nixos/test-driver: Add new waitForText function.

As promised in the previous commit, this can be used similarly to
$machine->waitForWindow, where you supply a regular expression and it's
retrying OCR until the regexp matches.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/nixos/lib/test-driver/Machine.pm b/nixos/lib/test-driver/Machine.pm
index 0dddc1dc14b..d149634e9e6 100644
--- a/nixos/lib/test-driver/Machine.pm
+++ b/nixos/lib/test-driver/Machine.pm
@@ -518,6 +518,17 @@ sub getScreenText {
 }
 
 
+# Wait until a specific regexp matches the textual contents of the screen.
+sub waitForText {
+    my ($self, $regexp) = @_;
+    $self->nest("waiting for $regexp to appear on the screen", sub {
+        retry sub {
+            return 1 if $self->getScreenText =~ /$regexp/;
+        }
+    });
+}
+
+
 # Wait until it is possible to connect to the X server.  Note that
 # testing the existence of /tmp/.X11-unix/X0 is insufficient.
 sub waitForX {