fix test

Author: karlseguin

src/cdp/page.zig

@@ -274,13 +274,13 @@ test "cdp.page: getFrameTree" {
         try ctx.expectSentError(-31998, "BrowserContextNotLoaded", .{ .id = 10 });
     }
 
-    const bc = try ctx.loadBrowserContext(.{ .id = "BID-9" });
+    const bc = try ctx.loadBrowserContext(.{ .id = "BID-9", .target_id = "TID-3" });
     {
         try ctx.processMessage(.{ .id = 11, .method = "Page.getFrameTree" });
         try ctx.expectSentResult(.{
             .frameTree = .{
                 .frame = .{
-                    .id = bc.frame_id,
+                    .id = "TID-3",
                     .loaderId = bc.loader_id,
                     .url = bc.url,
                     .domainAndRegistry = "",

src/cdp/testing.zig

@@ -147,6 +147,7 @@ const TestContext = struct {
 
     const BrowserContextOpts = struct {
         id: ?[]const u8 = null,
+        target_id: ?[]const u8 = null,
         session_id: ?[]const u8 = null,
     };
     pub fn loadBrowserContext(self: *TestContext, opts: BrowserContextOpts) !*main.BrowserContext(TestCDP) {
@@ -163,6 +164,10 @@ const TestContext = struct {
             bc.id = id;
         }
 
+        if (opts.target_id) |tid| {
+            bc.target_id = tid;
+        }
+
         if (opts.session_id) |sid| {
             bc.session_id = sid;
         }