tests: fix bashism to load helpers.sh

`source` isn't available at POSIX sh.

tests/test-bookmarks-rebase

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "rebase=" >> $HGRCPATH

tests/test-bookmarks-strip

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 echo "[extensions]" >> $HGRCPATH
 echo "bookmarks=" >> $HGRCPATH
 echo "mq=" >> $HGRCPATH

tests/test-mq

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 checkundo()
 {

tests/test-mq-strip

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "mq=" >> $HGRCPATH

tests/test-rebase-abort

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-cache

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 createrepo() {
     rm -rf repo

tests/test-rebase-check-restore

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-collapse

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-conflicts

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-detach

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-interruptions

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH
 echo "rebase=" >> $HGRCPATH

tests/test-rebase-issue-noparam-single-rev

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-mq

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-mq-skip

@@ -2,7 +2,7 b''
 # This emulates the effects of an hg pull --rebase in which the remote repo 
 # already has one local mq patch
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-newancestor

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-parameters

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "rebase=" >> $HGRCPATH

tests/test-rebase-pull

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-rebase-rename

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "rebase=" >> $HGRCPATH

tests/test-rebase-scenario-global

@@ -1,6 +1,6 b''
 #!/bin/sh
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 
 echo "[extensions]" >> $HGRCPATH
 echo "graphlog=" >> $HGRCPATH

tests/test-strip-cross

@@ -2,7 +2,7 b''
 
 # test stripping of filelogs where the linkrev doesn't always increase
 
-source $TESTDIR/helpers.sh
+. $TESTDIR/helpers.sh
 echo '[extensions]' >> $HGRCPATH
 echo 'hgext.mq =' >> $HGRCPATH