Apply suggestions from code review

Co-authored-by: Jean-Christophe Morin <38703886+JeanChristopheMorinPerso@users.noreply.github.com>
Signed-off-by: Nate Cheung <nathan.cheung.451@outlook.com>

src/rez/tests/test_context.py

@@ -74,6 +74,8 @@ def test_execute_command(self):
     def test_resolved_packages_testing_environ(self):
         """Test resolving packages within a testing environment behaves correctly"""
         packages_path = self.data_path("builds", "packages")
+
+        # Note how we use testing=True
         r = ResolvedContext(["testing_obj"], testing=True, package_paths=[packages_path])
         resolvedPackages = [x.qualified_package_name for x in r.resolved_packages]
         self.assertEqual(resolvedPackages, ["floob", "testing_obj-1.0.0"])
@@ -82,20 +84,8 @@ def test_execute_command_testing_environ(self):
         """Test that execute_command properly sets test specific environ dict"""
         self.inject_python_repo()
         packages_path = self.data_path("builds", "packages")
-        r = ResolvedContext(["testing_obj", "python"], testing=True, package_paths=[packages_path])
-        self._test_execute_command_test_environ(r)
-
-    def _test_execute_command_test_environ(self, r):
-        pycode = ("import os; "
-                  "print(os.getenv(\"CAR_IDEA\"));")
-
-        args = ["python", "-c", pycode]
-
-        p = r.execute_command(args, stdout=subprocess.PIPE)
-        stdout, _ = p.communicate()
-        stdout = stdout.strip()
-        parts = [x.strip() for x in stdout.decode("utf-8").split('\n')]
-        self.assertEqual(parts, ["STURDY STEERING WHEEL"])
+        r = ResolvedContext(["testing_obj", "python"], testing=True, package_paths=[packages_path] + self.settings["packages_path"])
+        self.assertEqual(r.get_environ().get("CAR_IDEA"), "STURDY STEERING WHEEL")
 
     def test_execute_command_environ(self):
         """Test that execute_command properly sets environ dict."""