Add test, update docs and changelog

Fixes #23

CHANGELOG.org

@@ -21,4 +21,6 @@
 - ~rustic-recompile~ will remember any universal arguments that is
   passed to it.
 - Fix ~rustic-cargo-upgrade~ in the presence of universal arguments.
-- Fix ~rusti-cargo-clippy-rerun~ to use the last used arguments.
+- Fix ~rustic-cargo-clippy-rerun~ to use the last used arguments.
+- Implement ~rustic-babel-display-error-popup~ customization
+  option. Refer the variable docs for more details.

README.md

@@ -672,6 +672,9 @@ Customization:
   of babel process
 - `rustic-babel-auto-wrap-main` wrap body into main function
 - `rustic-babel-default-toolchain` active toolchain for babel blocks
+- `rustic-babel-display-error-popup` displays error popup on
+  compilation failure or when the exit code is non zero. Set it to nil
+  if you want it to be displayed as part of result block.
 
 ### lsp-mode
 

test/rustic-babel-test.el

@@ -61,6 +61,16 @@
     (should (eq (rustic-test-babel-check-results buf) nil))
     (should-not (buffer-live-p rustic-babel-compilation-buffer-name))))
 
+(ert-deftest rustic-test-babel-error-no-popup ()
+  (let* ((string "fn main() {
+                    panic(\"hello world\");
+                  }")
+         (buf (rustic-test-get-babel-block string))
+         (rustic-babel-display-error-popup t)
+         )
+    (rustic-test-babel-execute-block buf)
+    (should (s-contains? "hello world" (rustic-test-babel-check-results buf)))))
+
 (ert-deftest rustic-test-babel-error-results ()
   (let* ((string "fn main() {
                      let v = vec![1, 2, 3];