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BAEL-2943

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This commit is contained in:
Rodrigo Graciano
2019-10-11 07:15:00 -04:00
parent 31b573dee0
commit 83e74e8deb
4 changed files with 20 additions and 47 deletions
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12
java-numbers/src/main/java/com/baeldung/nth/root/calculator/NthRootCalculator.java
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@@ -1,8 +1,12 @@
package com.baeldung.nth.root.calculator;
public class NthRootCalculator
{
public Double calculate(Double base, Double n) {
return Math.pow(Math.E, Math.log(base)/n);
public class NthRootCalculator {
public double calculateWithRound(double base, double n) {
return Math.round(calculate(base, n));
}
public double calculate(double base, double n) {
return Math.pow(base, 1.0 / n);
}
}

2
java-numbers/src/main/java/com/baeldung/nth/root/main/Main.java
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@@ -7,7 +7,7 @@ public class Main {
NthRootCalculator calculator = new NthRootCalculator();
Double base = Double.parseDouble(args[0]);
Double n = Double.parseDouble(args[1]);
Double result = calculator.calculate(base, n);
Double result = calculator.calculateWithRound(base, n);
System.out.println("The " + n + " root of " + base + " equals to " + result + ".");
}
}

19
java-numbers/src/test/java/com/baeldung/nth/root/calculator/NthRootCalculatorUnitTest.java
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@@ -1,19 +1,22 @@
package com.baeldung.nth.root.calculator;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.junit.MockitoJUnitRunner;
import static org.junit.Assert.assertEquals;
public class NthRootCalculatorUnitTest {
private NthRootCalculator nthRootCalculator = new NthRootCalculator();
@Test
public void whenBaseIs125AndNIs3_thenNthRootIs5() {
Double result = nthRootCalculator.calculate(125.0, 3.0);
assertEquals(result, (Double) 5.0d);
public void whenBaseIs125AndNIs3_thenNthIs5() {
double nth = nthRootCalculator.calculateWithRound(125,3);
assertEquals(5, nth, 0);
}
@Test
public void whenBaseIs625AndNIs4_thenNthIs5() {
double nth = nthRootCalculator.calculate(625,4);
assertEquals(5, nth, 0.00001);
}
}

34
java-numbers/src/test/java/com/baeldung/nth/root/main/MainUnitTest.java
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@@ -1,34 +0,0 @@
package com.baeldung.nth.root.main;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InjectMocks;
import static org.junit.Assert.assertEquals;
public class MainUnitTest {
@InjectMocks
private Main main;
private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
private final PrintStream originalOut = System.out;
@Before
public void setUpStreams() {
System.setOut(new PrintStream(outContent));
}
@After
public void restoreStreams() {
System.setOut(originalOut);
}
@Test
public void givenThatTheBaseIs125_andTheExpIs3_whenMainIsCalled_thenTheCorrectResultIsPrinted() {
main.main(new String[]{"125.0", "3.0"});
assertEquals("The 3.0 root of 125.0 equals to 5.0.\n", outContent.toString().replaceAll("\r", ""));
}
}