test(pkgid): Include test for ambiguous spec

Author: epage

tests/testsuite/pkgid.rs

@@ -80,6 +80,19 @@ Did you mean one of these?
 error: package ID specification `crates_io` did not match any packages
 
 <tab>Did you mean `crates-io`?
+",
+        )
+        .run();
+
+    // Ambiguous.
+    p.cargo("pkgid two-ver")
+        .with_status(101)
+        .with_stderr(
+            "\
+error: There are multiple `two-ver` packages in your project, and the specification `two-ver` is ambiguous.
+Please re-run this command with `-p <spec>` where `<spec>` is one of the following:
+  two-ver@0.1.0
+  two-ver@0.2.0
 ",
         )
         .run();