alloc/test: Add test for successive allocation

This test allocates as many as possible UL/DL TBF pairs, shows their
PDCH usage, and checks how many of them has been created
successfully.

Sponsored-by: On-Waves ehf
diff --git a/tests/alloc/AllocTest.err b/tests/alloc/AllocTest.err
index 3f285a4..23eea09 100644
--- a/tests/alloc/AllocTest.err
+++ b/tests/alloc/AllocTest.err
@@ -1,2 +1,17 @@
 No TFI available.
 - Failed allocating TS=2, no USF available
+- Failed allocating TS=3, no USF available
+No suitable uplink slots available
+No suitable uplink slots available
+No suitable uplink slots available
+No suitable uplink slots available
+- Failed allocating TS=3, no USF available
+No suitable uplink slots available
+No TFI available.
+No TFI available.
+- Failed allocating TS=3, no USF available
+No suitable uplink slots available
+- Failed allocating TS=3, no USF available
+No suitable uplink slots available
+No TFI available.
+No TFI available.