507 lines
24 KiB
Rust
507 lines
24 KiB
Rust
//! MCP server properties (in-process, headless backend): tool schemas are valid, every tool
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//! survives junk arguments, JSON-RPC framing always answers correctly, and random editing through
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//! MCP keeps the document valid.
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// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md › Robustness).
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#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
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use proptest::prelude::*;
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use serde_json::{Value, json};
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use vectorcraft_doc::Document;
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use vectorcraft_mcp::{Headless, Server, tool_definitions};
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use vectorcraft_testkit::catch_quiet;
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use vectorcraft_testkit::invariants::{check_document, doc_json};
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use vectorcraft_testkit::strategies::{arb_ops, junk_values};
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fn server() -> Server {
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Server::new(Box::new(Headless::with_document()))
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}
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fn rpc(s: &mut Server, id: u64, method: &str, params: Value) -> Value {
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let line = json!({"jsonrpc": "2.0", "id": id, "method": method, "params": params}).to_string();
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let reply = s.handle_line(&line).expect("requests get a reply");
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let v: Value = serde_json::from_str(&reply).expect("reply is JSON");
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assert_eq!(v["jsonrpc"], "2.0");
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assert_eq!(v["id"], id);
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assert!(v.get("result").is_some() != v.get("error").is_some(), "exactly one of result/error: {v}");
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v
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}
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fn call(s: &mut Server, name: &str, args: Value) -> Value {
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rpc(s, 1, "tools/call", json!({"name": name, "arguments": args}))
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}
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fn document(s: &mut Server) -> Document {
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let v = rpc(s, 2, "resources/read", json!({"uri": "vectorcraft://document/json"}));
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let text = v["result"]["contents"][0]["text"].as_str().unwrap_or_else(|| panic!("{v}"));
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serde_json::from_str(text).expect("document JSON")
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}
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fn doc_uri_json(s: &mut Server) -> String {
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let list = rpc(s, 3, "resources/list", json!({}));
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list["result"]["resources"].as_array().unwrap().iter().find(|r| r["name"] == "document-json").unwrap()["uri"].as_str().unwrap().to_string()
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}
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/// Minimal JSON-schema sanity: an object schema with typed properties and consistent `required`.
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fn validate_schema(name: &str, schema: &Value) {
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assert_eq!(schema["type"], "object", "{name}: inputSchema.type");
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let props = schema.get("properties").and_then(Value::as_object).unwrap_or_else(|| panic!("{name}: properties must be an object"));
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for (k, p) in props {
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let p = p.as_object().unwrap_or_else(|| panic!("{name}.{k}: property schema must be an object"));
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assert!(
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p.contains_key("type") || p.contains_key("anyOf") || p.contains_key("oneOf") || p.contains_key("enum") || p.contains_key("$ref"),
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"{name}.{k}: property has no type"
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);
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if let Some(t) = p.get("type") {
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let ok = |t: &str| ["object", "array", "string", "number", "integer", "boolean", "null"].contains(&t);
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match t {
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Value::String(t) => assert!(ok(t), "{name}.{k}: bad type {t}"),
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Value::Array(ts) => assert!(ts.iter().all(|t| t.as_str().is_some_and(ok)), "{name}.{k}: bad types"),
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_ => panic!("{name}.{k}: type must be a string"),
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}
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if t == "array" {
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assert!(p.get("items").is_none_or(Value::is_object), "{name}.{k}: items must be a schema");
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}
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if t == "object" {
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assert!(p.get("properties").is_none_or(Value::is_object), "{name}.{k}: nested properties");
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}
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}
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if let Some(e) = p.get("enum") {
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assert!(e.as_array().is_some_and(|a| !a.is_empty()), "{name}.{k}: empty enum");
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}
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}
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if let Some(req) = schema.get("required") {
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for r in req.as_array().unwrap_or_else(|| panic!("{name}: required must be an array")) {
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let r = r.as_str().unwrap();
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assert!(props.contains_key(r), "{name}: required `{r}` is not a property");
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}
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}
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}
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#[test]
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fn tool_definitions_are_valid() {
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let tools = tool_definitions();
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assert!(tools.len() >= 15);
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let mut names = std::collections::HashSet::new();
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for t in &tools {
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let name = t["name"].as_str().expect("name");
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assert!(names.insert(name.to_string()), "duplicate tool {name}");
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assert!(name.chars().all(|c| c.is_ascii_lowercase() || c == '_'), "tool name {name}");
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assert!(t["description"].as_str().is_some_and(|d| d.len() >= 10), "{name}: description");
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assert!(t["annotations"]["readOnlyHint"].is_boolean(), "{name}: readOnlyHint");
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validate_schema(name, &t["inputSchema"]);
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}
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// tools/list over the protocol returns the same list.
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let mut s = server();
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let v = rpc(&mut s, 1, "tools/list", json!({}));
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assert_eq!(v["result"]["tools"].as_array().unwrap().len(), tools.len());
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}
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#[test]
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fn every_tool_survives_empty_and_junk_arguments() {
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let dir = vectorcraft_testkit::temp_dir("mcp-junk");
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let safe = dir.join("junk.vectorcraft").to_string_lossy().to_string();
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let mut failures = vec![];
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for t in tool_definitions() {
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let name = t["name"].as_str().unwrap().to_string();
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let props: Vec<String> = t["inputSchema"]["properties"].as_object().unwrap().keys().cloned().collect();
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let mut cases = vec![json!({}), Value::Null, json!([]), json!("x"), json!(3)];
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for k in &props {
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for v in junk_values() {
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// Never let fuzzed strings name files; keep renders small.
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let v = if k == "path" {
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json!(safe)
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} else if k == "scale" && v.as_f64().is_some_and(|x| x.abs() > 4.0) {
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json!(4)
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} else {
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v
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};
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cases.push(json!({ k.clone(): v }));
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}
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}
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for args in cases {
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let mut s = server();
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let r = catch_quiet(|| {
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let v = call(&mut s, &name, args.clone());
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if let Some(res) = v.get("result") {
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assert!(res["content"].is_array(), "{name}: result has no content array: {v}");
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}
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check_document(&document(&mut s))
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});
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match r {
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Err(p) => failures.push(format!("PANIC {name} {args}: {p}")),
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Ok(Err(e)) => failures.push(format!("{name} {args}: {e}")),
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Ok(Ok(())) => {}
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}
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}
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}
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assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
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}
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#[test]
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fn framing_never_panics_on_malformed_messages() {
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let mut s = server();
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for line in [
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"",
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"null",
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"[]",
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"[1,2,3]",
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"{}",
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"{\"jsonrpc\":\"2.0\",\"id\":{},\"method\":\"ping\"}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":5}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\"}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"nope\"}}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"run_command\",\"arguments\":[]}}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"resources/read\",\"params\":{\"uri\":\"nope://x\"}}",
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"{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"1900-01-01\"}}",
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"\u{0}\u{1}",
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"{\"jsonrpc\":\"2.0\",\"id\":1e400,\"method\":\"ping\"}",
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] {
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let r = catch_quiet(|| s.handle_line(line));
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assert!(r.is_ok(), "panic on {line:?}");
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if let Ok(Some(reply)) = r {
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let v: Value = serde_json::from_str(&reply).unwrap_or_else(|e| panic!("{line:?} → invalid JSON reply {reply}: {e}"));
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assert!(v.is_object() || v.is_array());
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}
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}
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// Still alive afterwards.
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rpc(&mut s, 7, "ping", json!({}));
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}
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#[test]
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fn resources_are_json() {
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let mut s = server();
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let uri = doc_uri_json(&mut s);
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let v = rpc(&mut s, 1, "resources/read", json!({"uri": uri}));
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let d: Document = serde_json::from_str(v["result"]["contents"][0]["text"].as_str().unwrap()).unwrap();
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check_document(&d).unwrap();
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let list = rpc(&mut s, 2, "resources/list", json!({}));
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for r in list["result"]["resources"].as_array().unwrap() {
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let v = rpc(&mut s, 3, "resources/read", json!({"uri": r["uri"]}));
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let text = v["result"]["contents"][0]["text"].as_str().unwrap();
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serde_json::from_str::<Value>(text).unwrap();
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}
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}
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// ---------- prompts, completions, templates, subscriptions ----------
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/// Every prompt is well formed and renders whatever it is handed.
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#[test]
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fn prompts_are_valid_and_render_with_junk_arguments() {
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let mut s = server();
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let listed = rpc(&mut s, 1, "prompts/list", json!({}));
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let prompts = listed["result"]["prompts"].as_array().unwrap();
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assert!(!prompts.is_empty());
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let mut failures = vec![];
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for p in prompts {
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let name = p["name"].as_str().unwrap();
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assert!(p["description"].as_str().unwrap().len() > 20, "{name}");
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let args: Vec<&str> = p["arguments"].as_array().map_or(&[][..], Vec::as_slice).iter().filter_map(|a| a["name"].as_str()).collect();
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// Missing, empty, junk and hostile arguments all either render or fail cleanly.
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let mut cases = vec![json!({}), Value::Null, json!([]), json!("x")];
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for a in &args {
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for v in junk_values() {
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cases.push(json!({ *a: v }));
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cases.push(json!({ *a: { "nested": v.clone() } }));
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cases.push(json!({ *a: [v.clone()] }));
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}
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}
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// Filled with every argument, the prompt must render.
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let full: Value = json!(args.iter().map(|a| (*a, "value")).collect::<std::collections::BTreeMap<_, _>>());
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cases.push(full);
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for arguments in cases {
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let r = catch_quiet(|| rpc(&mut s, 2, "prompts/get", json!({"name": name, "arguments": arguments.clone()})));
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match r {
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Err(p) => failures.push(format!("PANIC {name} {arguments}: {p}")),
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Ok(v) => {
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assert!(v["result"].is_object() || v["error"]["code"] == -32602, "{name} {arguments}: {v}");
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// Whatever it returned is valid JSON text in a message.
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if let Some(messages) = v["result"]["messages"].as_array() {
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for m in messages {
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assert!(["user", "assistant"].contains(&m["role"].as_str().unwrap()), "{m}");
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assert!(m["content"]["text"].is_string(), "{m}");
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}
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}
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}
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}
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}
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}
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assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
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}
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/// `completion/complete` answers for every prompt argument and never panics on junk.
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#[test]
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fn completions_are_well_formed_and_survive_junk() {
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let mut s = server();
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let listed = rpc(&mut s, 1, "prompts/list", json!({}));
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let mut cases = vec![];
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for p in listed["result"]["prompts"].as_array().unwrap() {
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let name = p["name"].as_str().unwrap();
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for a in p["arguments"].as_array().map_or(&[][..], Vec::as_slice) {
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let arg = a["name"].as_str().unwrap();
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for value in ["", "a", "svg", "%20", "..", &"x".repeat(300)] {
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cases.push(json!({"ref": {"type": "ref/prompt", "name": name}, "argument": {"name": arg, "value": value}}));
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}
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}
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// An argument the prompt does not have, and a prompt that does not exist.
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cases.push(json!({"ref": {"type": "ref/prompt", "name": name}, "argument": {"name": "nope", "value": ""}}));
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cases.push(json!({"ref": {"type": "ref/prompt", "name": "nope"}, "argument": {"name": "x", "value": ""}}));
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}
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for t in templates(&mut s) {
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for v in ["", "1", "%", "vectorcraft://x"] {
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cases.push(json!({"ref": {"type": "ref/resource", "uri": t["uriTemplate"]}, "argument": {"name": "id", "value": v}}));
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}
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}
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// And malformed references of every shape.
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for junk in [json!({}), json!(null), json!([]), json!("x")] {
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cases.push(junk);
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}
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for junk in junk_values().into_iter().take(12) {
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cases.push(junk);
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}
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let mut failures = vec![];
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for params in cases {
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let r = catch_quiet(|| rpc(&mut s, 2, "completion/complete", params.clone()));
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match r {
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Err(p) => failures.push(format!("PANIC {params}: {p}")),
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Ok(v) => {
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assert!(v.get("error").is_none(), "{params}: {v}");
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let completion = &v["result"]["completion"];
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let values = completion["values"].as_array().unwrap_or_else(|| panic!("{params}: no values"));
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assert!(values.len() <= 100, "{params}: {} values", values.len());
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assert!(values.iter().all(Value::is_string), "{params}: {v}");
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if let Some(total) = completion["total"].as_u64() {
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assert!(total >= values.len() as u64, "{params}: {v}");
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}
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assert_eq!(completion["hasMore"], total_exceeds(completion), "{params}: {v}");
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}
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}
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}
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assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
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}
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/// `hasMore` is set exactly when the catalogue held more than we sent.
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fn total_exceeds(completion: &Value) -> Value {
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let sent = completion["values"].as_array().map_or(0, Vec::len);
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json!(completion["total"].as_u64().is_some_and(|t| t > sent as u64))
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}
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fn templates(s: &mut Server) -> Vec<Value> {
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rpc(s, 9, "resources/templates/list", json!({}))["result"]["resourceTemplates"].as_array().unwrap().clone()
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}
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/// Every template lists with a variable, and reading it answers JSON or a clean error.
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#[test]
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fn resource_templates_are_addressable() {
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let mut s = server();
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let mut failures = vec![];
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for t in templates(&mut s) {
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let uri = t["uriTemplate"].as_str().unwrap();
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assert!(uri.contains('{') && uri.ends_with('}'), "{t}");
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assert!(t["description"].as_str().unwrap().len() > 20, "{t}");
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assert!(t["mimeType"].is_string(), "{t}");
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// A template with its variable left empty, filled with junk, and with a real value.
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let prefix = uri.split('{').next().unwrap();
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let mut uris = vec![prefix.to_string(), format!("{prefix}{{"), format!("{prefix}%20"), format!("{prefix}-1")];
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let made = call(&mut s, "draw_shape", json!({"shape": "rectangle", "x": 1, "y": 1, "width": 20, "height": 20}));
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if let Some(id) =
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made["result"]["content"][0]["text"].as_str().and_then(|t| serde_json::from_str::<Value>(t).ok()).and_then(|v| v["id"].as_i64())
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{
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uris.push(format!("{prefix}{id}"));
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}
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for uri in uris {
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let r = catch_quiet(|| rpc(&mut s, 10, "resources/read", json!({"uri": uri.clone()})));
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match r {
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Err(p) => failures.push(format!("PANIC {uri}: {p}")),
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Ok(v) => {
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if let Some(text) = v["result"]["contents"][0]["text"].as_str() {
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serde_json::from_str::<Value>(text).unwrap_or_else(|e| panic!("{uri} is not JSON: {e}"));
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} else {
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let code = v["error"]["code"].as_i64().unwrap_or_default();
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assert!(code == -32602 || code == -32002, "{uri}: {v}");
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}
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}
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}
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}
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}
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assert!(failures.is_empty(), "{}", failures.join("\n"));
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}
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/// Anything a client may send for the prompts, completion, logging and template methods leaves the
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/// server answering and the document valid.
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#[test]
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fn the_new_methods_survive_junk_and_keep_the_document_valid() {
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let mut failures = vec![];
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let mut s = server();
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rpc(&mut s, 1, "tools/call", json!({"name": "draw_shape", "arguments": {"shape": "rectangle", "x": 0, "y": 0, "width": 30, "height": 20}}));
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let before = doc_json(&document(&mut s));
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let mut cases: Vec<(&str, Value)> = vec![];
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for uri in ["vectorcraft://document", "vectorcraft://object/1", "vectorcraft://nope", "", "x://y", "%"] {
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cases.push(("resources/read", json!({"uri": uri})));
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cases.push(("resources/read", json!({})));
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cases.push(("resources/read", json!({"uri": 5})));
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}
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for level in [json!("debug"), json!("emergency"), json!(null), json!("shouty"), json!(5), json!([]), json!({})] {
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cases.push(("logging/setLevel", json!({"level": level})));
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}
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cases.push(("logging/setLevel", json!({})));
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for name in [json!("poster"), json!("nope"), json!(""), json!(5), json!(null), json!([])] {
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cases.push(("prompts/get", json!({"name": name})));
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cases.push(("prompts/get", json!({"name": name, "arguments": []})));
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}
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for ref_ in [
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json!({"type": "ref/prompt", "name": "poster"}),
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json!({"type": "ref/resource", "uri": "vectorcraft://object/{id}"}),
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json!({"type": "ref/other"}),
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json!("x"),
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json!([]),
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] {
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cases.push(("completion/complete", json!({"ref": ref_, "argument": {"name": "brief", "value": ""}})));
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cases.push(("completion/complete", json!({"ref": ref_})));
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}
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for (method, params) in cases {
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let r = catch_quiet(|| rpc(&mut s, 11, method, params.clone()));
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match r {
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Err(p) => failures.push(format!("PANIC {method} {params}: {p}")),
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Ok(v) => {
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assert!(v.get("result").is_some() != v.get("error").is_some(), "{method} {params}: {v}");
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// Whatever it answered, every notification it queued is a JSON-RPC message.
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for line in s.take_notifications() {
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let n: Value = serde_json::from_str(&line).unwrap_or_else(|e| panic!("bad notification {line}: {e}"));
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assert_eq!(n["jsonrpc"], "2.0", "{n}");
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assert_eq!(n["method"], "notifications/message", "{n}");
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assert!(n["params"]["level"].is_string() && n["params"]["data"].is_string(), "{n}");
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}
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check_document(&document(&mut s)).unwrap_or_else(|e| failures.push(format!("{method} {params}: {e}")));
|
||
}
|
||
}
|
||
}
|
||
// None of these edit the document, so it must be exactly as it was.
|
||
assert_eq!(doc_json(&document(&mut s)), before, "a read-only method changed the document");
|
||
assert!(failures.is_empty(), "{} failures:\n{}", failures.len(), failures.join("\n"));
|
||
}
|
||
|
||
/// Every capability the server advertises is one it actually answers.
|
||
#[test]
|
||
fn advertised_capabilities_all_answer() {
|
||
let mut s = server();
|
||
let caps = rpc(&mut s, 1, "initialize", json!({}))["result"]["capabilities"].clone();
|
||
let checks: Vec<(&str, &str, Value)> = vec![
|
||
("tools", "tools/list", json!({})),
|
||
("prompts", "prompts/list", json!({})),
|
||
("completions", "completion/complete", json!({"ref": {"type": "ref/prompt", "name": "poster"}, "argument": {"name": "brief", "value": ""}})),
|
||
("logging", "logging/setLevel", json!({"level": null})),
|
||
("resources", "resources/list", json!({})),
|
||
("resources", "resources/templates/list", json!({})),
|
||
("resources", "resources/read", json!({"uri": doc_uri_json(&mut s)})),
|
||
];
|
||
for (capability, method, params) in checks {
|
||
assert!(caps[capability].is_object(), "{capability} is not advertised: {caps}");
|
||
assert!(rpc(&mut s, 2, method, params).get("error").is_none(), "{method} is advertised but does not answer");
|
||
}
|
||
// And nothing is advertised that the server does not answer.
|
||
assert!(caps["resources"].get("subscribe").is_none(), "subscribe is advertised but not implemented: {caps}");
|
||
assert_eq!(err_code(&mut s, 3, "resources/subscribe", json!({"uri": "vectorcraft://document"})), -32601);
|
||
}
|
||
|
||
/// A capability the server advertises must be one it answers, and one it does not advertise must
|
||
/// not be there.
|
||
fn err_code(s: &mut Server, id: u64, method: &str, params: Value) -> i64 {
|
||
let v = rpc(s, id, method, params);
|
||
v.get("error").and_then(|e| e["code"].as_i64()).unwrap_or_else(|| panic!("{method} should have failed: {v}"))
|
||
}
|
||
|
||
#[test]
|
||
fn undo_redo_tools_restore_documents() {
|
||
let mut s = server();
|
||
let d0 = doc_json(&document(&mut s));
|
||
let v = call(&mut s, "draw_shape", json!({"shape": "rectangle", "x": 10, "y": 10, "width": 50, "height": 40, "fill": "#ff0000"}));
|
||
assert!(v["result"]["isError"] != json!(true), "{v}");
|
||
call(&mut s, "draw_shape", json!({"shape": "star", "cx": 100, "cy": 100, "radius1": 40, "radius2": 20}));
|
||
let d2 = doc_json(&document(&mut s));
|
||
// draw + paint are separate undo steps; undo until the original document is back.
|
||
let mut n = 0;
|
||
while doc_json(&document(&mut s)) != d0 {
|
||
let v = call(&mut s, "undo", json!({}));
|
||
assert!(v["result"]["isError"] != json!(true), "undo failed early: {v}");
|
||
n += 1;
|
||
assert!(n < 20);
|
||
}
|
||
for _ in 0..n {
|
||
call(&mut s, "redo", json!({}));
|
||
}
|
||
assert_eq!(doc_json(&document(&mut s)), d2);
|
||
}
|
||
|
||
proptest! {
|
||
#![proptest_config(ProptestConfig { cases: 24, failure_persistence: None, ..ProptestConfig::default() })]
|
||
|
||
/// Random engine command sequences through `run_command` keep the document valid and the
|
||
/// server responsive; the result equals running the same commands on a local session.
|
||
#[test]
|
||
fn run_command_sequences_match_local_session(ops in arb_ops(5..40)) {
|
||
let mut srv = server();
|
||
// Match the headless default document, dated as it is (File Info dates come from the clock).
|
||
let d_remote = doc_json(&document(&mut srv));
|
||
let mut local = vectorcraft_engine::Session::new();
|
||
let created = &d_remote["metadata"]["created"];
|
||
vectorcraft_testkit::fixtures::exec(&mut local, "file.new", json!({"width": 612, "height": 792, "created": created}));
|
||
let d_local = doc_json(&local.doc().unwrap().doc);
|
||
prop_assume!(d_remote == d_local);
|
||
for op in &ops {
|
||
let (id, params) = op.command(&local);
|
||
let a = local.execute(&id, ¶ms).is_ok();
|
||
let v = call(&mut srv, "run_command", json!({"command": id, "params": params}));
|
||
let b = v["result"]["isError"] != json!(true);
|
||
prop_assert_eq!(a, b, "`{}` {}: local ok={} mcp ok={} ({})", id, params, a, b, v);
|
||
}
|
||
let got = document(&mut srv);
|
||
check_document(&got).map_err(TestCaseError::fail)?;
|
||
{ let (g, l) = (doc_json(&got), doc_json(&local.doc().unwrap().doc)); // 1e-12: JSON text round trips aren't bit-exact (serde_json without float_roundtrip; see
|
||
// crates/format/tests/prop_format.rs::bug_f64_bit_exact_roundtrip).
|
||
prop_assert!(vectorcraft_testkit::invariants::json_approx_eq(&g, &l, 1e-12), "MCP and local sessions diverged: {}", vectorcraft_testkit::invariants::first_diff(&l, &g, "$")); }
|
||
}
|
||
}
|
||
|
||
/// Tools driven directly against a Headless backend never leave an interaction open or corrupt
|
||
/// the session, whatever the arguments. (A gesture that stops after `drag` legitimately stays open
|
||
/// so an agent can continue it in the next call; that case is not listed.)
|
||
#[test]
|
||
fn tools_never_leave_interactions_open() {
|
||
use vectorcraft_mcp::call_tool;
|
||
use vectorcraft_testkit::invariants::check_session;
|
||
let cases = [
|
||
("pointer_gesture", json!({"tool": "rectangle", "events": [{"kind": "down", "x": 10, "y": 10}, {"kind": "bogus", "x": 50, "y": 50}]})),
|
||
("pointer_gesture", json!({"tool": "pen", "events": [{"kind": "down", "x": 10, "y": 10}, {"kind": "drag", "x": "a", "y": 50}]})),
|
||
(
|
||
"pointer_gesture",
|
||
json!({"tool": "selection", "events": [{"kind": "down", "x": 1e308, "y": -1e308}, {"kind": "drag", "x": 1e308, "y": 0}, {"kind": "up", "x": 0, "y": 0}]}),
|
||
),
|
||
("pointer_gesture", json!({"tool": "ellipse", "events": [{"kind": "up", "x": 0, "y": 0}]})),
|
||
("press_key", json!({"key": "Escape"})),
|
||
(
|
||
"run_command",
|
||
json!({"command": "command.batch", "params": {"commands": [{"command": "shape.rectangle", "params": {"x": 0, "y": 0, "width": 5, "height": 5}}, {"command": "nope"}]}}),
|
||
),
|
||
];
|
||
let mut failures = vec![];
|
||
for (name, args) in cases {
|
||
let mut h = Headless::with_document();
|
||
let r = catch_quiet(|| call_tool(&mut h, name, &args));
|
||
if r.is_err() {
|
||
failures.push(format!("PANIC {name} {args}"));
|
||
continue;
|
||
}
|
||
// A finished gesture sequence must not leave a drag half-applied.
|
||
if h.session.in_interaction() {
|
||
failures.push(format!("{name} {args}: interaction left open"));
|
||
}
|
||
if let Err(e) = check_session(&h.session) {
|
||
failures.push(format!("{name} {args}: {e}"));
|
||
}
|
||
}
|
||
assert!(failures.is_empty(), "{}", failures.join("\n"));
|
||
}
|