test(check): Verify build-dir lock is taken on check builds

Author: ranger-ross

tests/testsuite/check.rs

@@ -1719,6 +1719,28 @@ fn check_build_should_not_lock_artifact_dir() {
     assert!(!p.root().join("target/debug/.cargo-lock").exists());
 }
 
+#[cargo_test]
+fn check_build_should_not_lock_artifact_dir_when_build_dir_is_not_same_dir() {
+    let p = project()
+        .file("src/main.rs", r#"fn main() { println!("Hello, World!") }"#)
+        .file(
+            ".cargo/config.toml",
+            r#"
+            [build]
+            target-dir = "target-dir"
+            build-dir = "build-dir"
+            "#,
+        )
+        .build();
+
+    p.cargo("check").enable_mac_dsym().run();
+
+    // Verify we did NOT take the build-dir lock
+    assert!(!p.root().join("target-dir/debug/.cargo-lock").exists());
+    // Verify we did take the build-dir lock
+    assert!(p.root().join("build-dir/debug/.cargo-lock").exists());
+}
+
 // Regression test for #16305
 #[cargo_test]
 fn check_build_should_not_uplift_proc_macro_dylib_deps() {