001/*
002 * ModeShape (http://www.modeshape.org)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.modeshape.common.math;
017
018import static org.hamcrest.core.Is.is;
019import static org.junit.Assert.assertEquals;
020import static org.junit.Assert.assertThat;
021import org.junit.Test;
022
023public class LongOperationsTest {
024
025    private LongOperations ops = new LongOperations();
026
027    @Test
028    public void shouldReturnProperExponenentInScientificNotation() {
029        assertEquals(0l, ops.getExponentInScientificNotation(0l));
030        assertEquals(0l, ops.getExponentInScientificNotation(1l));
031        assertEquals(0l, ops.getExponentInScientificNotation(2l));
032        assertEquals(0l, ops.getExponentInScientificNotation(9l));
033        assertEquals(1l, ops.getExponentInScientificNotation(10l));
034        assertEquals(1l, ops.getExponentInScientificNotation(20l));
035        assertEquals(1l, ops.getExponentInScientificNotation(99l));
036        assertEquals(2l, ops.getExponentInScientificNotation(100l));
037        assertEquals(2l, ops.getExponentInScientificNotation(200l));
038        assertEquals(2l, ops.getExponentInScientificNotation(999l));
039        assertEquals(3l, ops.getExponentInScientificNotation(1000l));
040        assertEquals(3l, ops.getExponentInScientificNotation(2000l));
041        assertEquals(3l, ops.getExponentInScientificNotation(9999l));
042    }
043
044    @Test
045    public void shouldRoundUpNumbersGreaterThan10() {
046        assertThat(ops.roundUp(-101l, 0), is(-101l));
047        assertThat(ops.roundUp(-101l, 1), is(-101l));
048        assertThat(ops.roundUp(-101l, 1), is(-101l));
049        assertThat(ops.roundUp(-101l, -1), is(-100l));
050        assertThat(ops.roundUp(-109l, -1), is(-110l));
051        assertThat(ops.roundUp(101l, 0), is(101l));
052        assertThat(ops.roundUp(101l, 0), is(101l));
053        assertThat(ops.roundUp(101l, 1), is(101l));
054        assertThat(ops.roundUp(101l, 1), is(101l));
055        assertThat(ops.roundUp(109l, -1), is(110l));
056        assertThat(ops.roundUp(101l, -1), is(100l));
057    }
058
059    @Test
060    public void shouldRoundDownNumbersGreaterThan10() {
061        assertThat(ops.roundDown(-101l, 0), is(-101l));
062        assertThat(ops.roundDown(-101l, 1), is(-101l));
063        assertThat(ops.roundDown(-101l, 1), is(-101l));
064        assertThat(ops.roundDown(-101l, -1), is(-100l));
065        assertThat(ops.roundDown(-109l, -1), is(-100l));
066        assertThat(ops.roundDown(101l, 0), is(101l));
067        assertThat(ops.roundDown(101l, 0), is(101l));
068        assertThat(ops.roundDown(101l, 1), is(101l));
069        assertThat(ops.roundDown(101l, 1), is(101l));
070        assertThat(ops.roundDown(109l, -1), is(100l));
071        assertThat(ops.roundDown(101l, -1), is(100l));
072    }
073
074    @Test
075    public void shouldKeepSignificantFigures() {
076        assertThat(ops.keepSignificantFigures(0l, 2), is(0l));
077        assertThat(ops.keepSignificantFigures(1201234l, 5), is(1201200l));
078        assertThat(ops.keepSignificantFigures(1201254l, 5), is(1201300l));
079        assertThat(ops.keepSignificantFigures(1201234l, 4), is(1201000l));
080        assertThat(ops.keepSignificantFigures(1201234l, 3), is(1200000l));
081        assertThat(ops.keepSignificantFigures(1201234l, 2), is(1200000l));
082        assertThat(ops.keepSignificantFigures(1201234l, 1), is(1000000l));
083        assertThat(ops.keepSignificantFigures(-1320l, 2), is(-1300l));
084    }
085}