Fix failing test

Author: popzxc

crates/rust-analyzer/tests/rust-analyzer/main.rs

@@ -107,6 +107,7 @@ fn main() {}
             "args": {
               "cargoArgs": ["test", "--package", "foo", "--test", "spam"],
               "executableArgs": ["test_eggs", "--exact", "--nocapture"],
+              "cargoExtraArgs": [],
               "workspaceRoot": server.path().join("foo")
             },
             "kind": "cargo",