[PATCH v1 2/3] Test functionality of new config variable "diff.primer"

@@ -0,0 +1,111 @@
+#!/bin/sh
+#
+# Copyright (c) 2009 Keith G. Cascio
+#
+# based on t4015-diff-whitespace.sh by Johannes E. Schindelin
+#
+
+test_description='Ensure diff engine honors config variable "diff.primer".
+
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/diff-lib.sh
+
+tr 'Q' '\015' << EOF > x
+whitespace at beginning
+whitespace change
+whitespace in the middle
+whitespace at end
+unchanged line
+CR at endQ
+EOF
+
+git add x
+git commit -m '1.0' >/dev/null 2>&1
+
+tr '_' ' ' << EOF > x
+	whitespace at beginning
+whitespace 	 change
+white space in the middle
+whitespace at end__
+unchanged line
+CR at end
+EOF
+
+test_expect_success 'ensure diff.primer begins with empty value' '
+[ -z $(git config --get diff.primer) ]
+'
+
+tr 'Q_' '\015 ' << EOF > expect
+diff --git a/x b/x
+index d99af23..8b32fb5 100644
+--- a/x
++++ b/x
+@@ -1,6 +1,6 @@
+-whitespace at beginning
+-whitespace change
+-whitespace in the middle
+-whitespace at end
++	whitespace at beginning
++whitespace 	 change
++white space in the middle
++whitespace at end__
+ unchanged line
+-CR at endQ
++CR at end
+EOF
+git diff > out
+test_expect_success 'test diff with empty value of diff.primer' 'test_cmp expect out'
+
+git config diff.primer '-w'
+
+test_expect_success 'ensure diff.primer value set' '
+[ $(git config --get diff.primer) = "-w" ]
+'
+
+git diff --no-primer > out
+test_expect_success 'test git diff --no-primer' 'test_cmp expect out'
+
+cat << EOF > expect
+diff --git a/x b/x
+index d99af23..8b32fb5 100644
+EOF
+git diff > out
+test_expect_success 'test with diff.primer = -w' 'test_cmp expect out'
+
+git add x
+git commit -m 'whitespace changes' >/dev/null 2>&1
+
+git config diff.primer '-w --color'
+
+tr 'Q_' '\015 ' << EOF > expect
+Subject: [PATCH] whitespace changes
+
+---
+ x |   10 +++++-----
+ 1 files changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/x b/x
+index d99af23..8b32fb5 100644
+--- a/x
++++ b/x
+@@ -1,6 +1,6 @@
+-whitespace at beginning
+-whitespace change
+-whitespace in the middle
+-whitespace at end
++	whitespace at beginning
++whitespace 	 change
++white space in the middle
++whitespace at end__
+ unchanged line
+-CR at endQ
++CR at end
+--_
+EOF
+
+git format-patch --stdout HEAD^..HEAD 2>&1 | sed -re '1,3d;$d' | sed -re '$d' > out
+test_expect_success 'ensure git format-patch not affected by diff.primer' 'test_cmp expect out'
+
+test_done
+