Update tests

tests/ping_frappe_connections.py

@@ -0,0 +1,26 @@
+import frappe
+
+
+def check_db():
+    doc = frappe.get_single("System Settings")
+    assert any(v is None for v in doc.as_dict().values()), "Database test didn't pass"
+    print("Database works!")
+
+
+def check_cache():
+    key_and_name = "mytestkey", "mytestname"
+    frappe.cache().hset(*key_and_name, "mytestvalue")
+    assert frappe.cache().hget(*key_and_name) == "mytestvalue", "Cache test didn't pass"
+    frappe.cache().hdel(*key_and_name)
+    print("Cache works!")
+
+
+def main() -> int:
+    frappe.connect(site="tests")
+    check_db()
+    check_cache()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())