Added two JUnit sample apps

2 files changed, 48 insertions, 0 deletions

diff --git a/junit/02-maths/src/main/java/com/example/maths/Maths.java b/junit/02-maths/src/main/java/com/example/maths/Maths.java
new file mode 100644
index 0000000..aac3ac0
--- /dev/null
+++ b/junit/02-maths/src/main/java/com/example/maths/Maths.java
@@ -0,0 +1,16 @@
+package com.example.maths;
+
+public class Maths {
+
+    public int factorial(int number) {
+        if (number == 0) {
+            return 1;
+        }
+
+        return number * factorial(number - 1);
+    }
+
+    public int divide(int a, int b) {
+        return a / b;
+    }
+}
diff --git a/junit/02-maths/src/test/java/com/example/maths/MathsTest.java b/junit/02-maths/src/test/java/com/example/maths/MathsTest.java
new file mode 100644
index 0000000..4396901
--- /dev/null
+++ b/junit/02-maths/src/test/java/com/example/maths/MathsTest.java
@@ -0,0 +1,32 @@
+package com.example.maths;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class MathsTest {
+    private Maths maths;
+
+    @BeforeEach
+    void setUp() {
+        maths = new Maths();
+    }
+
+    @Test
+    void testFactorial() {
+        assertEquals(1, maths.factorial(0), "Factorial of 0");
+        assertEquals(1, maths.factorial(1), "Factorial of 1");
+        assertEquals(120, maths.factorial(5), "Factorial of 5");
+    }
+
+    @Test
+    void testDivideByZeroThrowsException() {     
+        ArithmeticException exception  = assertThrows(ArithmeticException.class, () -> {
+            maths.divide(10, 0);
+        });
+
+        assertEquals("/ by zero", exception.getMessage());
+    }
+}
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