test: add comprehensive ./ prefix pattern tests

- Add 48 tests for patterns starting with ./
- Fix ./ pattern returning empty (now returns ['.'])
- Fix empty string cwd handling to use process.cwd()
- Test ./ prefix transparency, dotRelative interaction, mark, nodir
- Document known limitation: path normalization not implemented

Author: richiemcilroy

js/index.ts

@@ -210,7 +210,8 @@ function toNativeOptions(options?: GlobOptions): NativeGlobOptions {
   }
 
   return {
-    cwd: rest.cwd ?? process.cwd(),
+    // Use process.cwd() if cwd is undefined, null, or empty string
+    cwd: rest.cwd || process.cwd(),
     ...rest,
     ignore: nativeIgnore,
   }

src/pattern.rs

@@ -1071,6 +1071,12 @@ pub fn preprocess_pattern(pattern: &str) -> String {
         result = result[2..].to_string();
     }
 
+    // If the pattern was just "./" (or ".//" etc), it becomes empty after stripping.
+    // Treat this as "." which matches the current directory.
+    if result.is_empty() && pattern.starts_with("./") {
+        return ".".to_string();
+    }
+
     result
 }