Test display of code lens

test/lsp-mock-server-test.el

@@ -835,4 +835,23 @@ line 3 words here and here
           (should (equal (line-number-at-pos) (1+ hint-line)))
           (should (equal (current-column) hint-col))))))))
 
+(ert-deftest lsp-test-server-provides-code-lens ()
+  "lsp-mode accepts code lenses from the server and displays them."
+  (let ((line 2))
+    (lsp-test-schedule-response
+     "textDocument/codeLens"
+     (vconcat (list `(:range (:start (:line ,line :character 0)
+                              :end (:line ,line :character 1))
+                      :command (:title "My command"
+                                :command "myCommand")))))
+    (lsp-mock-run-with-mock-server
+     (lsp-test-sync-wait (lsp-test-all-overlays 'lsp-lens))
+     (let ((lenses (lsp-test-all-overlays 'lsp-lens)))
+       (should (eq (length lenses) 1))
+       (message "%s" (overlay-properties (car lenses)))
+       (should (string-match-p "My command"
+                               (overlay-get (car lenses) 'after-string)))
+       (goto-char (overlay-start (car lenses)))
+       (should (equal (line-number-at-pos) (- line 1)))))))
+
 ;;; lsp-mock-server-test.el ends here

test/mock-lsp-server.el

@@ -84,7 +84,8 @@
                                 :codeActionProvider t
                                 :declarationProvider t
                                 :definitionProvider t
-                                :inlayHintProvider t)
+                                :inlayHintProvider t
+                                :codeLensProvider (:resolveProvider ()))
   "Capabilities of the server.")
 
 (defun greeting (id)