t7800-difftool: Set a bogus tool for use by tests

If a difftool test has an error then running the git test suite
may end up invoking a GUI diff tool.  We now guard against this
by setting a difftool.bogus-tool.cmd variable.

The tests already used --tool=bogus-tool in various places so
this is simply ensuring that nothing ever falls back and
finds a real diff tool.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index fff6a6d0eab4b27d5bc7ff4636913cb10296ab7b..707a0f54ae85a6095c57e2598bb5cd3fd83bceb3 100755 (executable)
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -36,6 +36,7 @@ restore_test_defaults()
        unset GIT_DIFFTOOL_NO_PROMPT
        git config diff.tool test-tool &&
        git config difftool.test-tool.cmd 'cat $LOCAL'
+       git config difftool.bogus-tool.cmd false
 }
 
 prompt_given()
@@ -71,7 +72,7 @@ test_expect_success 'custom commands' '
 
 # Ensures that git-difftool ignores bogus --tool values
 test_expect_success 'difftool ignores bad --tool values' '
-       diff=$(git difftool --no-prompt --tool=bogus-tool branch)
+       diff=$(git difftool --no-prompt --tool=bad-tool branch)
        test "$?" = 1 &&
        test "$diff" = ""
 '