thodg/got/regress/cmdline/diff.sh

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• Hash : 566e0ee7
  Author :
  Date : 2021-11-22T22:32:25
  

  regress: make test operands POSIX compliant Since the interpreter for the regress shell scripts are using /bin/sh this will usually imply some level of POSIX compliance (that isn't bash-specific, for instance). Some systems use dash as their sh shell and as such is stricter POSIX compliance. To help -portable, make the shell test checks use a single '=' for equality, rather than '=='.

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• regress/cmdline/diff.sh

• #!/bin/sh
  #
  # Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
  #
  # Permission to use, copy, modify, and distribute this software for any
  # purpose with or without fee is hereby granted, provided that the above
  # copyright notice and this permission notice appear in all copies.
  #
  # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  
  . ./common.sh
  
  test_diff_basic() {
  	local testroot=`test_init diff_basic`
  	local head_rev=`git_show_head $testroot/repo`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "modified alpha" > $testroot/wt/alpha
  	(cd $testroot/wt && got rm beta >/dev/null)
  	echo "new file" > $testroot/wt/new
  	(cd $testroot/wt && got add new >/dev/null)
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'alpha$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + alpha' >> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'beta$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + /dev/null' >> $testroot/stdout.expected
  	echo '--- beta' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-beta' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + new' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# 'got diff' in a repository without any arguments is an error
  	(cd $testroot/repo && got diff 2> $testroot/stderr)
  	echo "got: no got work tree found" > $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# 'got diff' in a repository with two arguments requires that
  	# both named objects exist
  	(cd $testroot/repo && got diff $head_rev foo 2> $testroot/stderr)
  	echo "got: foo: object not found" > $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# diff non-existent path
  	(cd $testroot/wt && got diff nonexistent > $testroot/stdout \
  		2> $testroot/stderr)
  
  	echo -n > $testroot/stdout.expected
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "got: nonexistent: No such file or directory" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "modified zeta" > $testroot/wt/epsilon/zeta
  
  	# diff several paths in a work tree
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'alpha$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + alpha' >> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'beta$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + /dev/null' >> $testroot/stdout.expected
  	echo '--- beta' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-beta' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i epsilon | grep 'zeta$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + epsilon/zeta' >> $testroot/stdout.expected
  	echo '--- epsilon/zeta' >> $testroot/stdout.expected
  	echo '+++ epsilon/zeta' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-zeta' >> $testroot/stdout.expected
  	echo '+modified zeta' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + new' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff new alpha epsilon beta > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# different order of arguments results in same output order
  	(cd $testroot/wt && got diff alpha new epsilon beta \
  		> $testroot/stdout 2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# a branch 'new' should not collide with path 'new' if more
  	# than two arguments are passed
  	got br -r $testroot/repo -c master new > /dev/null
  	(cd $testroot/wt && got diff new alpha epsilon beta \
  		> $testroot/stdout 2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# Two arguments are interpreted as objects if a colliding path exists
  	echo master > $testroot/wt/master
  	(cd $testroot/wt && got add master > /dev/null)
  	(cd $testroot/wt && got diff master new > $testroot/stdout)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "diff refs/heads/master refs/heads/new" > $testroot/stdout.expected
  	# diff between the branches is empty
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  	# same without a work tree
  	(cd $testroot/repo && got diff master new > $testroot/stdout)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "diff refs/heads/master refs/heads/new" > $testroot/stdout.expected
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  	# same with -r argument
  	got diff -r $testroot/repo master new > $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "diff refs/heads/master refs/heads/new" > $testroot/stdout.expected
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# -P can be used to force use of paths
  	(cd $testroot/wt && got diff -P new master > $testroot/stdout)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + master' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ master' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+master' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + new' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# -P can only be used in a work tree
  	got diff -r $testroot/repo -P new master 2> $testroot/stderr
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: -P option can only be used when diffing a work tree" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# a single argument which can be resolved to a path is not ambiguous
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + new' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  	(cd $testroot/wt && got diff new > $testroot/stdout)
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		echo "diff failed unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# diff with just one object ID argument results in
  	# interpretation of argument as a path
  	(cd $testroot/wt && got diff $head_rev 2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: $head_rev: No such file or directory" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# diff with more than two object arguments results in
  	# interpretation of arguments as paths
  	(cd $testroot/wt && got diff new $head_rev master \
  		> $testroot/stout 2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + new' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "got: $head_rev: No such file or directory" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		return 1
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_shows_conflict() {
  	local testroot=`test_init diff_shows_conflict 1`
  
  	echo "1" > $testroot/repo/numbers
  	echo "2" >> $testroot/repo/numbers
  	echo "3" >> $testroot/repo/numbers
  	echo "4" >> $testroot/repo/numbers
  	echo "5" >> $testroot/repo/numbers
  	echo "6" >> $testroot/repo/numbers
  	echo "7" >> $testroot/repo/numbers
  	echo "8" >> $testroot/repo/numbers
  	(cd $testroot/repo && git add numbers)
  	git_commit $testroot/repo -m "added numbers file"
  	local base_commit=`git_show_head $testroot/repo`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	sed -i 's/2/22/' $testroot/repo/numbers
  	sed -i 's/8/33/' $testroot/repo/numbers
  	git_commit $testroot/repo -m "modified line 2"
  	local head_rev=`git_show_head $testroot/repo`
  
  	# modify lines 2 and 8 in conflicting ways
  	sed -i 's/2/77/' $testroot/wt/numbers
  	sed -i 's/8/88/' $testroot/wt/numbers
  
  	echo "C  numbers" > $testroot/stdout.expected
  	echo -n "Updated to refs/heads/master: $head_rev" \
  		>> $testroot/stdout.expected
  	echo >> $testroot/stdout.expected
  	echo "Files with new merge conflicts: 1" >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got update > $testroot/stdout)
  
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'numbers$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + numbers' >> $testroot/stdout.expected
  	echo '--- numbers' >> $testroot/stdout.expected
  	echo '+++ numbers' >> $testroot/stdout.expected
  	echo '@@ -1,8 +1,20 @@' >> $testroot/stdout.expected
  	echo ' 1' >> $testroot/stdout.expected
  	echo "+<<<<<<< merged change: commit $head_rev" \
  		>> $testroot/stdout.expected
  	echo ' 22' >> $testroot/stdout.expected
  	echo "+||||||| 3-way merge base: commit $base_commit" \
  		>> $testroot/stdout.expected
  	echo '+2' >> $testroot/stdout.expected
  	echo '+=======' >> $testroot/stdout.expected
  	echo '+77' >> $testroot/stdout.expected
  	echo '+>>>>>>>' >> $testroot/stdout.expected
  	echo ' 3' >> $testroot/stdout.expected
  	echo ' 4' >> $testroot/stdout.expected
  	echo ' 5' >> $testroot/stdout.expected
  	echo ' 6' >> $testroot/stdout.expected
  	echo ' 7' >> $testroot/stdout.expected
  	echo "+<<<<<<< merged change: commit $head_rev" \
  		>> $testroot/stdout.expected
  	echo ' 33' >> $testroot/stdout.expected
  	echo "+||||||| 3-way merge base: commit $base_commit" \
  		>> $testroot/stdout.expected
  	echo '+8' >> $testroot/stdout.expected
  	echo '+=======' >> $testroot/stdout.expected
  	echo '+88' >> $testroot/stdout.expected
  	echo '+>>>>>>>' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff > $testroot/stdout)
  
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_tag() {
  	local testroot=`test_init diff_tag`
  	local commit_id0=`git_show_head $testroot/repo`
  	local tag1=1.0.0
  	local tag2=2.0.0
  
  	echo "modified alpha" > $testroot/repo/alpha
  	git_commit $testroot/repo -m "changed alpha"
  	local commit_id1=`git_show_head $testroot/repo`
  
  	(cd $testroot/repo && git tag -m "test" $tag1)
  
  	echo "new file" > $testroot/repo/new
  	(cd $testroot/repo && git add new)
  	git_commit $testroot/repo -m "new file"
  	local commit_id2=`git_show_head $testroot/repo`
  
  	(cd $testroot/repo && git tag -m "test" $tag2)
  
  	echo "diff $commit_id0 refs/tags/$tag1" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id0 -i | grep 'alpha$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'alpha$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  
  	got diff -r $testroot/repo $commit_id0 $tag1 > $testroot/stdout
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "diff refs/tags/$tag1 refs/tags/$tag2" > $testroot/stdout.expected
  	echo "blob - /dev/null" >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i -c $commit_id2 | grep 'new$' | \
  		cut -d' ' -f 1 | tr -d '\n' >> $testroot/stdout.expected
  	echo " (mode 644)" >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  
  	got diff -r $testroot/repo $tag1 $tag2 > $testroot/stdout
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_lightweight_tag() {
  	local testroot=`test_init diff_tag`
  	local commit_id0=`git_show_head $testroot/repo`
  	local tag1=1.0.0
  	local tag2=2.0.0
  
  	echo "modified alpha" > $testroot/repo/alpha
  	git_commit $testroot/repo -m "changed alpha"
  	local commit_id1=`git_show_head $testroot/repo`
  
  	(cd $testroot/repo && git tag $tag1)
  
  	echo "new file" > $testroot/repo/new
  	(cd $testroot/repo && git add new)
  	git_commit $testroot/repo -m "new file"
  	local commit_id2=`git_show_head $testroot/repo`
  
  	(cd $testroot/repo && git tag $tag2)
  
  	echo "diff $commit_id0 refs/tags/$tag1" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id0 -i | grep 'alpha$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'alpha$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  
  	got diff -r $testroot/repo $commit_id0 $tag1 > $testroot/stdout
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "diff refs/tags/$tag1 refs/tags/$tag2" > $testroot/stdout.expected
  	echo "blob - /dev/null" >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i -c $commit_id2 | grep 'new$' | \
  		cut -d' ' -f 1 | tr -d '\n' >> $testroot/stdout.expected
  	echo " (mode 644)" >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  
  	got diff -r $testroot/repo $tag1 $tag2 > $testroot/stdout
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_ignore_whitespace() {
  	local testroot=`test_init diff_ignore_whitespace`
  	local commit_id0=`git_show_head $testroot/repo`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "alpha   " > $testroot/wt/alpha
  
  	(cd $testroot/wt && got diff -w > $testroot/stdout)
  
  	echo "diff $commit_id0 $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id0 -i | grep 'alpha$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + alpha' >> $testroot/stdout.expected
  
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_submodule_of_same_repo() {
  	local testroot=`test_init diff_submodule_of_same_repo`
  
  	(cd $testroot && git clone -q repo repo2 >/dev/null)
  	(cd $testroot/repo && git submodule -q add ../repo2)
  	(cd $testroot/repo && git commit -q -m 'adding submodule')
  
  	epsilon_id=$(got tree -r $testroot/repo -i | grep 'epsilon/$' | \
  		cut -d ' ' -f 1)
  	submodule_id=$(got tree -r $testroot/repo -i | grep 'repo2\$$' | \
  		cut -d ' ' -f 1)
  
  	# Attempt a (nonsensical) diff between a tree object and a submodule.
  	# Currently fails with "wrong type of object" error
  	got diff -r $testroot/repo $epsilon_id $submodule_id \
  		> $testroot/stdout 2> $testroot/stderr
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff command succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: wrong type of object" > $testroot/stderr.expected
  
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		return 1
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_symlinks_in_work_tree() {
  	local testroot=`test_init diff_symlinks_in_work_tree`
  
  	(cd $testroot/repo && ln -s alpha alpha.link)
  	(cd $testroot/repo && ln -s epsilon epsilon.link)
  	(cd $testroot/repo && ln -s /etc/passwd passwd.link)
  	(cd $testroot/repo && ln -s ../beta epsilon/beta.link)
  	(cd $testroot/repo && ln -s nonexistent nonexistent.link)
  	(cd $testroot/repo && ln -s .got/foo dotgotfoo.link)
  	(cd $testroot/repo && git add .)
  	git_commit $testroot/repo -m "add symlinks"
  	local commit_id1=`git_show_head $testroot/repo`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	(cd $testroot/wt && ln -sf beta alpha.link)
  	(cd $testroot/wt && ln -sfh gamma epsilon.link)
  	(cd $testroot/wt && ln -sf ../gamma/delta epsilon/beta.link)
  	echo -n '.got/bar' > $testroot/wt/dotgotfoo.link
  	(cd $testroot/wt && got rm nonexistent.link > /dev/null)
  	(cd $testroot/wt && ln -sf epsilon/zeta zeta.link)
  	(cd $testroot/wt && got add zeta.link > /dev/null)
  	(cd $testroot/wt && got diff > $testroot/stdout)
  
  	echo "diff $commit_id1 $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'alpha.link@ -> alpha$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + alpha.link' >> $testroot/stdout.expected
  	echo '--- alpha.link' >> $testroot/stdout.expected
  	echo '+++ alpha.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+beta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'dotgotfoo.link@ -> .got/foo$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + dotgotfoo.link' >> $testroot/stdout.expected
  	echo '--- dotgotfoo.link' >> $testroot/stdout.expected
  	echo '+++ dotgotfoo.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-.got/foo' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+.got/bar' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i epsilon | \
  		grep 'beta.link@ -> ../beta$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + epsilon/beta.link' >> $testroot/stdout.expected
  	echo '--- epsilon/beta.link' >> $testroot/stdout.expected
  	echo '+++ epsilon/beta.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-../beta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+../gamma/delta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'epsilon.link@ -> epsilon$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + epsilon.link' >> $testroot/stdout.expected
  	echo '--- epsilon.link' >> $testroot/stdout.expected
  	echo '+++ epsilon.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-epsilon' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+gamma' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'nonexistent.link@ -> nonexistent$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo 'file + /dev/null' >> $testroot/stdout.expected
  	echo '--- nonexistent.link' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-nonexistent' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + zeta.link' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ zeta.link' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+epsilon/zeta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_symlinks_in_repo() {
  	local testroot=`test_init diff_symlinks_in_repo`
  
  	(cd $testroot/repo && ln -s alpha alpha.link)
  	(cd $testroot/repo && ln -s epsilon epsilon.link)
  	(cd $testroot/repo && ln -s /etc/passwd passwd.link)
  	(cd $testroot/repo && ln -s ../beta epsilon/beta.link)
  	(cd $testroot/repo && ln -s nonexistent nonexistent.link)
  	(cd $testroot/repo && ln -s .got/foo dotgotfoo.link)
  	(cd $testroot/repo && git add .)
  	git_commit $testroot/repo -m "add symlinks"
  	local commit_id1=`git_show_head $testroot/repo`
  
  	(cd $testroot/repo && ln -sf beta alpha.link)
  	(cd $testroot/repo && ln -sfh gamma epsilon.link)
  	(cd $testroot/repo && ln -sf ../gamma/delta epsilon/beta.link)
  	(cd $testroot/repo && ln -sf .got/bar $testroot/repo/dotgotfoo.link)
  	(cd $testroot/repo && git rm -q nonexistent.link)
  	(cd $testroot/repo && ln -sf epsilon/zeta zeta.link)
  	(cd $testroot/repo && git add .)
  	git_commit $testroot/repo -m "change symlinks"
  	local commit_id2=`git_show_head $testroot/repo`
  
  	got diff -r $testroot/repo $commit_id1 $commit_id2 > $testroot/stdout
  
  	echo "diff $commit_id1 $commit_id2" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'alpha.link@ -> alpha$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id2 -i | \
  		grep 'alpha.link@ -> beta$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo '--- alpha.link' >> $testroot/stdout.expected
  	echo '+++ alpha.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+beta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'dotgotfoo.link@ -> .got/foo$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id2 -i | \
  		grep 'dotgotfoo.link@ -> .got/bar$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo '--- dotgotfoo.link' >> $testroot/stdout.expected
  	echo '+++ dotgotfoo.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-.got/foo' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+.got/bar' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i epsilon | \
  		grep 'beta.link@ -> ../beta$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id2 -i epsilon | \
  		grep 'beta.link@ -> ../gamma/delta$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo '--- epsilon/beta.link' >> $testroot/stdout.expected
  	echo '+++ epsilon/beta.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-../beta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+../gamma/delta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'epsilon.link@ -> epsilon$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id2 -i | \
  		grep 'epsilon.link@ -> gamma$' | \
  		cut -d' ' -f 1 >> $testroot/stdout.expected
  	echo '--- epsilon.link' >> $testroot/stdout.expected
  	echo '+++ epsilon.link' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-epsilon' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo '+gamma' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id1 -i | \
  		grep 'nonexistent.link@ -> nonexistent$' | \
  		cut -d' ' -f 1 | sed -e 's/$/ (mode 120000)/' \
  		>> $testroot/stdout.expected
  	echo 'blob + /dev/null' >> $testroot/stdout.expected
  	echo '--- nonexistent.link' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-nonexistent' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo -n 'blob + ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -c $commit_id2 -i | \
  		grep 'zeta.link@ -> epsilon/zeta$' | \
  		cut -d' ' -f 1 | sed -e 's/$/ (mode 120000)/' \
  		>> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ zeta.link' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+epsilon/zeta' >> $testroot/stdout.expected
  	echo '\ No newline at end of file' >> $testroot/stdout.expected
  
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_binary_files() {
  	local testroot=`test_init diff_binary_files`
  	local head_rev=`git_show_head $testroot/repo`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	printf '\377\377\0\0\377\377\0\0' > $testroot/wt/foo
  	(cd $testroot/wt && got add foo >/dev/null)
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + foo' >> $testroot/stdout.expected
  	echo "Binary files /dev/null and foo differ" \
  		>> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -a -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo 'file + foo' >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ foo' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	printf '+\377\377\0\0\377\377\0\0\n' >> $testroot/stdout.expected
  	printf '\\ No newline at end of file\n' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff -a > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -a -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	(cd $testroot/wt && got commit -m 'add binary file' > /dev/null)
  	local head_rev=`git_show_head $testroot/repo`
  
  	printf '\377\200\0\0\377\200\0\0' > $testroot/wt/foo
  
  	echo "diff $head_rev $testroot/wt" > $testroot/stdout.expected
  	echo -n 'blob - ' >> $testroot/stdout.expected
  	got tree -r $testroot/repo -i | grep 'foo$' | cut -d' ' -f 1 \
  		>> $testroot/stdout.expected
  	echo 'file + foo' >> $testroot/stdout.expected
  	echo '--- foo' >> $testroot/stdout.expected
  	echo '+++ foo' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	printf -- '-\377\377\0\0\377\377\0\0\n' >> $testroot/stdout.expected
  	printf '\\ No newline at end of file\n' >> $testroot/stdout.expected
  	printf '+\377\200\0\0\377\200\0\0\n' >> $testroot/stdout.expected
  	printf '\\ No newline at end of file\n' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff -a > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -a -u $testroot/stdout.expected $testroot/stdout
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_diff_commits() {
  	local testroot=`test_init diff_commits`
  	local commit_id0=`git_show_head $testroot/repo`
  	alpha_id0=`get_blob_id $testroot/repo "" alpha`
  	beta_id0=`get_blob_id $testroot/repo "" beta`
  
  	got checkout $testroot/repo $testroot/wt > /dev/null
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "modified alpha" > $testroot/wt/alpha
  	(cd $testroot/wt && got rm beta >/dev/null)
  	echo "new file" > $testroot/wt/new
  	(cd $testroot/wt && got add new >/dev/null)
  	(cd $testroot/wt && got commit -m 'committing changes' >/dev/null)
  	local commit_id1=`git_show_head $testroot/repo`
  
  	alpha_id1=`get_blob_id $testroot/repo "" alpha`
  	new_id1=`get_blob_id $testroot/repo "" new`
  
  	echo "diff $commit_id0 refs/heads/master" > $testroot/stdout.expected
  	echo "blob - $alpha_id0" >> $testroot/stdout.expected
  	echo "blob + $alpha_id1" >> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  	echo "blob - $beta_id0 (mode 644)" >> $testroot/stdout.expected
  	echo 'blob + /dev/null' >> $testroot/stdout.expected
  	echo '--- beta' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-beta' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo "blob + $new_id1 (mode 644)" >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  
  	(cd $testroot/wt && got diff -c master > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# same diff with explicit parent commit ID
  	(cd $testroot/wt && got diff -c $commit_id0 -c master \
  		> $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# same diff with commit object IDs
  	echo "diff $commit_id0 $commit_id1" > $testroot/stdout.expected
  	echo "blob - $alpha_id0" >> $testroot/stdout.expected
  	echo "blob + $alpha_id1" >> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  	echo "blob - $beta_id0 (mode 644)" >> $testroot/stdout.expected
  	echo 'blob + /dev/null' >> $testroot/stdout.expected
  	echo '--- beta' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-beta' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo "blob + $new_id1 (mode 644)" >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 \
  		> $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# same diff, filtered by paths
  	echo "diff $commit_id0 $commit_id1" > $testroot/stdout.expected
  	echo "blob - $alpha_id0" >> $testroot/stdout.expected
  	echo "blob + $alpha_id1" >> $testroot/stdout.expected
  	echo '--- alpha' >> $testroot/stdout.expected
  	echo '+++ alpha' >> $testroot/stdout.expected
  	echo '@@ -1 +1 @@' >> $testroot/stdout.expected
  	echo '-alpha' >> $testroot/stdout.expected
  	echo '+modified alpha' >> $testroot/stdout.expected
  	(cd $testroot/repo && got diff -c $commit_id0 -c $commit_id1 alpha \
  		> $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  	# same in a work tree
  	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 alpha \
  		> $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	echo "diff $commit_id0 $commit_id1" > $testroot/stdout.expected
  	echo "blob - $beta_id0 (mode 644)" >> $testroot/stdout.expected
  	echo 'blob + /dev/null' >> $testroot/stdout.expected
  	echo '--- beta' >> $testroot/stdout.expected
  	echo '+++ /dev/null' >> $testroot/stdout.expected
  	echo '@@ -1 +0,0 @@' >> $testroot/stdout.expected
  	echo '-beta' >> $testroot/stdout.expected
  	echo 'blob - /dev/null' >> $testroot/stdout.expected
  	echo "blob + $new_id1 (mode 644)" >> $testroot/stdout.expected
  	echo '--- /dev/null' >> $testroot/stdout.expected
  	echo '+++ new' >> $testroot/stdout.expected
  	echo '@@ -0,0 +1 @@' >> $testroot/stdout.expected
  	echo '+new file' >> $testroot/stdout.expected
  	(cd $testroot/repo && got diff -c $commit_id0 -c $commit_id1 \
  		beta new > $testroot/stdout)
  	cmp -s $testroot/stdout.expected $testroot/stdout
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stdout.expected $testroot/stdout
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# more than two -c options are not allowed
  	(cd $testroot/repo && got diff -c $commit_id0 -c $commit_id1 -c foo \
  		2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: too many -c options used" > $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# use of -c options implies a repository diff; use with -P is an error
  	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 -P foo \
  		2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: -P option can only be used when diffing a work tree" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# use of -c options implies a repository diff; use with -s is an error
  	(cd $testroot/wt && got diff -c $commit_id0 -c $commit_id1 -s foo \
  		2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: -s option can only be used when diffing a work tree" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# three arguments imply use of path filtering (repository case)
  	(cd $testroot/repo && got diff $commit_id0 $commit_id1 foo \
  		2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: specified paths cannot be resolved: no got work tree found" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  		test_done "$testroot" "$ret"
  		return 1
  	fi
  
  	# three arguments imply use of path filtering (work tree case)
  	(cd $testroot/wt && got diff $commit_id0 master foo \
  		2> $testroot/stderr)
  	ret="$?"
  	if [ "$ret" = "0" ]; then
  		echo "diff succeeded unexpectedly" >&2
  		test_done "$testroot" "1"
  		return 1
  	fi
  	echo "got: $commit_id0: No such file or directory" \
  		> $testroot/stderr.expected
  	cmp -s $testroot/stderr.expected $testroot/stderr
  	ret="$?"
  	if [ "$ret" != "0" ]; then
  		diff -u $testroot/stderr.expected $testroot/stderr
  	fi
  	test_done "$testroot" "$ret"
  }
  
  test_parseargs "$@"
  run_test test_diff_basic
  run_test test_diff_shows_conflict
  run_test test_diff_tag
  run_test test_diff_lightweight_tag
  run_test test_diff_ignore_whitespace
  run_test test_diff_submodule_of_same_repo
  run_test test_diff_symlinks_in_work_tree
  run_test test_diff_symlinks_in_repo
  run_test test_diff_binary_files
  run_test test_diff_commits
  

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