Tools: Make idf.py tests independent on extra extensions

tools/test_idf_py/test_idf_py.py

@@ -15,9 +15,9 @@
 # limitations under the License.
 
 import os
-import sys
-import unittest
 import subprocess
+import sys
+from unittest import TestCase, main
 
 try:
     from StringIO import StringIO
@@ -36,7 +36,17 @@ extension_path = os.path.join(current_dir, 'test_idf_extensions', 'test_ext')
 link_path = os.path.join(current_dir, '..', 'idf_py_actions', 'test_ext')
 
 
-class TestExtensions(unittest.TestCase):
+class TestWithoutExtensions(TestCase):
+    def setUp(self):
+        self.initial_env = dict(os.environ)
+        os.environ['IDF_COMPONENT_MANAGER'] = '0'
+        os.environ['IDF_EXTRA_ACTIONS_PATH'] = ''
+
+    def tearDown(self):
+        os.environ = self.initial_env
+
+
+class TestExtensions(TestWithoutExtensions):
     def test_extension_loading(self):
         try:
             os.symlink(extension_path, link_path)
@@ -78,7 +88,7 @@ class TestExtensions(unittest.TestCase):
             os.remove(link_path)
 
 
-class TestDependencyManagement(unittest.TestCase):
+class TestDependencyManagement(TestWithoutExtensions):
     def test_dependencies(self):
         result = idf.init_cli()(
             args=['--dry-run', 'flash'],
@@ -129,7 +139,7 @@ class TestDependencyManagement(unittest.TestCase):
             'WARNING: Command "clean" is found in the list of commands more than once.', capturedOutput.getvalue())
 
 
-class TestVerboseFlag(unittest.TestCase):
+class TestVerboseFlag(TestWithoutExtensions):
     def test_verbose_messages(self):
         output = subprocess.check_output(
             [
@@ -155,7 +165,7 @@ class TestVerboseFlag(unittest.TestCase):
         self.assertNotIn('Verbose mode on', output)
 
 
-class TestGlobalAndSubcommandParameters(unittest.TestCase):
+class TestGlobalAndSubcommandParameters(TestWithoutExtensions):
     def test_set_twice_same_value(self):
         """Can set -D twice: globally and for subcommand if values are the same"""
 
@@ -174,7 +184,7 @@ class TestGlobalAndSubcommandParameters(unittest.TestCase):
             )
 
 
-class TestDeprecations(unittest.TestCase):
+class TestDeprecations(TestWithoutExtensions):
     def test_exit_with_error_for_subcommand(self):
         try:
             subprocess.check_output([sys.executable, idf_py_path, "-C%s" % current_dir, "test-2"], env=os.environ)
@@ -222,4 +232,4 @@ class TestDeprecations(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    main()