Return Method Tests

Each example assumes the students file name is `Example#.java` replacing # with the actual example number. You can call the methods based on the student filename of your choice.

Students write an `int` method named `addFive(int number)` that takes an integer as a parameter and returns an `int` equal to 5 plus the parameter value.

import org.junit.Test;
import static org.junit.Assert.*;
public class CodingRoomsUnitTests {
@Test
public void testDefaultCase() {
// You may rename this method to better suit the purpose of your test case
// Your test case logic here
}
}

Sample Solution:

Example1.java
public class Example1
{
{
number += 5;
return number;
}
}

Example 2 - Average

Students write a method that takes 5 `int` values as parameters and returns the average value of the 5 ints as a `double`. The method must be named `average()` and it must have 5 `int` parameters. The method must return a `double`.
Example: Calling `average(1, 5, 7, 4, 10)` would return `5.4`.
Note: Assertions with doubles must have delta value (tolerance when comparing values).

import org.junit.Test;
import static org.junit.Assert.*;
public class CodingRoomsUnitTests {
@Test
public void testDefaultCase() {
// You may rename this method to better suit the purpose of your test case
// Your test case logic here
assertEquals(5.4, Example2.average(1, 5, 7, 4, 10), 0.001);
assertEquals(9.6, Example2.average(5, 9, 24, 6, 4), 0.001);
}
}

Sample Solution:

Example2.java
public class Example2
{
public static double average(int a, int b, int c, int d, int e)
{
//Calculate sum of 5 numbers
int s = a + b + c + d + e;
//cast s to double and divide by 5
return (double) s / 5;
}
}

Example 3 - Repeats

Students write a method that takes a String parameter. If the String has a double letter (i.e. contains the same letter twice in a row) then it should return true. Otherwise, it should return false.
This method must be named `hasRepeat(String str)` and have a `String` parameter. This method must return a `boolean`.

import org.junit.Test;
import static org.junit.Assert.*;
public class CodingRoomsUnitTests {
@Test
public void testDefaultCase() {
// You may rename this method to better suit the purpose of your test case
// Your test case logic here
assertTrue(Example3.hasRepeat("mississippi"));
assertFalse(Example3.hasRepeat("capsized"));
assertTrue(Example3.hasRepeat("mazzone"));
assertFalse(Example3.hasRepeat("this"));
}
}

Sample Solution:

Example3.java
public class Example3
{
public static boolean hasRepeat(String str)
{
for(int i = 0; i < str.length()-1; i++)
{
if(str.substring(i, i+1).equals(str.substring(i+1, i+2)))
{
return true;
}
}
return false;
}
}