try with 'set' instead 'echo'

Author: theskumar

tests/test_cli.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from pathlib import Path
 from typing import Optional
 
@@ -238,14 +239,27 @@ def test_run_with_existing_variable_not_overridden(tmp_path):
 def test_run_with_none_value(tmp_path):
     with pushd(tmp_path):
         (tmp_path / ".env").write_text("a=b\nc")
+        # Use sys.executable to run the command via Python directly
         if IS_WINDOWS:
-            printenv_cmd = ["dotenv", "run", "cmd", "/c", "echo", "%a%"]
+            printenv_cmd = [
+                sys.executable,
+                "-m",
+                "dotenv",
+                "run",
+                "cmd",
+                "/c",
+                "set",
+                "a",
+            ]
         else:
             printenv_cmd = ["dotenv", "run", "printenv", "a"]
 
         result = run_command(printenv_cmd)
-
-        assert result == "b\n"
+        if IS_WINDOWS:
+            # Windows 'set' command includes variable name, extract just the value
+            assert result.strip().endswith("=b")
+        else:
+            assert result == "b\n"
 
 
 def test_run_with_other_env(dotenv_path):