smartlog: add a test about revset

Summary:
Add a simple test about smartset revset. It shows "smartlog(master=revset)"
does not work.

Reviewed By: DurhamG

Differential Revision: D14436005

fbshipit-source-id: e566aa35d1cb335718a48db1314454d2dc50411b

tests/test-fb-hgext-smartlog-revset.t

@@ -0,0 +1,22 @@
+  $ newrepo
+  $ enable smartlog
+  $ drawdag << 'EOS'
+  > B C  # B has date 100000 0
+  > |/   # C has date 200000 0
+  > A
+  > EOS
+  $ hg bookmark -ir $A master
+  $ hg log -r 'smartlog()' -T '{desc}\n'
+  A
+  B
+  C
+  $ hg log -r "smartlog($B)" -T '{desc}\n'
+  A
+  B
+  $ hg log -r "smartlog(heads=$C, master=$B)" -T '{desc}\n'
+  A
+  B
+  C
+  $ hg log -r "smartlog(master=($A::)-$B-$C)" -T '{desc}\n'
+  hg: parse error: master must be a string
+  [255]