Sweep: Add tests for context agent (#3646)

# Description
This pull request introduces a significant enhancement to the `sweepai`
project by adding unit tests for the context pruning functionality and
refactoring the `ripgrep` command execution into a separate function.
These changes aim to improve the maintainability and testability of the
codebase, ensuring that the context pruning logic works as expected and
can be easily extended in the future.

# Summary
- Refactored the execution of the `ripgrep` command into a new function
`run_ripgrep_command` in `sweepai/core/context_pruning.py` to streamline
the process of searching code entities within a repository.
- Added a comprehensive suite of unit tests in
`tests/test_context_pruning.py` covering key functionalities such as
building the full hierarchy of files, loading a graph from a file, and
retrieving relevant context based on a query. These tests ensure the
robustness and reliability of the context pruning feature.
- Enhanced code readability and maintainability by removing duplicated
`ripgrep` command execution logic and centralizing it into a single,
reusable function.
- The new tests contribute to a safer development environment, allowing
for future changes to be made with confidence that the core
functionality remains unaffected.

Fixes #3493.

---

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sweepai/core/context_pruning.py

@@ -172,6 +172,19 @@ def escape_ripgrep(text):
         text = text.replace(s, "\\" + s)
     return text
 
+def run_ripgrep_command(code_entity, repo_dir):
+    rg_command = [
+        "rg",
+        "-n",
+        "-i",
+        code_entity,
+        repo_dir,
+    ]
+    result = subprocess.run(
+        " ".join(rg_command), text=True, shell=True, capture_output=True
+    )
+    return result.stdout
+
 @staticmethod
 def can_add_snippet(snippet: Snippet, current_snippets: list[Snippet]):
     return (
@@ -752,18 +765,8 @@ def handle_function_call(
     if function_name == "code_search":
         code_entity = f'"{function_input["code_entity"]}"'  # handles cases with two words
         code_entity = escape_ripgrep(code_entity) # escape special characters
-        rg_command = [
-            "rg",
-            "-n",
-            "-i",
-            code_entity,
-            repo_context_manager.cloned_repo.repo_dir,
-        ]
         try:
-            result = subprocess.run(
-                " ".join(rg_command), text=True, shell=True, capture_output=True
-            )
-            rg_output = result.stdout
+            rg_output = run_ripgrep_command(code_entity, repo_context_manager.cloned_repo.repo_dir)
             if rg_output:
                 # post process rip grep output to be more condensed
                 rg_output_pretty, file_output_dict, file_to_num_occurrences = post_process_rg_output(

tests/test_context_pruning.py

@@ -0,0 +1,50 @@
+import unittest
+from sweepai.core.context_pruning import (
+    build_full_hierarchy,
+    load_graph_from_file,
+    RepoContextManager,
+    get_relevant_context,
+)
+import networkx as nx
+
+class TestContextPruning(unittest.TestCase):
+    def test_build_full_hierarchy(self):
+        G = nx.DiGraph()
+        G.add_edge("main.py", "database.py")
+        G.add_edge("database.py", "models.py")
+        G.add_edge("utils.py", "models.py")
+        hierarchy = build_full_hierarchy(G, "main.py", 2)
+        expected_hierarchy = """main.py
+├── database.py
+│   └── models.py
+└── utils.py
+    └── models.py
+"""
+        self.assertEqual(hierarchy, expected_hierarchy)
+
+    def test_load_graph_from_file(self):
+        graph = load_graph_from_file("tests/test_import_tree.txt")
+        self.assertIsInstance(graph, nx.DiGraph)
+        self.assertEqual(len(graph.nodes), 5)
+        self.assertEqual(len(graph.edges), 4)
+
+    def test_get_relevant_context(self):
+        cloned_repo = ClonedRepo("sweepai/sweep", "123", "main")
+        repo_context_manager = RepoContextManager(
+            dir_obj=None,
+            current_top_tree="",
+            snippets=[],
+            snippet_scores={},
+            cloned_repo=cloned_repo,
+        )
+        query = "allow 'sweep.yaml' to be read from the user/organization's .github repository. this is found in client.py and we need to change this to optionally read from .github/sweep.yaml if it exists there"
+        rcm = get_relevant_context(
+            query,
+            repo_context_manager,
+            seed=42,
+            ticket_progress=None,
+            chat_logger=None,
+        )
+        self.assertIsInstance(rcm, RepoContextManager)
+        self.assertTrue(len(rcm.current_top_snippets) > 0)
+        self.assertTrue(any("client.py" in snippet.file_path for snippet in rcm.current_top_snippets))