Write the test for round built-in function

Author: namannimmo10

integration_tests/test_builtin_round.py

@@ -0,0 +1,18 @@
+from ltypes import f64
+
+def test_round():
+    f: f64
+    f = 5.678
+    print(round(f))
+    assert round(f) == 6
+    f = -183745.23
+    print(round(f))
+    assert round(f) == -183745
+    f = 44.34
+    print(round(f))
+    assert round(f) == 44
+    assert round(13.001) == 13
+    assert round(-40.49999) == -40
+
+
+test_round()