diff --git a/rust-cargo.el b/rust-cargo.el
index d323b5d..a16618f 100644
--- a/rust-cargo.el
+++ b/rust-cargo.el
@@ -129,10 +129,18 @@ output buffer will be in comint mode, i.e. interactive."
   (interactive "P")
   (rust--compile comint "%s run --release" rust-cargo-bin))
 
-(defun rust-test ()
-  "Test using `cargo test`"
-  (interactive)
-  (rust--compile nil "%s test %s" rust-cargo-bin rust-cargo-default-arguments))
+(defun rust-test (&optional arg)
+  "Test using `cargo test`.
+If prefixed with `C-u`, pass additional arguments to the command (from a string read from the minibuffer)."
+  (interactive "P")
+  (let ((test-command
+         (if arg
+             (progn
+               (let ((custom-arg
+                      (string-trim (read-string "Enter Arguments: "))))
+                 (concat "%s test " custom-arg " %s")))
+           "%s test %s")))
+    (rust--compile nil test-command rust-cargo-bin rust-cargo-default-arguments)))
 
 (defun rust-run-clippy ()
   "Run `cargo clippy'."