Add test for existing lint error

problem_statements/1a.md

@@ -0,0 +1,14 @@
+I'm running `existing_lint_error.py` as follows:
+
+```python
+./existing_lint_error.py
+```
+
+but I get the following error:
+
+```
+  File "/Users/fuchur/Documents/24/git_sync/swe-agent-test-repo/tests/./existing_lint_error.py", line 4
+    def division(a: float, b: float) -> float
+                                             ^
+SyntaxError: invalid syntax
+```

tests/existing_lint_error.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+"""This file is to test the behavior of the agent when there is an existing 
+lint error in the codebase.
+"""
+
+
+def f821():
+    notdefined
+
+
+def division(a: float, b: float) -> float
+    return a/b
+
+
+if __name__ == "__main__":
+    print(division(123, 15))
+