Python: Copy Python extractor to codeql repo

python/extractor/tests/buildtools/test_install.py

@@ -0,0 +1,16 @@
+import pytest
+
+import buildtools.install
+from tests.buildtools.helper import in_fresh_temp_dir
+
+def test_basic(monkeypatch, mocker):
+    mocker.patch('subprocess.call')
+    mocker.patch('subprocess.check_call')
+
+    with in_fresh_temp_dir() as path:
+        monkeypatch.setenv('LGTM_WORKSPACE', path)
+        monkeypatch.setenv('SEMMLE_DIST', '<none>')
+
+        with pytest.raises(SystemExit) as exc_info:
+            buildtools.install.main(3, '.', [])
+        assert exc_info.value.code == 0