[PATCH v4 2/6] t5541-http-push.sh: add test for unmatched, non-fast-forwarded refs

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Some refs can only be matched to a remote ref with an explicit refspec.
When such a ref is a non-fast-forward of its remote ref,  test that
pushing them (with the explicit refspec specified) fails with a non-
fast-foward-type error (viz. printing of ref status and help message).

Signed-off-by: Tay Ray Chuan <rctay89@xxxxxxxxx>
---

Changed from v3:
 - Reworded commit message
 - Reword the comments
 - Used '*' instead of '\+' for grep expressions
 - Used [a-f0-9] instead of [a-z0-9] for matching hexadecimals
 - Used ' ' instead of '[ ]' for matching SP

 t/t5541-http-push.sh |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/t/t5541-http-push.sh b/t/t5541-http-push.sh
index f49c7c4..cc740fe 100755
--- a/t/t5541-http-push.sh
+++ b/t/t5541-http-push.sh
@@ -111,5 +111,26 @@ Merge the remote changes before pushing again.  See the '"'non-fast-forward'"'
 section of '"'git push --help'"' for details." output
 '

+test_expect_failure 'push fails for non-fast-forward refs unmatched by remote helper' '
+	# create a dissimilarly-named remote ref so that git is unable to match the
+	# two refs (viz. local, remote) unless an explicit refspec is provided.
+	git push origin master:retsam
+
+	echo "change changed" > path2 &&
+	git commit -a -m path2 --amend &&
+
+	# push master too; this ensures there is at least one '"'push'"' command to
+	# the remote helper and triggers interaction with the helper.
+	!(git push -v origin +master master:retsam >output 2>&1) &&
+
+	grep "^ + [a-f0-9]*\.\.\.[a-f0-9]* *master -> master (forced update)$" output &&
+	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output &&
+
+	grep \
+"To prevent you from losing history, non-fast-forward updates were rejected
+Merge the remote changes before pushing again.  See the '"'non-fast-forward'"'
+section of '"'git push --help'"' for details." output
+'
+
 stop_httpd
 test_done
--
1.6.6.341.ga7aec

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