Skip rust-test-project-located' without cargo and avoid find-file' in test.

Author: Aankhen

rust-mode-tests.el

@@ -2651,13 +2651,11 @@ extern \"rust-intrinsic\" fn five() {
       "five"))))
 
 (ert-deftest rust-test-project-located ()
-  (lexical-let* ((this-dir default-directory)
-                 (test-dir (expand-file-name "test-project" this-dir))
+  (skip-unless (executable-find "cargo"))
+  (lexical-let* ((test-dir (expand-file-name "test-project" default-directory))
                  (manifest-file (expand-file-name "Cargo.toml" test-dir)))
-    (find-file (expand-file-name "test-project/foo.rs"))
-    (unwind-protect
-        (should (equal (expand-file-name (rust-buffer-project)) manifest-file))
-      (kill-buffer))))
+    (let ((default-directory test-dir))
+      (should (equal (expand-file-name (rust-buffer-project)) manifest-file)))))
 
 ;; If electric-pair-mode is available, load it and run the tests that use it.  If not,
 ;; no error--the tests will be skipped.