Add test file

tests/test_fibonacci.py

@@ -0,0 +1,17 @@
+from main.fibonacci import fibonacci
+
+
+def test_fibonacci():
+    assert fibonacci(9) == 34
+
+
+def test_fibonacci_1():
+    assert fibonacci(1) == 0
+
+
+def test_fibonacci_2():
+    assert fibonacci(5) == 5
+
+
+def test_fibonacci_3():
+    assert fibonacci(8) == 21