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-rwxr-xr-xt/t4008-diff-break-rewrite.sh159
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+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Break and then rename
+
+We have two very different files, file0 and file1, registered in a tree.
+
+We update file1 so drastically that it is more similar to file0, and
+then remove file0. With -B, changes to file1 should be broken into
+separate delete and create, resulting in removal of file0, removal of
+original file1 and creation of completely rewritten file1. The latter
+two are then merged back into a single "complete rewrite".
+
+Further, with -B and -M together, these three modifications should
+turn into rename-edit of file0 into file1.
+
+Starting from the same two files in the tree, we swap file0 and file1.
+With -B, this should be detected as two complete rewrites.
+
+Further, with -B and -M together, these should turn into two renames.
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
+
+test_expect_success setup '
+ echo some dissimilar content >file0 &&
+ COPYING_test_data >file1 &&
+ blob0_id=$(git hash-object file0) &&
+ blob1_id=$(git hash-object file1) &&
+ git update-index --add file0 file1 &&
+ git tag reference $(git write-tree)
+'
+
+test_expect_success 'change file1 with copy-edit of file0 and remove file0' '
+ sed -e "s/git/GIT/" file0 >file1 &&
+ blob2_id=$(git hash-object file1) &&
+ rm -f file0 &&
+ git update-index --remove file0 file1
+'
+
+test_expect_success 'run diff with -B (#1)' '
+ git diff-index -B --cached reference >current &&
+ cat >expect <<-EOF &&
+ :100644 000000 $blob0_id $ZERO_OID D file0
+ :100644 100644 $blob1_id $blob2_id M100 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'run diff with -B and -M (#2)' '
+ git diff-index -B -M reference >current &&
+ cat >expect <<-EOF &&
+ :100644 100644 $blob0_id $blob2_id R100 file0 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'swap file0 and file1' '
+ rm -f file0 file1 &&
+ git read-tree -m reference &&
+ git checkout-index -f -u -a &&
+ mv file0 tmp &&
+ mv file1 file0 &&
+ mv tmp file1 &&
+ git update-index file0 file1
+'
+
+test_expect_success 'run diff with -B (#3)' '
+ git diff-index -B reference >current &&
+ cat >expect <<-EOF &&
+ :100644 100644 $blob0_id $blob1_id M100 file0
+ :100644 100644 $blob1_id $blob0_id M100 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'run diff with -B and -M (#4)' '
+ git diff-index -B -M reference >current &&
+ cat >expect <<-EOF &&
+ :100644 100644 $blob1_id $blob1_id R100 file1 file0
+ :100644 100644 $blob0_id $blob0_id R100 file0 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'make file0 into something completely different' '
+ rm -f file0 &&
+ test_ln_s_add frotz file0 &&
+ slink_id=$(printf frotz | git hash-object --stdin) &&
+ git update-index file1
+'
+
+test_expect_success 'run diff with -B (#5)' '
+ git diff-index -B reference >current &&
+ cat >expect <<-EOF &&
+ :100644 120000 $blob0_id $slink_id T file0
+ :100644 100644 $blob1_id $blob0_id M100 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'run diff with -B -M (#6)' '
+ git diff-index -B -M reference >current &&
+
+ # file0 changed from regular to symlink. file1 is the same as the preimage
+ # of file0. Because the change does not make file0 disappear, file1 is
+ # denoted as a copy of file0
+ cat >expect <<-EOF &&
+ :100644 120000 $blob0_id $slink_id T file0
+ :100644 100644 $blob0_id $blob0_id C file0 file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'run diff with -M (#7)' '
+ git diff-index -M reference >current &&
+
+ # This should not mistake file0 as the copy source of new file1
+ # due to type differences.
+ cat >expect <<-EOF &&
+ :100644 120000 $blob0_id $slink_id T file0
+ :100644 100644 $blob1_id $blob0_id M file1
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'file1 edited to look like file0 and file0 rename-edited to file2' '
+ rm -f file0 file1 &&
+ git read-tree -m reference &&
+ git checkout-index -f -u -a &&
+ sed -e "s/git/GIT/" file0 >file1 &&
+ sed -e "s/git/GET/" file0 >file2 &&
+ blob3_id=$(git hash-object file2) &&
+ rm -f file0 &&
+ git update-index --add --remove file0 file1 file2
+'
+
+test_expect_success 'run diff with -B (#8)' '
+ git diff-index -B reference >current &&
+ cat >expect <<-EOF &&
+ :100644 000000 $blob0_id $ZERO_OID D file0
+ :100644 100644 $blob1_id $blob2_id M100 file1
+ :000000 100644 $ZERO_OID $blob3_id A file2
+ EOF
+ compare_diff_raw expect current
+'
+
+test_expect_success 'run diff with -B -C (#9)' '
+ git diff-index -B -C reference >current &&
+ cat >expect <<-EOF &&
+ :100644 100644 $blob0_id $blob2_id C095 file0 file1
+ :100644 100644 $blob0_id $blob3_id R095 file0 file2
+ EOF
+ compare_diff_raw expect current
+'
+
+test_done