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+;;; test-ai-term--default-geometry.el --- Tests for host-aware display defaults -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; ai-term's default display geometry is host-aware: a laptop opens the
+;; agent from the bottom (75% height), a desktop opens it from the right
+;; (50% width).  `cj/--ai-term-default-direction' and
+;; `cj/--ai-term-default-size' encapsulate the `env-laptop-p' branch;
+;; they feed the default fallbacks in `cj/--ai-term-capture-state' and
+;; `cj/--ai-term-display-saved'.
+;;
+;; `env-laptop-p' is stubbed per-test so the assertions are deterministic
+;; regardless of the host the suite runs on.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'ai-term)
+
+(ert-deftest test-ai-term--default-direction-laptop ()
+  "Normal: on a laptop the default direction is `below'."
+  (cl-letf (((symbol-function 'env-laptop-p) (lambda () t)))
+    (should (eq (cj/--ai-term-default-direction) 'below))))
+
+(ert-deftest test-ai-term--default-direction-desktop ()
+  "Normal: on a desktop the default direction is `right'."
+  (cl-letf (((symbol-function 'env-laptop-p) (lambda () nil)))
+    (should (eq (cj/--ai-term-default-direction) 'right))))
+
+(ert-deftest test-ai-term--default-size-laptop ()
+  "Normal: on a laptop the default size is `cj/ai-term-laptop-height'."
+  (let ((cj/ai-term-laptop-height 0.75)
+        (cj/ai-term-desktop-width 0.5))
+    (cl-letf (((symbol-function 'env-laptop-p) (lambda () t)))
+      (should (= (cj/--ai-term-default-size) 0.75)))))
+
+(ert-deftest test-ai-term--default-size-desktop ()
+  "Normal: on a desktop the default size is `cj/ai-term-desktop-width'."
+  (let ((cj/ai-term-laptop-height 0.75)
+        (cj/ai-term-desktop-width 0.5))
+    (cl-letf (((symbol-function 'env-laptop-p) (lambda () nil)))
+      (should (= (cj/--ai-term-default-size) 0.5)))))
+
+(ert-deftest test-ai-term--default-size-respects-custom-values ()
+  "Boundary: the helper returns the customized values, not the literals."
+  (let ((cj/ai-term-laptop-height 0.6)
+        (cj/ai-term-desktop-width 0.33))
+    (cl-letf (((symbol-function 'env-laptop-p) (lambda () t)))
+      (should (= (cj/--ai-term-default-size) 0.6)))
+    (cl-letf (((symbol-function 'env-laptop-p) (lambda () nil)))
+      (should (= (cj/--ai-term-default-size) 0.33)))))
+
+(provide 'test-ai-term--default-geometry)
+;;; test-ai-term--default-geometry.el ends here