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test: add waitForSelector MCP tool tests

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Add three test cases covering:
- Immediate match on an already-present element
- Polling match on an element added after a 200ms setTimeout delay
- Timeout error on a non-existent element with a short timeout

Add mcp_wait_for_selector.html test fixture that injects a #delayed
element after 200ms via setTimeout for the polling test.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Matt Van Horn
2026-03-21 06:40:43 -07:00
parent 6008187c78
commit e9bed18cd8
2 changed files with 115 additions and 0 deletions
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14
src/browser/tests/mcp_wait_for_selector.html Normal file
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@@ -0,0 +1,14 @@
<!DOCTYPE html>
<html>
<body>
<div id="existing">Already here</div>
<script>
setTimeout(function() {
var el = document.createElement("div");
el.id = "delayed";
el.textContent = "Appeared after delay";
document.body.appendChild(el);
}, 200);
</script>
</body>
</html>

101
src/mcp/tools.zig
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@@ -723,3 +723,104 @@ test "MCP - Actions: click, fill, scroll" {
try testing.expect(result.isTrue()); try testing.expect(result.isTrue());
} }
test "MCP - waitForSelector: existing element" {
defer testing.reset();
const allocator = testing.allocator;
const app = testing.test_app;
var out_alloc: std.io.Writer.Allocating = .init(testing.arena_allocator);
defer out_alloc.deinit();
var server = try Server.init(allocator, app, &out_alloc.writer);
defer server.deinit();
const aa = testing.arena_allocator;
const page = try server.session.createPage();
const url = "http://localhost:9582/src/browser/tests/mcp_wait_for_selector.html";
try page.navigate(url, .{ .reason = .address_bar, .kind = .{ .push = null } });
_ = server.session.wait(.{});
// waitForSelector on an element that already exists returns immediately
const msg =
\\{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"waitForSelector","arguments":{"selector":"#existing","timeout":2000}}}
;
try router.handleMessage(server, aa, msg);
try testing.expectJson(
\\{
\\ "id": 1,
\\ "result": {
\\ "content": [
\\ { "type": "text" }
\\ ]
\\ }
\\}
, out_alloc.writer.buffered());
}
test "MCP - waitForSelector: delayed element" {
defer testing.reset();
const allocator = testing.allocator;
const app = testing.test_app;
var out_alloc: std.io.Writer.Allocating = .init(testing.arena_allocator);
defer out_alloc.deinit();
var server = try Server.init(allocator, app, &out_alloc.writer);
defer server.deinit();
const aa = testing.arena_allocator;
const page = try server.session.createPage();
const url = "http://localhost:9582/src/browser/tests/mcp_wait_for_selector.html";
try page.navigate(url, .{ .reason = .address_bar, .kind = .{ .push = null } });
_ = server.session.wait(.{});
// waitForSelector on an element added after 200ms via setTimeout
const msg =
\\{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"waitForSelector","arguments":{"selector":"#delayed","timeout":5000}}}
;
try router.handleMessage(server, aa, msg);
try testing.expectJson(
\\{
\\ "id": 1,
\\ "result": {
\\ "content": [
\\ { "type": "text" }
\\ ]
\\ }
\\}
, out_alloc.writer.buffered());
}
test "MCP - waitForSelector: timeout" {
defer testing.reset();
const allocator = testing.allocator;
const app = testing.test_app;
var out_alloc: std.io.Writer.Allocating = .init(testing.arena_allocator);
defer out_alloc.deinit();
var server = try Server.init(allocator, app, &out_alloc.writer);
defer server.deinit();
const aa = testing.arena_allocator;
const page = try server.session.createPage();
const url = "http://localhost:9582/src/browser/tests/mcp_wait_for_selector.html";
try page.navigate(url, .{ .reason = .address_bar, .kind = .{ .push = null } });
_ = server.session.wait(.{});
// waitForSelector with a short timeout on a non-existent element should error
const msg =
\\{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"waitForSelector","arguments":{"selector":"#nonexistent","timeout":100}}}
;
try router.handleMessage(server, aa, msg);
try testing.expectJson(
\\{
\\ "id": 1,
\\ "error": {}
\\}
, out_alloc.writer.buffered());
}