use super::*;
async fn rejected_patch(content: &str, patch: &str) -> String {
let workspace = tempfile::tempdir().expect("workspace");
std::fs::write(workspace.path().join("note.txt"), content).expect("write fixture");
let context = ToolContext {
sandbox: Arc::new(Sandbox::new(
Arc::new(
crate::backend::sandbox::local::LocalSandbox::new(workspace.path())
.expect("local sandbox"),
),
crate::backend::sandbox::ApprovalPolicy::Ask,
)),
permissions: SandboxPermissions::restore(
"session",
crate::backend::sandbox::SandboxMode::WorkspaceWrite,
crate::backend::sandbox::NetworkAccess::Denied,
["patch".into()],
)
.for_call("patch"),
turn_id: "turn".into(),
};
ApplyPatch
.call(context, serde_json::json!({"patch": patch}))
.await
.expect_err("patch rejection")
.to_string()
}
#[test]
fn apply_patch_accepts_only_one_patch_document_argument() {
let parameters = ApplyPatch.definition().parameters;
assert_eq!(parameters["required"], serde_json::json!(["patch"]));
assert!(parameters["properties"].get("patch").is_some());
assert!(parameters["properties"].get("path").is_none());
assert!(
serde_json::from_value::<ApplyPatchArgs>(serde_json::json!({
"path": "note.txt",
"patch": "invalid"
}))
.is_err()
);
}
#[test]
fn apply_patch_preserves_crlf_line_endings() {
let patch = parse_patch_document(
"*** Begin Patch\n*** Update File: note.txt\n@@\n-old\n+new\n*** End Patch\n",
)
.expect("patch document");
assert_eq!(
apply_patch_document("first\r\nold\r\nlast\r\n", &patch).expect("applied patch"),
"first\r\nnew\r\nlast\r\n"
);
}
#[tokio::test]
async fn apply_patch_returns_a_unified_diff_after_writing() {
let workspace = tempfile::tempdir().expect("workspace");
let path = workspace.path().join("note.txt");
std::fs::write(&path, "first\nold\nlast\n").expect("write fixture");
let mut catalog = Catalog::default();
catalog
.register(Arc::new(ApplyPatch))
.expect("register patch tool");
let sandbox = Arc::new(Sandbox::new(
Arc::new(
crate::backend::sandbox::local::LocalSandbox::new(workspace.path())
.expect("local sandbox"),
),
crate::backend::sandbox::ApprovalPolicy::Ask,
));
let permissions = SandboxPermissions::restore(
"session",
crate::backend::sandbox::SandboxMode::WorkspaceWrite,
crate::backend::sandbox::NetworkAccess::Denied,
["call-1".into(), "call-2".into()],
);
let result = execute_batch(
&catalog,
&[ToolCall {
call_id: "call-1".into(),
name: "apply_patch".into(),
arguments: serde_json::json!({
"patch": "*** Begin Patch\n*** Update File: note.txt\n@@\n first\n-old\n+new\n last\n*** End Patch\n"
}),
}],
Arc::clone(&sandbox),
&permissions,
"turn",
)
.await
.pop()
.expect("tool result");
assert!(!result.is_error, "{}", result.output);
let patch = diffy::Patch::from_str(&result.output).expect("unified diff");
assert_eq!(
(patch.original(), patch.modified()),
(Some("note.txt"), Some("note.txt"))
);
assert!(result.output.contains("-old\n+new\n"));
assert_eq!(
diffy::apply("first\nold\nlast\n", &patch).expect("apply generated patch"),
"first\nnew\nlast\n"
);
assert_eq!(
std::fs::read_to_string(path).expect("read edited file"),
"first\nnew\nlast\n"
);
let no_op = execute_batch(
&catalog,
&[ToolCall {
call_id: "call-2".into(),
name: "apply_patch".into(),
arguments: serde_json::json!({
"patch": "*** Begin Patch\n*** Update File: note.txt\n@@\n first\n-new\n+new\n last\n*** End Patch\n"
}),
}],
sandbox,
&permissions,
"turn",
)
.await
.pop()
.expect("no-op result");
assert!(no_op.is_error);
assert_eq!(
no_op.output,
"tool error: Patch rejected: patch applies but makes no changes."
);
assert_eq!(
std::fs::read_to_string(workspace.path().join("note.txt")).expect("read unchanged file"),
"first\nnew\nlast\n"
);
}
#[tokio::test]
async fn apply_patch_reports_failed_context() {
let context = "Project Prometheus is a cloud-hosted modeling workspace.";
let content = format!("{}{context}\nactual next line\n", "padding\n".repeat(437));
let error = rejected_patch(
&content,
&format!(
"*** Begin Patch\n*** Update File: note.txt\n@@\n {context}\n-expected next line\n+replacement\n*** End Patch\n"
),
)
.await;
assert!(
error.contains("Patch rejected: no hunks matched the file"),
"{error}"
);
assert!(error.contains(context));
}
#[tokio::test]
async fn apply_patch_supports_context_headers_and_multiple_changes() {
let workspace = tempfile::tempdir().expect("workspace");
let path = workspace.path().join("runtime.rs");
let content = " fn first\ncomment\nold one\nmiddle\nsection\ncomment\nold two\nlast\n";
std::fs::write(&path, content).expect("write fixture");
let context = ToolContext {
sandbox: Arc::new(Sandbox::new(
Arc::new(
crate::backend::sandbox::local::LocalSandbox::new(workspace.path())
.expect("local sandbox"),
),
crate::backend::sandbox::ApprovalPolicy::Ask,
)),
permissions: SandboxPermissions::restore(
"session",
crate::backend::sandbox::SandboxMode::WorkspaceWrite,
crate::backend::sandbox::NetworkAccess::Denied,
["patch".into()],
)
.for_call("patch"),
turn_id: "turn".into(),
};
ApplyPatch
.call(
context,
serde_json::json!({
"patch": "*** Begin Patch\n*** Update File: runtime.rs\n@@ fn first\n-old one\n+new one\n@@ section\n-old two\n+new two\n last\n*** End of File\n*** End Patch\n"
}),
)
.await
.expect("applied patch");
assert_eq!(
std::fs::read_to_string(path).expect("read patched file"),
" fn first\ncomment\nnew one\nmiddle\nsection\ncomment\nnew two\nlast\n"
);
}
#[test]
fn apply_patch_keeps_changes_in_document_order() {
let patch = parse_patch_document(
"*** Begin Patch\n*** Update File: note.txt\n@@\n-A\n+a\n@@\n-B\n+b\n*** End Patch\n",
)
.expect("patch document");
assert_eq!(
apply_patch_document("B\nA\nB\n", &patch).expect("applied patch"),
"B\na\nb\n"
);
}
#[test]
fn apply_patch_context_only_changes_advance_document_order() {
let patch = parse_patch_document(
"*** Begin Patch\n*** Update File: note.txt\n@@\n A\n@@\n-B\n+b\n*** End Patch\n",
)
.expect("patch document");
assert_eq!(
apply_patch_document("B\nA\nB\n", &patch).expect("applied patch"),
"B\nA\nb\n"
);
}
#[test]
fn apply_patch_end_of_file_changes_the_final_duplicate() {
let patch = parse_patch_document(
"*** Begin Patch\n*** Update File: note.txt\n@@\n-old\n+new\n*** End of File\n\n*** End Patch\n",
)
.expect("patch document");
assert_eq!(
apply_patch_document("old\nmiddle\nold\n", &patch).expect("applied patch"),
"old\nmiddle\nnew\n"
);
}
#[test]
fn apply_patch_matches_the_whole_change_body() {
let patch = parse_patch_document(
"*** Begin Patch\n*** Update File: note.txt\n@@\n-old\n+new\n one\n two\n three\n four\n*** End Patch\n",
)
.expect("patch document");
assert_eq!(
apply_patch_document(
"old\none\ntwo\nthree\nwrong\nmiddle\nold\none\ntwo\nthree\nfour\n",
&patch,
)
.expect("applied patch"),
"old\none\ntwo\nthree\nwrong\nmiddle\nnew\none\ntwo\nthree\nfour\n"
);
}
#[tokio::test]
async fn apply_patch_rejects_unwrapped_and_multiple_file_documents() {
let unwrapped = rejected_patch("line\n", "@@ -1 +1 @@\n-old\n+new\n").await;
let multiple = rejected_patch(
"line\n",
"*** Begin Patch\n*** Update File: note.txt\n-line\n+new\n*** Update File: other.txt\n-old\n+new\n*** End Patch\n",
)
.await;
assert!(unwrapped.contains("missing `*** Begin Patch`"));
assert!(multiple.contains("only one existing-file `*** Update File` operation is supported"));
}
#[test]
fn apply_patch_rejects_pathological_fuzzy_matching() {
let content = "same\n".repeat(20_000);
let mut patch = String::from("--- ignored\n+++ ignored\n@@ -1,1000 +1,1000 @@\n");
patch.push_str(&" same\n".repeat(999));
patch.push_str("-same\n+changed\n");
let patch = Patch::from_str(&patch).expect("patch");
assert!(validate_patch_complexity(&content, &patch, &mut 0).is_err());
}
#[test]
fn apply_patch_bounds_matching_work_across_changes() {
let content = "same\n".repeat(2_000);
let patch =
Patch::from_str("--- ignored\n+++ ignored\n@@ -1 +1 @@\n-same\n+changed\n").expect("patch");
let mut work = 0;
assert!(validate_patch_complexity(&content, &patch, &mut work).is_ok());
assert!(
(0..MAX_PATCH_MATCH_WORK)
.any(|_| validate_patch_complexity(&content, &patch, &mut work).is_err())
);
}
#[tokio::test]
async fn apply_patch_cannot_make_a_file_unreadable() {
let workspace = tempfile::tempdir().expect("workspace");
let path = workspace.path().join("full.txt");
std::fs::write(&path, "x".repeat(crate::backend::sandbox::MAX_FILE_BYTES))
.expect("write fixture");
let sandbox = Arc::new(Sandbox::new(
Arc::new(
crate::backend::sandbox::local::LocalSandbox::new(workspace.path())
.expect("local sandbox"),
),
crate::backend::sandbox::ApprovalPolicy::Ask,
));
let context = ToolContext {
sandbox,
permissions: SandboxPermissions::restore(
"session",
crate::backend::sandbox::SandboxMode::WorkspaceWrite,
crate::backend::sandbox::NetworkAccess::Denied,
["patch".into()],
)
.for_call("patch"),
turn_id: "turn".into(),
};
let error = ApplyPatch
.call(
context,
serde_json::json!({
"patch": "*** Begin Patch\n*** Update File: full.txt\n@@\n+y\n*** End Patch\n"
}),
)
.await
.expect_err("oversized result");
assert!(error.to_string().contains("write limit"));
assert_eq!(
std::fs::metadata(path).expect("metadata").len(),
1024 * 1024
);
}