add E2E test on windows too

Author: KRRT7

.github/workflows/windows-unit-tests.yml

@@ -10,6 +10,8 @@ jobs:
   windows-unit-tests:
     continue-on-error: true
     runs-on: windows-latest
+    env:
+      PYTHONIOENCODING: utf-8
     steps:
       - uses: actions/checkout@v4
         with:

tests/scripts/end_to_end_test_utilities.py

@@ -88,8 +88,10 @@ def run_codeflash_command(
     test_root = cwd / "tests" / (config.test_framework or "")
 
     command = build_command(cwd, config, test_root, config.benchmarks_root if config.benchmarks_root else None)
+    env = os.environ.copy()
+    env['PYTHONIOENCODING'] = 'utf-8'
     process = subprocess.Popen(
-        command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, cwd=str(cwd), env=os.environ.copy()
+        command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, cwd=str(cwd), env=env, encoding='utf-8'
     )
 
     output = []
@@ -122,7 +124,7 @@ def build_command(
 ) -> list[str]:
     python_path = "../../../codeflash/main.py" if "code_directories" in str(cwd) else "../codeflash/main.py"
 
-    base_command = ["python", python_path, "--file", config.file_path, "--no-pr"]
+    base_command = ["uv", "run", "--no-project", python_path, "--file", config.file_path, "--no-pr"]
 
     if config.function_name:
         base_command.extend(["--function", config.function_name])
@@ -187,9 +189,11 @@ def validate_stdout_in_candidate(stdout: str, expected_in_stdout: list[str]) ->
 def run_trace_test(cwd: pathlib.Path, config: TestConfig, expected_improvement_pct: int) -> bool:
     test_root = cwd / "tests" / (config.test_framework or "")
     clear_directory(test_root)
-    command = ["python", "-m", "codeflash.main", "optimize", "workload.py"]
+    command = ["uv", "run", "--no-project", "-m", "codeflash.main", "optimize", "workload.py"]
+    env = os.environ.copy()
+    env['PYTHONIOENCODING'] = 'utf-8'
     process = subprocess.Popen(
-        command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, cwd=str(cwd), env=os.environ.copy()
+        command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, cwd=str(cwd), env=env, encoding='utf-8'
     )
 
     output = []