test: end printed diff "hunks" with an empty string in test-context.py

So that the resulting diff is correct and does not include a spurious empty
line between lines "diff --git a/foo b/foo" and "--- a/foo".

tests/test-context.py

@@ -1,148 +1,148 b''
 from __future__ import absolute_import, print_function
 import os
 from mercurial import (
     context,
     encoding,
     hg,
     ui as uimod,
 )
 
 u = uimod.ui.load()
 
 repo = hg.repository(u, 'test1', create=1)
 os.chdir('test1')
 
 # create 'foo' with fixed time stamp
 f = open('foo', 'wb')
 f.write(b'foo\n')
 f.close()
 os.utime('foo', (1000, 1000))
 
 # add+commit 'foo'
 repo[None].add(['foo'])
 repo.commit(text='commit1', date="0 0")
 
 if os.name == 'nt':
     d = repo[None]['foo'].date()
     print("workingfilectx.date = (%d, %d)" % (d[0], d[1]))
 else:
     print("workingfilectx.date =", repo[None]['foo'].date())
 
 # test memctx with non-ASCII commit message
 
 def filectxfn(repo, memctx, path):
     return context.memfilectx(repo, "foo", "")
 
 ctx = context.memctx(repo, ['tip', None],
                      encoding.tolocal("Gr\xc3\xbcezi!"),
                      ["foo"], filectxfn)
 ctx.commit()
 for enc in "ASCII", "Latin-1", "UTF-8":
     encoding.encoding = enc
     print("%-8s: %s" % (enc, repo["tip"].description()))
 
 # test performing a status
 
 def getfilectx(repo, memctx, f):
     fctx = memctx.parents()[0][f]
     data, flags = fctx.data(), fctx.flags()
     if f == 'foo':
         data += 'bar\n'
     return context.memfilectx(repo, f, data, 'l' in flags, 'x' in flags)
 
 ctxa = repo.changectx(0)
 ctxb = context.memctx(repo, [ctxa.node(), None], "test diff", ["foo"],
                       getfilectx, ctxa.user(), ctxa.date())
 
 print(ctxb.status(ctxa))
 
 # test performing a diff on a memctx
 
 for d in ctxb.diff(ctxa, git=True):
-    print(d)
+    print(d, end='')
 
 # test safeness and correctness of "ctx.status()"
 print('= checking context.status():')
 
 # ancestor "wcctx ~ 2"
 actx2 = repo['.']
 
 repo.wwrite('bar-m', 'bar-m\n', '')
 repo.wwrite('bar-r', 'bar-r\n', '')
 repo[None].add(['bar-m', 'bar-r'])
 repo.commit(text='add bar-m, bar-r', date="0 0")
 
 # ancestor "wcctx ~ 1"
 actx1 = repo['.']
 
 repo.wwrite('bar-m', 'bar-m bar-m\n', '')
 repo.wwrite('bar-a', 'bar-a\n', '')
 repo[None].add(['bar-a'])
 repo[None].forget(['bar-r'])
 
 # status at this point:
 #   M bar-m
 #   A bar-a
 #   R bar-r
 #   C foo
 
 from mercurial import scmutil
 
 print('== checking workingctx.status:')
 
 wctx = repo[None]
 print('wctx._status=%s' % (str(wctx._status)))
 
 print('=== with "pattern match":')
 print(actx1.status(other=wctx,
                    match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
 print('wctx._status=%s' % (str(wctx._status)))
 print(actx2.status(other=wctx,
                    match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
 print('wctx._status=%s' % (str(wctx._status)))
 
 print('=== with "always match" and "listclean=True":')
 print(actx1.status(other=wctx, listclean=True))
 print('wctx._status=%s' % (str(wctx._status)))
 print(actx2.status(other=wctx, listclean=True))
 print('wctx._status=%s' % (str(wctx._status)))
 
 print("== checking workingcommitctx.status:")
 
 wcctx = context.workingcommitctx(repo,
                                  scmutil.status(['bar-m'],
                                                 ['bar-a'],
                                                 [],
                                                 [], [], [], []),
                                  text='', date='0 0')
 print('wcctx._status=%s' % (str(wcctx._status)))
 
 print('=== with "always match":')
 print(actx1.status(other=wcctx))
 print('wcctx._status=%s' % (str(wcctx._status)))
 print(actx2.status(other=wcctx))
 print('wcctx._status=%s' % (str(wcctx._status)))
 
 print('=== with "always match" and "listclean=True":')
 print(actx1.status(other=wcctx, listclean=True))
 print('wcctx._status=%s' % (str(wcctx._status)))
 print(actx2.status(other=wcctx, listclean=True))
 print('wcctx._status=%s' % (str(wcctx._status)))
 
 print('=== with "pattern match":')
 print(actx1.status(other=wcctx,
                    match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
 print('wcctx._status=%s' % (str(wcctx._status)))
 print(actx2.status(other=wcctx,
                    match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
 print('wcctx._status=%s' % (str(wcctx._status)))
 
 print('=== with "pattern match" and "listclean=True":')
 print(actx1.status(other=wcctx,
                    match=scmutil.matchfiles(repo, ['bar-r', 'foo']),
                    listclean=True))
 print('wcctx._status=%s' % (str(wcctx._status)))
 print(actx2.status(other=wcctx,
                    match=scmutil.matchfiles(repo, ['bar-r', 'foo']),
                    listclean=True))
 print('wcctx._status=%s' % (str(wcctx._status)))

tests/test-context.py.out

@@ -1,48 +1,46 b''
 workingfilectx.date = (1000, 0)
 ASCII   : Gr?ezi!
 Latin-1 : Gr�ezi!
 UTF-8   : Grüezi!
 <status modified=['foo'], added=[], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 diff --git a/foo b/foo
-
 --- a/foo
 +++ b/foo
 @@ -1,1 +1,2 @@
  foo
 +bar
-
 = checking context.status():
 == checking workingctx.status:
 wctx._status=<status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "pattern match":
 <status modified=['bar-m'], added=[], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wctx._status=<status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-m'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wctx._status=<status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "always match" and "listclean=True":
 <status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=['foo']>
 wctx._status=<status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-a', 'bar-m'], removed=[], deleted=[], unknown=[], ignored=[], clean=['foo']>
 wctx._status=<status modified=['bar-m'], added=['bar-a'], removed=['bar-r'], deleted=[], unknown=[], ignored=[], clean=[]>
 == checking workingcommitctx.status:
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "always match":
 <status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-a', 'bar-m', 'bar-r'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "always match" and "listclean=True":
 <status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=['bar-r', 'foo']>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-a', 'bar-m', 'bar-r'], removed=[], deleted=[], unknown=[], ignored=[], clean=['foo']>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "pattern match":
 <status modified=['bar-m'], added=[], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-m'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 === with "pattern match" and "listclean=True":
 <status modified=[], added=[], removed=[], deleted=[], unknown=[], ignored=[], clean=['bar-r', 'foo']>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
 <status modified=[], added=['bar-r'], removed=[], deleted=[], unknown=[], ignored=[], clean=['foo']>
 wcctx._status=<status modified=['bar-m'], added=['bar-a'], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>