Run clippy on test suite too

Author: dtolnay

.github/workflows/ci.yml

@@ -45,4 +45,4 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: dtolnay/rust-toolchain@clippy
-      - run: cargo clippy -- -Dclippy::all -Dclippy::pedantic
+      - run: cargo clippy --tests -- -Dclippy::all -Dclippy::pedantic

tests/test.rs

@@ -1,4 +1,13 @@
-#![cfg_attr(feature = "cargo-clippy", allow(blacklisted_name))]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    allow(
+        blacklisted_name,
+        let_underscore_drop,
+        shadow_unrelated,
+        unseparated_literal_suffix,
+        used_underscore_binding
+    )
+)]
 
 use std::borrow::Cow;
 use std::collections::BTreeSet;