convert: Test svn sink for a repo with tags.

This test case backs the fix in changeset 7e5f5e5858f9.  The subversion
sink used to crash, if the source repo used tags.

tests/test-convert-svn-sink

@@ -134,3 +134,15 b" hg --cwd b ci -d '5 0' -m 'merge'"
 hg convert -d svn b
 echo % expect 4 changes
 svnupanddisplay b-hg-wc 0
+
+echo % tags are not supported, but must not break conversion
+
+rm -rf a a-hg a-hg-wc
+hg init a
+echo a > a/a
+hg --cwd a ci -d '0 0' -A -m 'Add file a'
+hg --cwd a tag -d '1 0' -m 'Tagged as v1.0' v1.0
+
+hg convert -d svn a
+svnupanddisplay a-hg-wc 2
+rm -rf a a-hg a-hg-wc

tests/test-convert-svn-sink.out

@@ -335,3 +335,41 b' At revision 4.'
 <msg>base</msg>
 </logentry>
 </log>
+% tags are not supported, but must not break conversion
+adding a
+assuming destination a-hg
+initializing svn repository 'a-hg'
+initializing svn working copy 'a-hg-wc'
+scanning source...
+sorting...
+converting...
+1 Add file a
+0 Tagged as v1.0
+writing Subversion tags is not yet implemented
+At revision 2.
+ 2 2 test .
+ 2 1 test a
+ 2 2 test .hgtags
+<?xml version="1.0"?>
+<log>
+<logentry
+   revision="2">
+<author>test</author>
+<date/>
+<paths>
+<path
+   action="A">/.hgtags</path>
+</paths>
+<msg>Tagged as v1.0</msg>
+</logentry>
+<logentry
+   revision="1">
+<author>test</author>
+<date/>
+<paths>
+<path
+   action="A">/a</path>
+</paths>
+<msg>Add file a</msg>
+</logentry>
+</log>