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diff --git a/tests/test-ai-term--next-no-agents.el b/tests/test-ai-term--next-no-agents.el
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+;;; test-ai-term--next-no-agents.el --- cj/ai-term-next no-agents fallback -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; When no agent buffers are open, `cj/ai-term-next' (bound to M-SPC) launches
+;; the project picker (`cj/ai-term-pick-project') to start the first agent,
+;; instead of signalling a `user-error'.  The swap key thus doubles as a
+;; "start an agent" key when there is nothing to swap to.
+
+;;; 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-next-no-agents-launches-picker ()
+  "Error: no agents open -> launches the picker instead of erroring."
+  (let ((picked 0))
+    (cl-letf (((symbol-function 'cj/--ai-term-agent-buffers) (lambda (&rest _) nil))
+              ((symbol-function 'cj/--ai-term-displayed-agent-window) (lambda (&rest _) nil))
+              ((symbol-function 'cj/ai-term-pick-project) (lambda (&rest _) (setq picked (1+ picked)))))
+      (cj/ai-term-next)
+      (should (= picked 1)))))
+
+(ert-deftest test-ai-term-next-no-agents-does-not-signal ()
+  "Error: no agents open -> returns normally, no user-error raised."
+  (cl-letf (((symbol-function 'cj/--ai-term-agent-buffers) (lambda (&rest _) nil))
+            ((symbol-function 'cj/--ai-term-displayed-agent-window) (lambda (&rest _) nil))
+            ((symbol-function 'cj/ai-term-pick-project) (lambda (&rest _) nil)))
+    (should (progn (cj/ai-term-next) t))))
+
+(provide 'test-ai-term--next-no-agents)
+;;; test-ai-term--next-no-agents.el ends here