[PATCH 1/3] diff-highlight: add some tests.

[Brian Henderson <henderson.bj@gmail.com>]

---
 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