Add test cases to support ARQ-II for EGPRS DL Retx

During MCS upgradation such as MCS6->MCS9, 2 blocks which
were sent separately as MCS6, will be clubbed into one MCS9
block during retransmission. Same holds good for
MCS5->MCS7 transistion. During MCS reduction such as
MCS9->MCS6,2 blocks which were sent together will be
sent separately during the retransmission case.
Same is verified through the generated log file. Currently
MCS8->MCS6 transition is not supported. The retransmission
MCS is being calculated from Table 8.1.1.2 of TS 44.060.
The same test cases are also integration tested on Nuran
1.0 platform.

Change-Id: Ia357acfe30f4dea95e00749916c6818354f93285
diff --git a/tests/tbf/TbfTest.ok b/tests/tbf/TbfTest.ok
index 441b444..8a7862f 100644
--- a/tests/tbf/TbfTest.ok
+++ b/tests/tbf/TbfTest.ok
@@ -43,3 +43,12 @@
 Testing MCS-8
 Testing MCS-9
 === end test_tbf_egprs_dl ===
+=== start test_tbf_egprs_retx_dl ===
+Testing retx for MCS 6 - 6
+Testing retx for MCS 1 - 9
+Testing retx for MCS 2 - 8
+Testing retx for MCS 5 - 7
+Testing retx for MCS 6 - 9
+Testing retx for MCS 7 - 5
+Testing retx for MCS 9 - 6
+=== end test_tbf_egprs_retx_dl ===