sdl: main + tests additions

1 files changed, 22 insertions, 0 deletions

diff --git a/tests.zig b/tests.zig
index 83e42dad..0a81feb6 100644
--- a/tests.zig
+++ b/tests.zig
@@ -589,4 +589,26 @@ pub fn main(init: std.process.Init) !void {
             return error.ColumnCollapseReflow;
         }
     }
+
+    // 18. DEVICE-QUERY REPLIES: full-screen apps (nushell/reedline, helix, fzf — all
+    //     crossterm) send a DSR cursor-position report (ESC[6n) at startup and BLOCK
+    //     until the terminal answers. pardes must reply into the pty; without the
+    //     write_pty effect the reply is dropped and the app spins forever ("nushell
+    //     never opens"). Mode-independent. Run a command that (in raw mode, like a
+    //     real app) emits ESC[6n and only echoes its marker AFTER it reads the reply
+    //     — the marker appears only if pardes answered the query.
+    {
+        var hs8 = try Harness.init(gpa, exe.ptr, 24, 80);
+        defer hs8.deinit();
+        try hs8.expectWaitFor("build.zig", 8000, "fresh terminal never auto-ls'd");
+        try hs8.send("\x02"); // normal -> tty
+        try hs8.pump(600);
+        // -icanon so the reply's bytes reach `read` without a newline; read until the
+        // reply terminator 'R' (ESC[<row>;<col>R) with a timeout, and print the marker
+        // ONLY if the read SUCCEEDS (a reply arrived). The marker is split with ''
+        // so it appears solely in the command's OUTPUT, never in the echoed command
+        // line — otherwise the on-screen command text would false-match it.
+        try hs8.send("stty -icanon -echo min 1 time 0; printf '\\033[6n'; read -r -d R -t 3 _c && printf 'ZZCPR''OK\\n'; stty sane\r");
+        try hs8.expectWaitFor("ZZCPROK", 8000, "app blocked on its ESC[6n query — pardes dropped the reply (device queries not answered)");
+    }
 }