test(pkgid): bad file URL suggestion

Author: weihanglo

tests/testsuite/pkgid.rs

@@ -93,6 +93,19 @@ Did you mean one of these?
 
   two-ver:0.1.0
   two-ver:0.2.0
+",
+        )
+        .run();
+
+    // Bad file URL.
+    p.cargo("pkgid ./Cargo.toml")
+        .with_status(101)
+        .with_stderr(
+            "\
+error: invalid package ID specification: `./Cargo.toml`
+
+Caused by:
+  package ID specification `./Cargo.toml` looks like a file path, maybe try file://[..]/Cargo.toml
 ",
         )
         .run();