fix macro by denying trailing slashes. also other stuff

crates/test-programs/wasi-tests/src/config.rs

@@ -2,6 +2,7 @@ pub struct TestConfig {
     errno_mode: ErrnoMode,
     no_dangling_symlinks: bool,
     no_fd_allocate: bool,
+    no_rename_dir_to_empty_dir: bool,
 }
 
 enum ErrnoMode {
@@ -21,10 +22,12 @@ impl TestConfig {
         };
         let no_dangling_symlinks = std::env::var("NO_DANGLING_SYMLINKS").is_ok();
         let no_fd_allocate = std::env::var("NO_FD_ALLOCATE").is_ok();
+        let no_rename_dir_to_empty_dir = std::env::var("NO_RENAME_DIR_TO_EMPTY_DIR").is_ok();
         TestConfig {
             errno_mode,
             no_dangling_symlinks,
             no_fd_allocate,
+            no_rename_dir_to_empty_dir,
         }
     }
     pub fn errno_expect_unix(&self) -> bool {
@@ -45,4 +48,7 @@ impl TestConfig {
     pub fn support_fd_allocate(&self) -> bool {
         !self.no_fd_allocate
     }
+    pub fn support_rename_dir_to_empty_dir(&self) -> bool {
+        !self.no_rename_dir_to_empty_dir
+    }
 }