diff --git a/main.py b/main.py
index aecd51e..1488c24 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,6 @@
+def divide_by_one(num): # Is whole number
+    return float(num).is_integer()
+
 def divide_by_two(num): # Take last digit, divide by two only on that
     return _get_last_digit(num) % 2 == 0
 
diff --git a/tests/one_test.py b/tests/one_test.py
new file mode 100644
index 0000000..35035ae
--- /dev/null
+++ b/tests/one_test.py
@@ -0,0 +1,12 @@
+from main import divide_by_one
+import unittest
+
+class TestDivideByOne(unittest.TestCase):
+    def test_by_1fractional(self):
+        self.assertFalse(divide_by_one(1.5))
+    def test_by_1(self):
+        self.assertTrue(divide_by_one(1))
+    def test_by_2(self):
+        self.assertTrue(divide_by_one(2))
+    def test_by_362880(self):
+        self.assertTrue(divide_by_one(362880))