Enhance input handling in process wrapper to ensure newline terminati…

…on and improve error handling

hstest/testing/process_wrapper.py

@@ -275,9 +275,21 @@ def is_finished(self, need_wait_output=True) -> bool:
         return not self._alive
 
     def provide_input(self, stdin: str) -> None:
-        if self._use_byte_stream:
-            stdin = stdin.encode()
-        self.process.stdin.write(stdin)
+        if not stdin.endswith('\n'):
+            stdin += '\n'
+        try:
+            if self._use_byte_stream:
+                stdin = stdin.encode('utf-8')
+                self.process.stdin.write(stdin)
+                self.process.stdin.flush()
+            else:
+                self.process.stdin.write(stdin)
+                self.process.stdin.flush()
+        except IOError as e:
+            # Handle pipe errors gracefully
+            if not self._alive:
+                return
+            raise e
 
     def terminate(self) -> None:
         OutputHandler.print("Terminate called")