotation(0.010000000f) ); // precision is messing this up; actual is
        // 0.00999
        assertEquals(-2, ops.getExponentInScientificNotation(0.020000000f));
        assertEquals(-2, ops.getExponentInScientificNotation(0.09999f));
        assertEquals(-1, ops.getExponentInScientificNotation(0.10f));
        assertEquals(-1, ops.getExponentInScientificNotation(0.20f));
        assertEquals(-1, ops.getExponentInScientificNotation(0.9999f));
        assertEquals(0, ops.getExponentInScientificNotation(0.0f));
        assertEquals(0, ops.getExponentInScientificNotation(1.0f));
        assertEquals(0, ops.getExponentInScientificNotation(2.0f));
        assertEquals(0, ops.getExponentInScientificNotation(9.999f));
        assertEquals(1, ops.getExponentInScientificNotation(10.0f));
        assertEquals(1, ops.getExponentInScientificNotation(20.0f));
        assertEquals(1, ops.getExponentInScientificNotation(99.999f));
        assertEquals(2, ops.getExponentInScientificNotation(100.0f));
        assertEquals(2, ops.getExponentInScientificNotation(200.0f));
        assertEquals(2, ops.getExponentInScientificNotation(999.999f));
        assertEquals(3, ops.getExponentInScientificNotation(1000.0f));
        assertEquals(3, ops.getExponentInScientificNotation(2000.0f));
        assertEquals(3, ops.getExponentInScientificNotation(9999.999f));
    }

    @Test
    public void shouldRoundNumbersGreaterThan10() {
        assertEquals(101.0f, ops.roundUp(101.2523f, 0), 0.01f);
        assertEquals(101.0f, ops.roundUp(101.2323f, 0), 0.01f);
        assertEquals(101.3f, ops.roundUp(101.2523f, 1), 0.01f);
        assertEquals(101.2f, ops.roundUp(101.2323f, 1), 0.01f);
        assertEquals(110.0f, ops.roundUp(109.2323f, -1), 1f);
        assertEquals(100.0f, ops.roundUp(101.2323f, -1), 1f);
    }
}