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How to write JUnit test code in Java for the function finding Doublets who sum divisible by 9 from given array of Integers ?

—

by

anagendrakumar2020

in Java, JUnit5

This is the JUnit 5 solution to cover all kinds of inputs provided to find the Doublets whose sum divisible by 9 from an array of integers. This Unit test executes tests for the ‘ParseAnArrayInput’ function available in the class ‘DoubletsSumDivBy9J8’.

package pack1;

import java.util.Arrays;

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 JUnitTestDoubletsSumDivBy9J8 {
	
	DoubletsSumDivBy9_Using_Arrays DSDBUA;
	DoubletsSumDivBy9_Using_Predicates DSDBUP;
	DoubletsSumDivBy9_Using_Stream_and_Predicates DSDBUSP;
	
	@BeforeEach
	void setUp() throws Exception {
		DSDBUA = new DoubletsSumDivBy9_Using_Arrays();
		DSDBUP = new DoubletsSumDivBy9_Using_Predicates();
		DSDBUSP = new DoubletsSumDivBy9_Using_Stream_and_Predicates();
	}

	@Test
	@DisplayName("Positive inputs - Exp value and Actual matches")
	void test1() {
		Assertions.assertEquals("[[14, 58], [5, 58]]", DSDBUA.ParseAnArrayInput(new Integer[] { 14, 20, 11, 5, 29, 17, 58 }).toString());
		Assertions.assertEquals("[[90, 9], [90, 0], [90, 54], [9, 0], [9, 54], [0, 54]]", DSDBUP.ParseAnArrayInput(new Integer[] {  90, 9, 0, 54, 32, 51 }).toString());
		Assertions.assertEquals("[[4, 14], [4, 5]]", DSDBUSP.ParseAnArrayInput(new Integer[] { 4, 14, 10, 15, 2, 37, 5}).toString());
	}
	
	@Test
	@DisplayName("Negative inputs - Exp value and Actual does not matches")
	void test2() {
		Assertions.assertNotEquals("[[4, 8], [15, 8], [9, 23]]", DSDBUA.ParseAnArrayInput(new Integer[] { 14, 20, 11, 5, 29, 17, 58 }).toString());
		Assertions.assertNotEquals("[[19, 0], [9, 45], [10, 54]]", DSDBUP.ParseAnArrayInput(new Integer[] {  90, 9, 0, 54, 32, 51 }).toString());
		Assertions.assertNotEquals("[[24, 4], [45, 3]]", DSDBUSP.ParseAnArrayInput(new Integer[] { 4, 14, 10, 15, 2, 37, 5}).toString());
	}
	
	@Test
	@DisplayName("Null Array inputs")
	void test3() {
		Assertions.assertEquals(Arrays.asList(), DSDBUA.ParseAnArrayInput(null));
		Assertions.assertEquals(Arrays.asList(), DSDBUP.ParseAnArrayInput(null));
		Assertions.assertEquals(Arrays.asList(), DSDBUSP.ParseAnArrayInput(null));
	}

	@Test
	@DisplayName("Empty Array inputs")
	void test4() {
		Assertions.assertEquals(Arrays.asList(), DSDBUA.ParseAnArrayInput(new Integer[] {}));
		Assertions.assertEquals(Arrays.asList(), DSDBUP.ParseAnArrayInput(new Integer[] {}));
		Assertions.assertEquals(Arrays.asList(), DSDBUSP.ParseAnArrayInput(new Integer[] {}));
	}
}

Output:

Jun 14, 2023 7:45:26 PM pack1.DoubletsSumDivBy9_Using_Arrays ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Arrays'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ 14 20 11 5 29 17 58 ]
[[14, 58], [5, 58]]
Jun 14, 2023 7:45:26 PM pack1.DoubletsSumDivBy9_Using_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Predicates'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ 90 9 0 54 32 51 ]
[[90, 9], [90, 0], [90, 54], [9, 0], [9, 54], [0, 54]]
Jun 14, 2023 7:45:26 PM pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates'
Jun 14, 2023 7:45:26 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
4 14 10 15 2 37 5 
The triplets of numbers which are divisible by 9
[[4, 14], [4, 5]]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Arrays ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Arrays'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ 14 20 11 5 29 17 58 ]
[[14, 58], [5, 58]]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Predicates'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ 90 9 0 54 32 51 ]
[[90, 9], [90, 0], [90, 54], [9, 0], [9, 54], [0, 54]]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
4 14 10 15 2 37 5 
The triplets of numbers which are divisible by 9
[[4, 14], [4, 5]]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Arrays ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Arrays'
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Arrays ParseAnArrayInput
INFO: The given Input Array is null
[]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Predicates'
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Predicates ParseAnArrayInput
INFO: The given Input Array is null
[]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates'
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates ParseAnArrayInput
INFO: The given Input Array is null
[]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Arrays ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Arrays'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ ]
[]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Predicates'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are
[ ]
[]
Jun 14, 2023 7:45:27 PM pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates ParseAnArrayInput
INFO: This method 'ParseAnArrayInput' called from the Class 'pack1.JUnitTestDoubletsSumDivBy9J8'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.DoubletsSumDivBy9_Using_Stream_and_Predicates'
Jun 14, 2023 7:45:27 PM pack1.ArrayInputNum validateInputs
INFO: The provided Input validated Successfully
The given input Array values are

The triplets of numbers which are divisible by 9
[]

AfterEach Arrays.asList(Arrays.asList()) Assert Assert.assertArrayEquals Assert.assertEquals Assert.assertFalse Assert.assertThrows Assert.assertTrue assertEquals Assertions Assertions.assertEquals Assertions.assertNotEquals BeforeEach DisplayName exception exception.getMessage() IZ0-808 IZ0-809 IZ0-810 Java certification Junit JUnit5 Jupiter List<List<Integer>> new Integer[] { 14 new Integer[] {} 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() split Sun Certified Java Professional tearDown() test toString() Upgrade Java SE7 validations

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One response to “How to write JUnit test code in Java for the function finding Doublets who sum divisible by 9 from given array of Integers ?”

How to find Doublets whose sum is divisible by 9 from the given array of Integers ? – Java Ice Breakers

June 18, 2023

[…] The link to the JUnit5 test for this solution is here – https://javaicebreakers.com/2023/06/15/junit-test-doublets/ […]

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