Add test file for builtins

Author: namannimmo10

integration_tests/run_tests.py

@@ -13,6 +13,7 @@
     "modules_01.py",
     #"modules_02.py",
     "test_math.py",
+    "test_builtin.py",
 ]
 
 def main():

integration_tests/test_builtin.py

@@ -0,0 +1,22 @@
+from ltypes import i32
+from lpython_builtin import chr, ord
+
+
+def test_ord():
+    i: i32
+    s: str
+    s = "1"
+    i = ord(s)
+    print(i)
+
+
+def test_chr():
+    i: i32
+    i = 48
+    s: str
+    s = chr(i)
+    print(s)
+
+
+test_ord()
+test_chr()