From 184f80127c868d31883b968aecaa11746e1fc695 Mon Sep 17 00:00:00 2001
From: Michael Mkwelele <memkwelele@gmail.com>
Date: Tue, 12 Nov 2019 07:18:52 -0800
Subject: [PATCH] Add tests for factorial example. (#112)

---
 .../java/03_factorial/src/Factorial2.java     | 21 +++++++++++++++++++
 .../java/03_factorial/src/Factorial2Test.java | 20 ++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 03_recursion/java/03_factorial/src/Factorial2.java
 create mode 100644 03_recursion/java/03_factorial/src/Factorial2Test.java

diff --git a/03_recursion/java/03_factorial/src/Factorial2.java b/03_recursion/java/03_factorial/src/Factorial2.java
new file mode 100644
index 0000000..c9bafcb
--- /dev/null
+++ b/03_recursion/java/03_factorial/src/Factorial2.java
@@ -0,0 +1,21 @@
+public class Factorial2 {
+    public static void main(String[] args) {
+        Factorial2 factorial2 = new Factorial2();
+        System.out.println("The factorial of 5 is " + factorial2.getFactorial(5));
+    }
+
+    public int getFactorial(int number) {
+        if (isZeroOrOne(number)) {
+            return 1;
+        }
+
+        return number * getFactorial(number - 1);
+    }
+
+    public boolean isZeroOrOne(int number) {
+        if (number > 1) {
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/03_recursion/java/03_factorial/src/Factorial2Test.java b/03_recursion/java/03_factorial/src/Factorial2Test.java
new file mode 100644
index 0000000..a5fdd4e
--- /dev/null
+++ b/03_recursion/java/03_factorial/src/Factorial2Test.java
@@ -0,0 +1,20 @@
+import org.junit.Assert;
+import org.junit.Test;
+
+public class Factorial2Test {
+    @Test
+    public void testIsZeroOrOne() {
+        Factorial2 factorial2 = new Factorial2();
+
+        Assert.assertEquals(true, factorial2.isZeroOrOne(0));
+        Assert.assertEquals(true, factorial2.isZeroOrOne(1));
+        Assert.assertEquals(false, factorial2.isZeroOrOne(5));
+    }
+
+    @Test
+    public void testFactorial() {
+        Factorial2 factorial2 = new Factorial2();
+
+        Assert.assertEquals(120, factorial2.getFactorial(5));
+    }
+}