Finish the implementation of related-tests

add a review comment about the preview function

clients/lsp-rust.el

@@ -973,12 +973,12 @@ Cannot reuse `lsp-rust-analyzer--select-runnable' because the runnables endpoint
 responds with Runnable[], while relatedTests responds with TestInfo[], which is a wrapper
 over runnable. Also, this method doesn't set the `lsp-rust-analyzer--last-runnable' variable"
   (-if-let* ((resp (lsp-rust-analyzer--related-tests))
-             (runnables (mapcar (lambda (runnable) (gethash "runnable" runnable)) resp)))
-             ;; TODO use dolist or some other iterator to extract all of them
-             ;; since the endpoint returns a list of hash tables that
-             ;; stores &rust-analyzer:Runnable as a value under key
-             ;; "runnable"
-             ;; we need to unpack them first
+             (runnables (seq-map
+                         (-lambda ((&rust-analyzer:RelatedTests :runnable)) runnable)
+                         resp)))
+      ;; TODO Is it possible to bind
+      ;; C-SPC preview similar to what ivy-configured doom has with
+      ;; ivy-call-and-recenter
       (lsp--completing-read
        "Select test: "
        runnables