fix: missing_inline_in_public_items fail to fulfill expect in --test build

Author: profetia

clippy_lints/src/missing_inline.rs

@@ -1,4 +1,5 @@
 use clippy_utils::diagnostics::span_lint;
+use clippy_utils::lint_is_expected;
 use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_hir as hir;
 use rustc_hir::Attribute;
@@ -88,7 +89,14 @@ declare_lint_pass!(MissingInline => [MISSING_INLINE_IN_PUBLIC_ITEMS]);
 
 impl<'tcx> LateLintPass<'tcx> for MissingInline {
     fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx hir::Item<'_>) {
-        if it.span.in_external_macro(cx.sess().source_map()) || is_executable_or_proc_macro(cx) {
+        if it.span.in_external_macro(cx.sess().source_map()) {
+            return;
+        }
+
+        if is_executable_or_proc_macro(cx)
+            // Allow the lint if it is expected, when building with `--test`
+            && !(cx.sess().is_test_crate() && lint_is_expected(cx, it.owner_id, MISSING_INLINE_IN_PUBLIC_ITEMS))
+        {
             return;
         }
 

clippy_utils/src/lib.rs

@@ -3567,3 +3567,16 @@ pub fn potential_return_of_enclosing_body(cx: &LateContext<'_>, expr: &Expr<'_>)
     // enclosing body.
     false
 }
+
+/// Checks if the given lint is `expected`:
+/// ```rust
+/// #[expect(clippy::lint_name)]
+/// fn foo() {}
+/// ```
+pub fn lint_is_expected(cx: &LateContext<'_>, owner_id: OwnerId, lint: &'static Lint) -> bool {
+    cx.tcx
+        .shallow_lint_levels_on(owner_id)
+        .specs
+        .iter()
+        .any(|(_, lint_map)| lint_map.iter().any(|(lint_id, _)| lint_id.lint.name == lint.name))
+}

tests/ui/missing_inline_test_crate.rs

@@ -0,0 +1,12 @@
+//@compile-flags: --test
+//@check-pass
+#![warn(clippy::missing_inline_in_public_items)]
+#![crate_type = "dylib"]
+// When denying at the crate level, be sure to not get random warnings from the
+// injected intrinsics by the compiler.
+#![allow(dead_code)]
+
+#[expect(clippy::missing_inline_in_public_items)]
+pub fn foo() -> u32 {
+    0
+}