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How to write JUnit test code in Java for the function finding Leader numbers from given array of Integers ?

—

by

anagendrakumar2020

in Java, JUnit5

This is the JUnit 5 solution to cover all kinds of inputs and outputs to find the leader numbers from an array of integers. This Unit test executes tests for the ‘RdInputArray’ function available in the class ‘LeaderNumsJ8’.

package pack1;

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 JUnitTestLeaderNumsJ8 {

	LeaderNumbers_Using_Array_Backward LNUAB;
	LeaderNumbers_Using_Array_Forward LNUAF;
	LeaderNumbers_Using_Streams LNUS;

	@BeforeEach
	void setUp() throws Exception {

		LNUAB = new LeaderNumbers_Using_Array_Backward();
		LNUAF = new LeaderNumbers_Using_Array_Forward();
		LNUS = new LeaderNumbers_Using_Streams();
	}
	
	@Test
	@DisplayName("Positive inputs - Exp value and Actual matches")
	void test1() {
		Integer[] arrNums = { 10, 2, 41, 13, 8, 36, 7, 15, 21 };
		
		Assertions.assertEquals("[21, 36, 41]", LNUAB.RdInputArray(arrNums).toString());
		Assertions.assertEquals("[41, 36, 21]", LNUAF.RdInputArray(arrNums).toString());
		Assertions.assertEquals("[21, 36, 41]", LNUS.RdInputArray(arrNums).toString());
	}
	
	@Test
	@DisplayName("Negative inputs - Exp value and Actual matches")
	void test2() {
		Integer[] arrNums = { 51, 2, 41, 13, 8, 36, 7, 15, 21 };
		
		Assertions.assertNotEquals("[13, 36, 41]", LNUAB.RdInputArray(arrNums).toString());
		Assertions.assertNotEquals("[8, 21]", LNUAF.RdInputArray(arrNums).toString());
		Assertions.assertNotEquals("[41, 7, 10]", LNUS.RdInputArray(arrNums).toString());
	}
	
	@Test
	@DisplayName("Null inputs - Exp value and Actual matches")
	void test3() {
			
		Assertions.assertEquals("[]", LNUAB.RdInputArray(null).toString());
		Assertions.assertEquals("[]", LNUAF.RdInputArray(null).toString());
		Assertions.assertEquals("[]", LNUS.RdInputArray(null).toString());
	}
	@Test
	@DisplayName("Empty inputs - Exp value and Actual matches")
	void test4() {
		Integer[] arrNums = { };
		
		Assertions.assertEquals("[]", LNUAB.RdInputArray(arrNums).toString());
		Assertions.assertEquals("[]", LNUAF.RdInputArray(arrNums).toString());
		Assertions.assertEquals("[]", LNUS.RdInputArray(arrNums).toString());
	}
}

Output:
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Backward'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[21, 36, 41]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Forward'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[41, 36, 21]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Streams'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[21, 36, 41]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Backward'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[21, 36, 41, 51]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Forward'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[51, 41, 36, 21]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Streams'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: The provided Input validated Successfully
The leaders numbers from the given array
[21, 36, 41, 51]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Backward'
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: The given Input Array numbers are null
The leaders numbers from the given array
[]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Forward'
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: The given Input Array numbers are null
The leaders numbers from the given array
[]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Streams'
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: The given Input Array numbers are null
The leaders numbers from the given array
[]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Backward'
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Backward RdInputArray
INFO: The given Input Array numbers are null
The leaders numbers from the given array
[]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Array_Forward'
The leaders numbers from the given array
[]
The leaders numbers from the given array
[]
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Array_Forward RdInputArray
INFO: The given Input Array numbers are null
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: This method 'RdInputArray' called from the Class 'pack1.JUnitTestLeaderNumsJ8'
Jun 18, 2023 1:50:01 PM pack1.ReadInputArrayNums validateInputs
INFO: This method 'validateInputs()' called from the Class 'pack1.LeaderNumbers_Using_Streams'
Jun 18, 2023 1:50:01 PM pack1.LeaderNumbers_Using_Streams RdInputArray
INFO: The given Input Array numbers are null

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 Leader numbers from given array of Integers ?”

How to find Leader Numbers 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/2023/06/18/junittest-leadernums/ […]

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