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JUnit Coding Questions


  • Write a JUnit test case for a method that returns the sum of two numbers.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class CalculatorTest {

   @Test
   public void testAddition() {
      Calculator calculator = new Calculator();
      int result = calculator.add(3, 4);
      assertEquals(7, result);
   }
}
  • Write a JUnit test case for a method that returns the factorial of a number.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class CalculatorTest {

   @Test
   public void testFactorial() {
      Calculator calculator = new Calculator();
      int result = calculator.factorial(5);
      assertEquals(120, result);
   }
}
  • Write a JUnit test case for a method that checks whether a number is prime or not.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class PrimeTest {

   @Test
   public void testPrimeNumber() {
      Prime prime = new Prime();
      assertTrue(prime.isPrime(7));
   }

   @Test
   public void testNonPrimeNumber() {
      Prime prime = new Prime();
      assertFalse(prime.isPrime(4));
   }
}
  • Write a JUnit test case for a method that checks whether a string is a palindrome or not.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class PalindromeTest {

   @Test
   public void testPalindrome() {
      Palindrome palindrome = new Palindrome();
      assertTrue(palindrome.isPalindrome("racecar"));
   }

   @Test
   public void testNonPalindrome() {
      Palindrome palindrome = new Palindrome();
      assertFalse(palindrome.isPalindrome("hello"));
   }
}
  • Write a JUnit test case for a method that reverses a string.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class StringReverseTest {

   @Test
   public void testStringReverse() {
      StringReverse stringReverse = new StringReverse();
      String result = stringReverse.reverse("hello");
      assertEquals("olleh", result);
   }
}
  • Write a JUnit test case for a method that calculates the area of a rectangle.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class RectangleTest {

   @Test
   public void testArea() {
      Rectangle rectangle = new Rectangle(4, 5);
      double result = rectangle.area();
      assertEquals(20, result, 0);
   }
}
  • Write a JUnit test case for a method that calculates the circumference of a circle.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class CircleTest {

   @Test
   public void testCircumference() {
      Circle circle = new Circle(5);
      double result = circle.circumference();
      assertEquals(31.42, result, 0.01);
   }
}
  • Write a JUnit test case for a method that calculates the volume of a sphere.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class SphereTest {

   @Test
   public void testVolume() {
      Sphere sphere = new Sphere(5);
      double result = sphere.volume();
      assertEquals(523.6, result, 0.1);
   }
}
  • Write a JUnit test case for a method that sorts an array of integers.
java
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import org.junit.Test;
import static org.junit.Assert.assertArrayEquals;

public class SortTest {

   @Test
   public void testSort() {
      int[] array = {3, 2, 1, 4, 5};
      Sort sort = new Sort();
      int[] result = sort.sortArray(array);
      int[] expected = {1, 2, 3, 4, 5};
      assertArrayEquals(expected, result);
   }
}
  • Write a JUnit test case for a method that finds the maximum element in an array.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class MaxElementTest {

   @Test
   public void testMaxElement() {
      int[] array = {3, 2, 1, 4, 5};
      MaxElement maxElement = new MaxElement();
      int result = maxElement.findMax(array);
      assertEquals(5, result);
   }
}
  • Write a JUnit test case for a method that calculates the sum of a list of numbers.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ListSumTest {

   @Test
   public void testSum() {
      List<Integer> list = new ArrayList<>();
      list.add(3);
      list.add(4);
      list.add(5);
      ListSum listSum = new ListSum();
      int result = listSum.sum(list);
      assertEquals(12, result);
   }
}
  • Write a JUnit test case for a method that checks whether a list is sorted in ascending order.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class ListSortTest {

   @Test
   public void testSorted() {
      List<Integer> list = new ArrayList<>();
      list.add(1);
      list.add(2);
      list.add(3);
      ListSort listSort = new ListSort();
      assertTrue(listSort.isSorted(list));
   }

   @Test
   public void testUnsorted() {
      List<Integer> list = new ArrayList<>();
      list.add(3);
      list.add(2);
      list.add(1);
      ListSort listSort = new ListSort();
      assertFalse(listSort.isSorted(list));
   }
}
  • Write a JUnit test case for a method that reverses a list.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ListReverseTest {

   @Test
   public void testReverse() {
      List<Integer> list = new ArrayList<>();
      list.add(1);
      list.add(2);
      list.add(3);
      ListReverse listReverse = new ListReverse();
      List<Integer> result = listReverse.reverse(list);
      List<Integer> expected = new ArrayList<>();
      expected.add(3);
      expected.add(2);
      expected.add(1);
      assertEquals(expected, result);
   }
}
  • Write a JUnit test case for a method that returns the length of a string.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class StringLengthTest {

   @Test
   public void testLength() {
      StringLength stringLength = new StringLength();
      int result = stringLength.getLength("hello");
      assertEquals(5, result);
   }
}
  • Write a JUnit test case for a method that concatenates two strings.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class StringConcatTest {

   @Test
   public void testConcat() {
      StringConcat stringConcat = new StringConcat();
      String result = stringConcat.concatStrings("hello", "world");
      assertEquals("helloworld", result);
   }
}
  • Write a JUnit test case for a method that reverses a string.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class StringReverseTest {

   @Test
   public void testReverse() {
      StringReverse stringReverse = new StringReverse();
      String result = stringReverse.reverseString("hello");
      assertEquals("olleh", result);
   }
}
  • Write a JUnit test case for a method that checks whether a string is a palindrome.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class PalindromeTest {

   @Test
   public void testPalindrome() {
      Palindrome palindrome = new Palindrome();
      assertTrue(palindrome.isPalindrome("racecar"));
   }

   @Test
   public void testNotPalindrome() {
      Palindrome palindrome = new Palindrome();
      assertFalse(palindrome.isPalindrome("hello"));
   }
}
  • Write a JUnit test case for a method that checks whether a number is even.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class EvenNumberTest {

   @Test
   public void testEven() {
      EvenNumber evenNumber = new EvenNumber();
      assertTrue(evenNumber.isEven(2));
   }

   @Test
   public void testOdd() {
      EvenNumber evenNumber = new EvenNumber();
      assertFalse(evenNumber.isEven(3));
   }
}
  • Write a JUnit test case for a method that checks whether a number is prime.
java
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import org.junit.Test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;

public class PrimeNumberTest {

   @Test
   public void testPrime() {
      PrimeNumber primeNumber = new PrimeNumber();
      assertTrue(primeNumber.isPrime(7));
   }

   @Test
   public void testNotPrime() {
      PrimeNumber primeNumber = new PrimeNumber();
      assertFalse(primeNumber.isPrime(4));
   }
}
  • Write a JUnit test case for a method that calculates the factorial of a number.
java
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import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class FactorialTest {

   @Test
   public void testFactorial() {
      Factorial factorial = new Factorial();
      int result = factorial.calculateFactorial(5);
      assertEquals(120, result);
   }
}
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