[PATCH 04/30] directory rename detection: basic testcases

[Elijah Newren <newren@gmail.com>]

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 t/t6043-merge-rename-directories.sh | 391 ++++++++++++++++++++++++++++++++++++
 1 file changed, 391 insertions(+)
 create mode 100755 t/t6043-merge-rename-directories.sh

diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
new file mode 100755
index 0000000000..b737b0a105
--- /dev/null
+++ b/t/t6043-merge-rename-directories.sh
@@ -0,0 +1,391 @@
+#!/bin/sh
+
+test_description="recursive merge with directory renames"
+# includes checking of many corner cases, with a similar methodology to:
+#   t6042: corner cases with renames but not criss-cross merges
+#   t6036: corner cases with both renames and criss-cross merges
+#
+# The setup for all of them, pictorially, is:
+#
+#      B
+#      o
+#     / \
+#  A o   ?
+#     \ /
+#      o
+#      C
+#
+# To help make it easier to follow the flow of tests, they have been
+# divided into sections and each test will start with a quick explanation
+# of what commits A, B, and C contain.
+#
+# Notation:
+#    z/{b,c}   means  files z/b and z/c both exist
+#    x/d_1     means  file x/d exists with content d1.  (Purpose of the
+#                     underscore notation is to differentiate different
+#                     files that might be renamed into each other's paths.)
+
+. ./test-lib.sh
+
+
+###########################################################################
+# SECTION 1: Basic cases we should be able to handle
+###########################################################################
+
+# Testcase 1a, Basic directory rename.
+#   Commit A: z/{b,c}
+#   Commit B: y/{b,c}
+#   Commit C: z/{b,c,d,e/f}
+#   Expected: y/{b,c,d,e/f}
+
+test_expect_success '1a-setup: Simple directory rename detection' '
+	mkdir z &&
+	echo b >z/b &&
+	echo c >z/c &&
+	git add z &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	git mv z y &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	echo d >z/d &&
+	mkdir z/e &&
+	echo f >z/e/f &&
+	git add z/d z/e/f &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1a-check: Simple directory rename detection' '
+	git checkout B^0 &&
+
+	git merge -s recursive C^0 &&
+
+	test 4 -eq $(git ls-files -s | wc -l) &&
+
+	test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+	test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+	test $(git rev-parse HEAD:y/d) = $(git rev-parse C:z/d) &&
+	test "$(git hash-object y/d)" = $(git rev-parse C:z/d) &&
+	test $(git rev-parse HEAD:y/e/f) = $(git rev-parse C:z/e/f) &&
+	test_must_fail git rev-parse HEAD:z/d &&
+	test_must_fail git rev-parse HEAD:z/e/f &&
+	test ! -d z/d &&
+	test ! -d z/e/f
+'
+
+# Testcase 1b, Merge a directory with another
+#   Commit A: z/{b,c},   y/d
+#   Commit B: z/{b,c,e}, y/d
+#   Commit C: y/{b,c,d}
+#   Expected: y/{b,c,d,e}
+
+test_expect_success '1b-setup: Merge a directory with another' '
+	git rm -rf . &&
+	git clean -fdqx &&
+	rm -rf .git &&
+	git init &&
+
+	mkdir z &&
+	echo b >z/b &&
+	echo c >z/c &&
+	mkdir y &&
+	echo d >y/d &&
+	git add z y &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	echo e >z/e &&
+	git add z/e &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	git mv z/b y &&
+	git mv z/c y &&
+	rmdir z &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1b-check: Merge a directory with another' '
+	git checkout B^0 &&
+
+	git merge -s recursive C^0 &&
+
+	test 4 -eq $(git ls-files -s | wc -l) &&
+
+	test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+	test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+	test $(git rev-parse HEAD:y/d) = $(git rev-parse A:y/d) &&
+	test $(git rev-parse HEAD:y/e) = $(git rev-parse B:z/e) &&
+	test_must_fail git rev-parse HEAD:z/e
+'
+
+# Testcase 1c, Transitive renaming
+#   (Related to testcases 3a and 6d -- when should a transitive rename apply?)
+#   (Related to testcases 9c and 9d -- can transitivity repeat?)
+#   Commit A: z/{b,c},   x/d
+#   Commit B: y/{b,c},   x/d
+#   Commit C: z/{b,c,d}
+#   Expected: y/{b,c,d}  (because x/d -> z/d -> y/d)
+
+test_expect_success '1c-setup: Transitive renaming' '
+	git rm -rf . &&
+	git clean -fdqx &&
+	rm -rf .git &&
+	git init &&
+
+	mkdir z &&
+	echo b >z/b &&
+	echo c >z/c &&
+	mkdir x &&
+	echo d >x/d &&
+	git add z x &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	git mv z y &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	git mv x/d z/d &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1c-check: Transitive renaming' '
+	git checkout B^0 &&
+
+	git merge -s recursive C^0 &&
+
+	test 3 -eq $(git ls-files -s | wc -l) &&
+
+	test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+	test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+	test $(git rev-parse HEAD:y/d) = $(git rev-parse A:x/d) &&
+	test_must_fail git rev-parse HEAD:x/d &&
+	test_must_fail git rev-parse HEAD:z/d &&
+	test ! -f z/d
+'
+
+# Testcase 1d, Directory renames (merging two directories into one new one)
+#              cause a rename/rename(2to1) conflict
+#   (Related to testcases 1c and 7b)
+#   Commit A. z/{b,c},        y/{d,e}
+#   Commit B. x/{b,c},        y/{d,e,m,wham}
+#   Commit C. z/{b,c,n,wham}, x/{d,e}
+#   Expected: x/{b,c,d,e,m,n}, CONFLICT:(y/wham & z/wham -> x/wham)
+#   Note: y/m & z/n should definitely move into x.  By the same token, both
+#         y/wham & z/wham should to...giving us a conflict.
+
+test_expect_success '1d-setup: Directory renames cause a rename/rename(2to1) conflict' '
+	git rm -rf . &&
+	git clean -fdqx &&
+	rm -rf .git &&
+	git init &&
+
+	mkdir z &&
+	echo b >z/b &&
+	echo c >z/c &&
+	mkdir y &&
+	echo d >y/d &&
+	echo e >y/e &&
+	git add z y &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	git mv z x &&
+	echo m >y/m &&
+	echo wham1 >y/wham &&
+	git add y &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	git mv y x &&
+	echo n >z/n &&
+	echo wham2 >z/wham &&
+	git add z &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1d-check: Directory renames cause a rename/rename(2to1) conflict' '
+	git checkout B^0 &&
+
+	test_must_fail git merge -s recursive C^0 >out &&
+	test_i18ngrep "CONFLICT (rename/rename)" out &&
+
+	test 8 -eq $(git ls-files -s | wc -l) &&
+	test 2 -eq $(git ls-files -u | wc -l) &&
+	test 3 -eq $(git ls-files -o | wc -l) &&
+
+	test $(git rev-parse :0:x/b) = $(git rev-parse A:z/b) &&
+	test $(git rev-parse :0:x/c) = $(git rev-parse A:z/c) &&
+	test $(git rev-parse :0:x/d) = $(git rev-parse A:y/d) &&
+	test $(git rev-parse :0:x/e) = $(git rev-parse A:y/e) &&
+	test $(git rev-parse :0:x/m) = $(git rev-parse B:y/m) &&
+	test $(git rev-parse :0:x/n) = $(git rev-parse C:z/n) &&
+
+	test_must_fail git rev-parse :0:x/wham &&
+	test $(git rev-parse :2:x/wham) = $(git rev-parse B:y/wham) &&
+	test $(git rev-parse :3:x/wham) = $(git rev-parse C:z/wham) &&
+
+	test ! -f x/wham &&
+	test -f x/wham~HEAD &&
+	test -f x/wham~C^0 &&
+
+	test $(git hash-object x/wham~HEAD) = $(git rev-parse B:y/wham) &&
+	test $(git hash-object x/wham~C^0) = $(git rev-parse C:z/wham)
+'
+
+# Testcase 1e, Renamed directory, with all filenames being renamed too
+#   Commit A: z/{oldb,oldc}
+#   Commit B: y/{newb,newc}
+#   Commit C: z/{oldb,oldc,d}
+#   Expected: y/{newb,newc,d}
+
+test_expect_success '1e-setup: Renamed directory, with all files being renamed too' '
+	git rm -rf . &&
+	git clean -fdqx &&
+	rm -rf .git &&
+	git init &&
+
+	mkdir z &&
+	echo b >z/oldb &&
+	echo c >z/oldc &&
+	git add z &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	mkdir y &&
+	git mv z/oldb y/newb &&
+	git mv z/oldc y/newc &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	echo d >z/d &&
+	git add z/d &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1e-check: Renamed directory, with all files being renamed too' '
+	git checkout B^0 &&
+
+	git merge -s recursive C^0 &&
+
+	test 3 -eq $(git ls-files -s | wc -l) &&
+
+	test $(git rev-parse HEAD:y/newb) = $(git rev-parse A:z/oldb) &&
+	test $(git rev-parse HEAD:y/newc) = $(git rev-parse A:z/oldc) &&
+	test $(git rev-parse HEAD:y/d)    = $(git rev-parse C:z/d) &&
+	test_must_fail git rev-parse HEAD:z/d
+'
+
+# Testcase 1f, Split a directory into two other directories
+#   (Related to testcases 3a, all of section 2, and all of section 4)
+#   Commit A: z/{b,c,d,e,f}
+#   Commit B: z/{b,c,d,e,f,g}
+#   Commit C: y/{b,c}, x/{d,e,f}
+#   Expected: y/{b,c}, x/{d,e,f,g}
+
+test_expect_success '1f-setup: Split a directory into two other directories' '
+	git rm -rf . &&
+	git clean -fdqx &&
+	rm -rf .git &&
+	git init &&
+
+	mkdir z &&
+	echo b >z/b &&
+	echo c >z/c &&
+	echo d >z/d &&
+	echo e >z/e &&
+	echo f >z/f &&
+	git add z &&
+	test_tick &&
+	git commit -m "A" &&
+
+	git branch A &&
+	git branch B &&
+	git branch C &&
+
+	git checkout B &&
+	echo g >z/g &&
+	git add z/g &&
+	test_tick &&
+	git commit -m "B" &&
+
+	git checkout C &&
+	mkdir y &&
+	mkdir x &&
+	git mv z/b y/ &&
+	git mv z/c y/ &&
+	git mv z/d x/ &&
+	git mv z/e x/ &&
+	git mv z/f x/ &&
+	rmdir z &&
+	test_tick &&
+	git commit -m "C"
+'
+
+test_expect_failure '1f-check: Split a directory into two other directories' '
+	git checkout B^0 &&
+
+	git merge -s recursive C^0 &&
+
+	test 6 -eq $(git ls-files -s | wc -l) &&
+
+	test $(git rev-parse HEAD:y/b) = $(git rev-parse A:z/b) &&
+	test $(git rev-parse HEAD:y/c) = $(git rev-parse A:z/c) &&
+	test $(git rev-parse HEAD:x/d) = $(git rev-parse A:z/d) &&
+	test $(git rev-parse HEAD:x/e) = $(git rev-parse A:z/e) &&
+	test $(git rev-parse HEAD:x/f) = $(git rev-parse A:z/f) &&
+	test $(git rev-parse HEAD:x/g) = $(git rev-parse B:z/g) &&
+	test ! -f z/g &&
+	test_must_fail git rev-parse HEAD:z/g
+'
+
+###########################################################################
+# Rules suggested by testcases in section 1:
+#
+#   We should still detect the directory rename even if it wasn't just
+#   the directory renamed, but the files within it. (see 1b)
+#
+#   If renames split a directory into two or more others, the directory
+#   with the most renames, "wins" (see 1c).  However, see the testcases
+#   in section 2, plus testcases 3a and 4a.
+###########################################################################
+
+test_done
-- 
2.15.0.5.g9567be9905