tests/test-client: Add helper to run 'script'

The script is a list of newline separated command lines that are sent to
the client one by one as if one would have used e.g.
meta_test_client_do().

It doesn't have error handling as it's expected to be used from tests,
and handling errors in tests that never expects to handle errors is
cumbersome.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2810>

src/tests/meta-test-utils.c

@@ -353,6 +353,29 @@ meta_test_client_do (MetaTestClient  *client,
   return retval;
 }
 
+void
+meta_test_client_run (MetaTestClient *client,
+                      const char     *script)
+{
+  g_auto (GStrv) lines = NULL;
+  int i;
+
+  lines = g_strsplit (script, "\n", -1);
+  for (i = 0; lines[i]; i++)
+    {
+      g_autoptr (GError) error = NULL;
+
+      if (strlen (lines[i]) > 1)
+        {
+          g_autofree char *line = NULL;
+
+          line = g_strdup_printf ("%s\n", lines[i]);
+          if (!meta_test_client_do_line (client, line, &error))
+            g_error ("Failed to do line '%s': %s", lines[i], error->message);
+        }
+    }
+}
+
 gboolean
 meta_test_client_wait (MetaTestClient  *client,
                        GError         **error)

src/tests/meta-test-utils.h

@@ -74,6 +74,10 @@ gboolean meta_test_client_dov (MetaTestClient  *client,
                                GError         **error,
                                va_list          vap);
 
+META_EXPORT
+void meta_test_client_run (MetaTestClient *client,
+                           const char     *script);
+
 META_EXPORT
 gboolean meta_test_client_do (MetaTestClient  *client,
                               GError         **error,