[PATCH-v2/RFC 6/6] t4015: add tests for trailing-space on incomplete line

[Thell Fowler <git@tbfowler.name>]

  - Add 7 --no-index tests to t4015-diff-whitespace.sh to check
    that ignore options work on incomplete lines.

Signed-off-by: Thell Fowler <git@tbfowler.name>
---
 t/t4015-diff-whitespace.sh |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 6d13da3..193ddbe 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -395,4 +395,37 @@ test_expect_success 'combined diff with autocrlf conversion' '
 
 '
 
+# Ignore trailing-space testing on incomplete lines.
+prepare_diff_file () {
+	printf "%s%$2s" foo "" >"$1"
+	if [ $3 = "+nl" ]
+	then
+		printf "\n" >>"$1"
+	fi
+}
+
+diff_trailing () {
+	foo="foo___"
+	prepare_diff_file "left" "$2" "$3"
+	lfoo=$( expr substr $foo 1 $((3+$2)) )
+	lfoo=${lfoo}"$3"
+
+	prepare_diff_file "right" "$4" "$5"
+	rfoo=$( expr substr $foo 1 $((3+$4)) )
+	rfoo=${rfoo}"$5"
+
+	label="-$1 $lfoo $rfoo"
+
+	test_expect_success "$label" \
+	"! git diff --no-index -$1 -- left right | grep -q foo"
+}
+
+diff_trailing w 0 +nl 1 -nl
+diff_trailing w 0 -nl 1 -nl
+diff_trailing b 0 +nl 0 -nl
+diff_trailing b 1 +nl 0 -nl
+diff_trailing b 1 -nl 0 -nl
+diff_trailing -ignore-space-at-eol 0 +nl 0 -nl
+diff_trailing -ignore-space-at-eol 2 +nl 2 -nl
+
 test_done
-- 
1.6.4.176.g556a4