feat: code validation, endpoint and tests

tests/test_validate_code.py

@@ -0,0 +1,39 @@
+from langflow.utils.validate import validate_code
+
+
+def test_validate_code():
+    # Test case with a valid import and function
+    code1 = """
+import math
+
+def square(x):
+    return x ** 2
+"""
+    errors1 = validate_code(code1)
+    assert errors1 == {"imports": {"errors": []}, "function": {"errors": []}}
+
+    # Test case with an invalid import and valid function
+    code2 = """
+import non_existent_module
+
+def square(x):
+    return x ** 2
+"""
+    errors2 = validate_code(code2)
+    assert errors2 == {
+        "imports": {"errors": ["No module named 'non_existent_module'"]},
+        "function": {"errors": []},
+    }
+
+    # Test case with a valid import and invalid function syntax
+    code3 = """
+import math
+
+def square(x)
+    return x ** 2
+"""
+    errors3 = validate_code(code3)
+    assert errors3 == {
+        "imports": {"errors": []},
+        "function": {"errors": ["expected ':' (<unknown>, line 4)"]},
+    }