[tests] Add basic script to _allowed_failures of TestScriptGenerator

This script is mostly failing when running on wikisource:zh.
Also set experimental on wikipedia:test tests and remove it
for beta wikis.

Change-Id: Ic1f480f38b543573ffb861159cb47cab709b39a7
---
M tests/script_tests.py
M .github/workflows/pywikibot-ci.yml
2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/pywikibot-ci.yml b/.github/workflows/pywikibot-ci.yml
index 083e083..093e0e1 100644
--- a/.github/workflows/pywikibot-ci.yml
+++ b/.github/workflows/pywikibot-ci.yml
@@ -35,20 +35,18 @@
             site: False
             family: wpbeta
             code: en
-            experimental: true
             os: ubuntu-20.04
           - python-version: 3.6
             site: False
             family: wpbeta
             code: zh
-            experimental: true
             os: ubuntu-20.04
           - python-version: 3.8
             site: wsbeta:en
-            experimental: true
           - python-version: 3.7
             site: wikipedia:test
             write-test: true
+            experimental: true
           - python-version: 3.7
             site: wikidata:test
           - python-version: 3.9
diff --git a/tests/script_tests.py b/tests/script_tests.py
index 70db1d7..8f85bed 100755
--- a/tests/script_tests.py
+++ b/tests/script_tests.py
@@ -440,7 +440,9 @@
         'welcome',
     }
 
-    _allowed_failures = set()
+    _allowed_failures = {
+        'basic',
+    }
     _arguments = '-simulate -page:Foobar -always -site:wikipedia:en'
     _results = ("Working on 'Foobar'", 'Script terminated successfully')
     _skip_results = {}

