Yet more tests, a couple edge cases and a test of the set-ip commands.

testsuite/tests/frontend/set-ip/info

+Sets up a basic topology and then tries out all the tb-set-ip commands.
+

testsuite/tests/frontend/set-ip/nsfile.ns

+source tb_compat.tcl
+
+set ns [new Simulator]
+
+set node0 [$ns node]
+set node1 [$ns node]
+set node2 [$ns node]
+
+set lan0 [$ns make-lan "$node0 $node1 $node2" 100Mb 0ms]
+
+set node3 [$ns node]
+
+set link0 [$ns duplex-link $node0 $node3 100Mb 0ms DropTail]
+
+set node4 [$ns node]
+
+$ns duplex-link $node4 $node0 100Mb 0ms DropTail
+
+tb-set-ip $node4 1.0.4.1
+tb-set-ip-interface $node0 $node4 1.0.0.1
+tb-set-ip-link $node0 $link0 1.0.0.2
+tb-set-ip-lan $node0 $lan0 1.0.0.3
+
+$ns run
+

testsuite/tests/frontend/set-ip/test

+tb_prerun("tbprerun",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbend",0);

testsuite/tests/frontend/singlenode/info

+One node.

testsuite/tests/frontend/singlenode/nsfile.ns

+set ns [new Simulator]
+set node [$ns node]
+$ns run
+

testsuite/tests/frontend/singlenode/test

+tb_prerun("tbprerun",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbend",0);

testsuite/tests/frontend/trivial/info

+Trivial test.  Creates a simulator and runs it.  No nodes, no lans, 
+nothing.

testsuite/tests/frontend/trivial/nsfile.ns

+set ns [new Simulator]
+$ns run
+

testsuite/tests/frontend/trivial/test

+tb_prerun("tbprerun",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbswapin",0);
+tb_run("tbswapout",0);
+tb_run("tbend",0);