tests: ensure we're run via tox

Otherwise, setup functions that set git config variables like
user.name are potentially dangerous to run.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>

tests/test_config.py

@@ -13,6 +13,8 @@ from west import configuration as config
 
 from conftest import cmd
 
+assert 'TOXTEMPDIR' in os.environ, "you must run these tests using tox"
+
 SYSTEM = config.ConfigFile.SYSTEM
 GLOBAL = config.ConfigFile.GLOBAL
 LOCAL = config.ConfigFile.LOCAL

tests/test_help.py

@@ -8,6 +8,8 @@ import sys
 from west.app.main import BUILTIN_COMMAND_GROUPS
 from conftest import cmd
 
+assert 'TOXTEMPDIR' in os.environ, "you must run these tests using tox"
+
 def test_builtin_help_and_dash_h(west_init_tmpdir):
     # Test "west help" and "west -h" are the same for built-in
     # functionality.

tests/test_main.py

@@ -1,8 +1,11 @@
+import os
 import subprocess
 import sys
 
 import west.version
 
+assert 'TOXTEMPDIR' in os.environ, "you must run these tests using tox"
+
 def test_main():
     # A quick check that the package can be executed as a module which
     # takes arguments, using e.g. "python3 -m west --version" to

tests/test_manifest.py

@@ -28,6 +28,8 @@ from west.manifest import Manifest, Project, ManifestProject, \
 from conftest import create_workspace, create_repo, checkout_branch, \
     create_branch, add_commit, rev_parse, GIT, check_proj_consistency
 
+assert 'TOXTEMPDIR' in os.environ, "you must run these tests using tox"
+
 FPI = ImportFlag.FORCE_PROJECTS  # to force project imports to use the callback
 
 if platform.system() == 'Windows':

tests/test_project.py

@@ -18,6 +18,8 @@ from west.manifest import ImportFlag as MIF
 from conftest import create_workspace, create_repo, add_commit, add_tag, \
     check_output, cmd, GIT, rev_parse, check_proj_consistency
 
+assert 'TOXTEMPDIR' in os.environ, "you must run these tests using tox"
+
 #
 # Helpers
 #