Fix test not to rely on `cargo` in PATH.
Fix test not to rely on `cargo` in PATH.

rustyhorde/cargo,rustyhorde/cargo,eminence/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo,nipunn1313/cargo,nipunn1313/cargo,rust-lang/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,eminence/cargo