Add test for blame corner cases.

Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t8003-blame.sh

@@ -0,0 +1,132 @@
+#!/bin/sh
+
+test_description='git blame corner cases'
+. ./test-lib.sh
+
+pick_fc='s/^[0-9a-f^]* *\([^ ]*\) *(\([^ ]*\) .*/\1-\2/'
+
+test_expect_success setup '
+
+	echo A A A A A >one &&
+	echo B B B B B >two &&
+	echo C C C C C >tres &&
+	echo ABC >mouse &&
+	git add one two tres mouse &&
+	test_tick &&
+	GIT_AUTHOR_NAME=Initial git commit -m Initial &&
+
+	cat one >uno &&
+	mv two dos &&
+	cat one >>tres &&
+	echo DEF >>mouse
+	git add uno dos tres mouse &&
+	test_tick &&
+	GIT_AUTHOR_NAME=Second git commit -a -m Second &&
+
+	echo GHIJK >>mouse &&
+	git add mouse &&
+	test_tick &&
+	GIT_AUTHOR_NAME=Third git commit -m Third &&
+
+	cat mouse >cow &&
+	git add cow &&
+	test_tick &&
+	GIT_AUTHOR_NAME=Fourth git commit -m Fourth &&
+
+	{
+		echo ABC
+		echo DEF
+		echo XXXX
+		echo GHIJK
+	} >cow &&
+	git add cow &&
+	test_tick &&
+	GIT_AUTHOR_NAME=Fifth git commit -m Fifth
+'
+
+test_expect_success 'straight copy without -C' '
+
+	git blame uno | grep Second
+
+'
+
+test_expect_success 'straight move without -C' '
+
+	git blame dos | grep Initial
+
+'
+
+test_expect_success 'straight copy with -C' '
+
+	git blame -C1 uno | grep Second
+
+'
+
+test_expect_success 'straight move with -C' '
+
+	git blame -C1 dos | grep Initial
+
+'
+
+test_expect_success 'straight copy with -C -C' '
+
+	git blame -C -C1 uno | grep Initial
+
+'
+
+test_expect_success 'straight move with -C -C' '
+
+	git blame -C -C1 dos | grep Initial
+
+'
+
+test_expect_success 'append without -C' '
+
+	git blame -L2 tres | grep Second
+
+'
+
+test_expect_success 'append with -C' '
+
+	git blame -L2 -C1 tres | grep Second
+
+'
+
+test_expect_success 'append with -C -C' '
+
+	git blame -L2 -C -C1 tres | grep Second
+
+'
+
+test_expect_success 'append with -C -C -C' '
+
+	git blame -L2 -C -C -C1 tres | grep Initial
+
+'
+
+test_expect_success 'blame wholesale copy' '
+
+	git blame -f -C -C1 HEAD^ -- cow | sed -e "$pick_fc" >current &&
+	{
+		echo mouse-Initial
+		echo mouse-Second
+		echo mouse-Third
+	} >expected &&
+	diff -u expected current
+
+'
+
+test_expect_success 'blame wholesale copy and more' '
+
+	git blame -f -C -C1 HEAD -- cow | sed -e "$pick_fc" >current &&
+	{
+		echo mouse-Initial
+		echo mouse-Second
+		echo cow-Fifth
+		echo mouse-Third
+	} >expected &&
+	diff -u expected current
+
+'
+
+test_done