---
contrib/diff-highlight/Makefile | 5 ++
contrib/diff-highlight/t/Makefile | 19 +++++++
contrib/diff-highlight/t/t9400-diff-highlight.sh | 63 ++++++++++++++++++++++
contrib/diff-highlight/t/test-diff-highlight.sh | 69 ++++++++++++++++++++++++
4 files changed, 156 insertions(+)
create mode 100644 contrib/diff-highlight/Makefile
create mode 100644 contrib/diff-highlight/t/Makefile
create mode 100644 contrib/diff-highlight/t/t9400-diff-highlight.sh
create mode 100644 contrib/diff-highlight/t/test-diff-highlight.sh
diff --git a/contrib/diff-highlight/Makefile b/contrib/diff-highlight/Makefile
new file mode 100644
index 0000000..b866259
--- /dev/null
+++ b/contrib/diff-highlight/Makefile
@@ -0,0 +1,5 @@
+# nothing to build
+all:;
+
+test:
+ $(MAKE) -C t
diff --git a/contrib/diff-highlight/t/Makefile
b/contrib/diff-highlight/t/Makefile
new file mode 100644
index 0000000..ac81fc0
--- /dev/null
+++ b/contrib/diff-highlight/t/Makefile
@@ -0,0 +1,19 @@
+-include ../../../config.mak.autogen
+-include ../../../config.mak
+
+T = $(wildcard t[0-9][0-9][0-9][0-9]-*.sh)
+
+all: test
+test: $(T)
+
+.PHONY: help clean all test $(T)
+
+help:
+ @echo 'Run "$(MAKE) test" to launch test scripts'
+ @echo 'Run "$(MAKE) clean" to remove trash folders'
+
+$(T):
+ @echo "*** $@ ***"; sh $@ $(GIT_TEST_OPTS)
+
+clean:
+ $(RM) -r 'trash directory'.*
diff --git a/contrib/diff-highlight/t/t9400-diff-highlight.sh
b/contrib/diff-highlight/t/t9400-diff-highlight.sh
new file mode 100644
index 0000000..ca7605f
--- /dev/null
+++ b/contrib/diff-highlight/t/t9400-diff-highlight.sh
@@ -0,0 +1,63 @@
+#!/bin/sh
+#
+# Copyright (C) 2016
+
+test_description='Test diff-highlight'
+
+. ./test-diff-highlight.sh
+. $TEST_DIRECTORY/test-lib.sh
+
+# PERL is required, but assumed to be present, although not necessarily modern
+# some tests require 5.8
+
+test_expect_success 'diff-highlight highlightes the beginning of a line' '
+ dh_test \
+ "aaa\nbbb\nccc\n" \
+ "aaa\n0bb\nccc\n" \
+"
+ aaa
+-${CW}b${CR}bb
++${CW}0${CR}bb
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight highlightes the end of a line' '
+ dh_test \
+ "aaa\nbbb\nccc\n" \
+ "aaa\nbb0\nccc\n" \
+"
+ aaa
+-bb${CW}b${CR}
++bb${CW}0${CR}
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight highlightes the middle of a line' '
+ dh_test \
+ "aaa\nbbb\nccc\n" \
+ "aaa\nb0b\nccc\n" \
+"
+ aaa
+-b${CW}b${CR}b
++b${CW}0${CR}b
+ ccc
+"
+'
+
+test_expect_success 'diff-highlight does not highlight whole line' '
+ dh_test \
+ "aaa\nbbb\nccc\n" \
+ "aaa\n000\nccc\n"
+'
+
+test_expect_success 'diff-highlight does not highlight mismatched hunk size' '
+ dh_test \
+ "aaa\nbbb\n" \
+ "aaa\nb0b\nccc\n"
+'
+
+# TODO add multi-byte test
+
+test_done
diff --git a/contrib/diff-highlight/t/test-diff-highlight.sh
b/contrib/diff-highlight/t/test-diff-highlight.sh
new file mode 100644
index 0000000..9b26271
--- /dev/null
+++ b/contrib/diff-highlight/t/test-diff-highlight.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+#
+# Copyright (C) 2016
+
+CURR_DIR=$(pwd)
+TEST_OUTPUT_DIRECTORY=$(pwd)
+TEST_DIRECTORY="$CURR_DIR"/../../../t
+cmd=diff-highlight
+CMD="$CURR_DIR"/../$cmd
+
+CW="\033[7m"
+CR="\033[27m"
+
+export TEST_OUTPUT_DIRECTORY TEST_DIRECTORY CW CR
+
+dh_test() {
+ dh_diff_test "$@"
+ dh_commit_test "$@"
+}
+
+dh_diff_test() {
+ local a="$1" b="$2"
+
+ printf "$a" > file
+ git add file
+
+ printf "$b" > file
+
+ git diff file > diff.raw
+
+ if test "$#" = 3
+ then
+ # remove last newline
+ head -n5 diff.raw | head -c -1 > diff.act
+ printf "$3" >> diff.act
+ else
+ cat diff.raw > diff.act
+ fi
+
+ < diff.raw $CMD > diff.exp
+
+ diff diff.exp diff.act
+}
+
+dh_commit_test() {
+ local a="$1" b="$2"
+
+ printf "$a" > file
+ git add file
+ git commit -m"Add a file" >/dev/null
+
+ printf "$b" > file
+ git commit -am"Update a file" >/dev/null
+
+ git show > commit.raw
+
+ if test "$#" = 3
+ then
+ # remove last newline
+ head -n11 commit.raw | head -c -1 > commit.act
+ printf "$3" >> commit.act
+ else
+ cat commit.raw > commit.act
+ fi
+
+ < commit.raw $CMD > commit.exp
+
+ diff commit.exp commit.act
+}
--
2.9.0
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