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How to write JUnit test code in Java for the function of finding the factorial of a given number?

—

by

anagendrakumar2020

in Java, JUnit5

This is the JUnit 5 solution to cover all kinds of inputs provided to find the factorial of a given number. This Unit test executes tests for the ‘RdInput’ function available in the class ‘FactorialOfNumJ8’.

package pack1;

import java.math.BigInteger;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

class JUnitTestFactorialOfNumJ8 {

	FactorialOfNum_Using_CoreLogic FNUCL;
	FactorialOfNum_Using_Recursion FNUR;
	FactorialOfNum_Using_Stream FNUS;

	@BeforeEach
	void setUp() throws Exception {

		FNUCL = new FactorialOfNum_Using_CoreLogic();
		FNUR = new FactorialOfNum_Using_Recursion();
		FNUS = new FactorialOfNum_Using_Stream();
	}

	@Test
	@DisplayName("Positive inputs - Exp value and Actual matches")
	void test1() {

		Assertions.assertEquals(new BigInteger("3628800"), FNUCL.RdInput(BigInteger.valueOf(10)));
		Assertions.assertEquals(new BigInteger("1307674368000"), FNUR.RdInput(BigInteger.valueOf(15)));
		Assertions.assertEquals(new BigInteger("121645100408832000"), FNUS.RdInput(BigInteger.valueOf(19)));
	}

	@Test
	@DisplayName("Positive inputs - Exp value and Actual matches")
	void test2() {

		Assertions.assertTrue(FNUCL.RdInput(BigInteger.valueOf(8)).compareTo(new BigInteger("40320")) == 0);
		Assertions.assertTrue(FNUR.RdInput(BigInteger.valueOf(13)).compareTo(new BigInteger("6227020800")) == 0);
		Assertions.assertTrue(FNUS.RdInput(BigInteger.valueOf(17)).compareTo(new BigInteger("355687428096000")) == 0);
	}

	@Test
	@DisplayName("Negative inputs - Exp value and Actual not matches")
	void test3() {

		Assertions.assertNotEquals(new BigInteger("548800"), FNUCL.RdInput(BigInteger.valueOf(10)));
		Assertions.assertNotEquals(new BigInteger("654674368000"), FNUR.RdInput(BigInteger.valueOf(15)));
		Assertions.assertNotEquals(new BigInteger("76545100408832000"), FNUS.RdInput(BigInteger.valueOf(19)));
	}

	@Test
	@DisplayName("Negative inputs - Exp value and Actual not matches")
	void test4() {

		Assertions.assertFalse(FNUCL.RdInput(BigInteger.valueOf(8)).compareTo(new BigInteger("54205")) == 0);
		Assertions.assertFalse(FNUR.RdInput(BigInteger.valueOf(13)).compareTo(new BigInteger("67020800")) == 0);
		Assertions.assertFalse(FNUS.RdInput(BigInteger.valueOf(17)).compareTo(new BigInteger("5653487428096000")) == 0);
	}

	@Test
	@DisplayName("Null inputs - Factorial of Null not exits")
	void test5() {

		Assertions.assertEquals(new BigInteger("-1"), FNUCL.RdInput(null));
		Assertions.assertEquals(new BigInteger("-1"), FNUR.RdInput(null));
		Assertions.assertEquals(new BigInteger("-1"), FNUS.RdInput(null));
	}
}

Output:
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_CoreLogic'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 10 is 3628800
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Recursion'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 15 is 1307674368000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Stream'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 19 is 121645100408832000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_CoreLogic'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 8 is 40320
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Recursion'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 13 is 6227020800
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Stream'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 17 is 355687428096000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_CoreLogic'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 10 is 3628800
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Recursion'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 15 is 1307674368000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Stream'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 19 is 121645100408832000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_CoreLogic'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 8 is 40320
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Recursion'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 13 is 6227020800
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Stream'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: The provided Input validated Successfully

Factorial of 17 is 355687428096000
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_CoreLogic'
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_CoreLogic RdInput
INFO: The given Input number is null
Factorial of Null not exits
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Recursion'
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Recursion RdInput
INFO: The given Input number is null
Factorial of Null not exits
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: This method 'RdInput' called from the Class 'pack1.JUnitTestFactorialOfNumJ8'
Mar 31, 2023 9:41:57 PM pack1.NumberInput validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.FactorialOfNum_Using_Stream'
Mar 31, 2023 9:41:57 PM pack1.FactorialOfNum_Using_Stream RdInput
INFO: The given Input number is null
Factorial of Null not exits

AfterEach Arrays.asList(Arrays.asList()) Assert Assert.assertArrayEquals Assert.assertEquals Assert.assertFalse Assert.assertThrows Assert.assertTrue assertEquals Assertion.assertFalse() Assertions Assertions.assertEquals Assertions.assertNotEquals Assertions.assertTrue() BeforeEach BigInteger BigInteger.valueOf() DisplayName exception exception.getMessage() IZ0-808 IZ0-809 IZ0-810 Java certification Junit JUnit5 Jupiter new BigInteger("") new Integer[] {} null array OCA Java Programmer 1 OCA Java Programmer 2 OCA Java SE8 OCP Java SE8 Oracle Certified Associate Java SE8 Oracle Certified Professional Java SE8 setUp() Sun Certified Java Professional tearDown() test Upgrade Java SE7 validations

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One response to “How to write JUnit test code in Java for the function of finding the factorial of a given number?”

How to find the factorial of a given number? – Java Ice Breakers

March 27, 2023

[…] The link to the JUnit5 test for this solution is here – https://javaicebreakers.com/2023/03/27/junit-test-code-factorial/ […]

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