--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-update-branches.t	Tue Sep 14 12:20:51 2010 +0200
@@ -0,0 +1,130 @@
+# Construct the following history tree:
+#
+# @  5:e1bb631146ca  b1
+# |
+# o  4:a4fdb3b883c4 0:b608b9236435  b1
+# |
+# | o  3:4b57d2520816 1:44592833ba9f
+# | |
+# | | o  2:063f31070f65
+# | |/
+# | o  1:44592833ba9f
+# |/
+# o  0:b608b9236435
+
+  $ hg init
+  $ echo foo > foo
+  $ echo zero > a
+  $ hg ci -qAm0
+  $ echo one > a ; hg ci -m1
+  $ echo two > a ; hg ci -m2
+  $ hg up -q 1
+  $ echo three > a ; hg ci -qm3
+  $ hg up -q 0
+  $ hg branch -q b1
+  $ echo four > a ; hg ci -qm4
+  $ echo five > a ; hg ci -qm5
+
+Initial repo state:
+
+  $ hg --config 'extensions.graphlog=' \
+  >    glog --template '{rev}:{node|short} {parents} {branches}\n'
+  @  5:e1bb631146ca  b1
+  |
+  o  4:a4fdb3b883c4 0:b608b9236435  b1
+  |
+  | o  3:4b57d2520816 1:44592833ba9f
+  | |
+  | | o  2:063f31070f65
+  | |/
+  | o  1:44592833ba9f
+  |/
+  o  0:b608b9236435
+  
+
+Test helper functions:
+
+  $ revtest () {
+  >     msg=$1
+  >     dirtyflag=$2   # 'clean' or 'dirty'
+  >     startrev=$3
+  >     targetrev=$4
+  >     opt=$5
+  >     hg up -qC $startrev
+  >     test $dirtyflag = dirty && echo dirty > foo
+  >     hg up $opt $targetrev
+  >     hg parent --template 'parent={rev}\n'
+  >     hg stat
+  > }    
+
+  $ norevtest () {
+  >     msg=$1
+  >     dirtyflag=$2   # 'clean' or 'dirty'
+  >     startrev=$3
+  >     opt=$4
+  >     hg up -qC $startrev
+  >     test $dirtyflag = dirty && echo dirty > foo
+  >     hg up $opt
+  >     hg parent --template 'parent={rev}\n'
+  >     hg stat
+  > }    
+
+# Test cases are documented in a table in the update function of merge.py.
+# Cases are run as shown in that table, row by row.
+
+  $ norevtest 'none clean linear' clean 4
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=5
+
+  $ norevtest 'none clean same'   clean 2
+  abort: crosses branches (use 'hg merge' or use 'hg update -c')
+  parent=2
+
+
+  $ revtest 'none clean linear' clean 1 2
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=2
+
+  $ revtest 'none clean same'   clean 2 3
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=3
+
+  $ revtest 'none clean cross'  clean 3 4
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=4
+
+
+  $ revtest 'none dirty linear' dirty 1 2
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=2
+  M foo
+
+  $ revtest 'none dirty same'   dirty 2 3
+  abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes)
+  parent=2
+  M foo
+
+  $ revtest 'none dirty cross'  dirty 3 4
+  abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes)
+  parent=3
+  M foo
+
+
+  $ revtest '-C dirty linear'   dirty 1 2 -C
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=2
+
+  $ revtest '-c dirty linear'   dirty 1 2 -c
+  abort: uncommitted local changes
+  parent=1
+  M foo
+
+  $ norevtest '-c clean same'   clean 2 -c
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  parent=3
+
+  $ revtest '-cC dirty linear'  dirty 1 2 -cC
+  abort: cannot specify both -c/--check and -C/--clean
+  parent=1
+  M foo
+