Fix typo: stdin -> stderr

tests/test_install.py

@@ -67,7 +67,7 @@ def test_install_environment_zlib(create_mock_git_repository):
     #     subprocess.run(
     #         "cp -r foss2021a-mpi fuss1999a",
     #         shell=True,
-    #         stdin=subprocess.PIPE,
+    #         stderr=subprocess.PIPE,
     #         stdout=subprocess.PIPE,
     #     )
     # add zlib as a spec to global_generic
@@ -93,7 +93,7 @@ def test_install_environment_zlib(create_mock_git_repository):
         subprocess.run(
             ["gcc -dumpfullversion"],
             shell=True,
-            stdin=subprocess.PIPE,
+            stderr=subprocess.PIPE,
             stdout=subprocess.PIPE,
         )
         .stdout.decode("utf-8")

tests/test_prepare.py

@@ -45,7 +45,7 @@ def test_prepare_environment(tmp_path, create_mock_git_repository):
     git_branch_output_raw = subprocess.run(
         f"cd {str(folders.repo_path)} && git branch",
         shell=True,
-        stdin=subprocess.PIPE,
+        stderr=subprocess.PIPE,
         stdout=subprocess.PIPE,
     )
     git_branch_stdout = git_branch_output_raw.stdout.decode("utf-8")