[PATCH 2 of 2 evolve-ext v2] evolve: adding test case for calling split without -r argument

[Kostia Balytskyi]

# HG changeset patch
# User Kostia Balytskyi <ikostia at fb.com>
# Date 1454322132 28800
#      Mon Feb 01 02:22:12 2016 -0800
# Node ID e56278f5ad8a074c888cc734a137120b17219241
# Parent  8cf256f9050bca9c6ff190bf732e9ce687818d5f
evolve: adding test case for calling split without -r argument

Currently, if one runs `hg split .` or `hg split`, it will fail
with an exception. This happens becuase we only expect revision
args to be passed as --rev/-r ones and don't treat unnamed args
properly or add default values if no args are provided.
This test covets the described case.

diff --git a/tests/test-split.t b/tests/test-split.t
--- a/tests/test-split.t
+++ b/tests/test-split.t
@@ -335,4 +335,34 @@
   abort: cannot split commit: ced8fbcce3a7 not a head
   [255]
 
+Changing evolution level to createmarkers
+  $ echo "[experimental]" >> $HGRCPATH
+  $ echo "evolution=createmarkers" >> $HGRCPATH
 
+Running split without any revision operates on the parent of the working copy
+  $ hg split << EOF
+  > q
+  > EOF
+  (leaving bookmark bookB)
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  adding _d
+  diff --git a/_d b/_d
+  new file mode 100644
+  examine changes to '_d'? [Ynesfdaq?] q
+  
+  abort: user quit
+  [255]
+
+Running split with tip revision, specified as unnamed argument
+  $ hg split . << EOF
+  > q
+  > EOF
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  adding _d
+  diff --git a/_d b/_d
+  new file mode 100644
+  examine changes to '_d'? [Ynesfdaq?] q
+  
+  abort: user quit
+  [255]
+