Fix Windows task and certificate collector reliability

tests/test_powershell.py

@@ -8,6 +8,12 @@ import unittest
 class PowerShellTests(unittest.TestCase):
     def test_native_ast_and_synthetic_collectors(self):
         executable = shutil.which('powershell.exe') if os.name == 'nt' else shutil.which('pwsh')
+        self.run_collectors(executable)
+
+    def test_powershell_7_collectors(self):
+        self.run_collectors(shutil.which('pwsh'))
+
+    def run_collectors(self, executable):
         if not executable:
             self.skipTest('No PowerShell runtime available; native AST/collector tests require Windows PowerShell 5.1 or pwsh.')
         script=Path('tests/powershell/Test-Collectors.ps1').resolve()