Merge branch 'js/rebase-p-tests'

In preparation to the day when we can deprecate and remove the
"rebase -p", make sure we can skip and later remove tests for
it.

* js/rebase-p-tests:
  tests: optionally skip `git rebase -p` tests
  t3418: decouple test cases from a previous `rebase -p` test case
  t3404: decouple some test cases from outcomes of previous test cases

Author: gitster

t/t3404-rebase-interactive.sh

@@ -322,7 +322,7 @@ test_expect_success 'retain authorship when squashing' '
 	git show HEAD | grep "^Author: Twerp Snog"
 '
 
-test_expect_success '-p handles "no changes" gracefully' '
+test_expect_success REBASE_P '-p handles "no changes" gracefully' '
 	HEAD=$(git rev-parse HEAD) &&
 	set_fake_editor &&
 	git rebase -i -p HEAD^ &&
@@ -332,15 +332,15 @@ test_expect_success '-p handles "no changes" gracefully' '
 	test $HEAD = $(git rev-parse HEAD)
 '
 
-test_expect_failure 'exchange two commits with -p' '
+test_expect_failure REBASE_P 'exchange two commits with -p' '
 	git checkout H &&
 	set_fake_editor &&
 	FAKE_LINES="2 1" git rebase -i -p HEAD~2 &&
 	test H = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test G = $(git cat-file commit HEAD | sed -ne \$p)
 '
 
-test_expect_success 'preserve merges with -p' '
+test_expect_success REBASE_P 'preserve merges with -p' '
 	git checkout -b to-be-preserved master^ &&
 	: > unrelated-file &&
 	git add unrelated-file &&
@@ -383,7 +383,7 @@ test_expect_success 'preserve merges with -p' '
 	test $(git show HEAD:unrelated-file) = 1
 '
 
-test_expect_success 'edit ancestor with -p' '
+test_expect_success REBASE_P 'edit ancestor with -p' '
 	set_fake_editor &&
 	FAKE_LINES="1 2 edit 3 4" git rebase -i -p HEAD~3 &&
 	echo 2 > unrelated-file &&
@@ -397,6 +397,7 @@ test_expect_success 'edit ancestor with -p' '
 '
 
 test_expect_success '--continue tries to commit' '
+	git reset --hard D &&
 	test_tick &&
 	set_fake_editor &&
 	test_must_fail git rebase -i --onto new-branch1 HEAD^ &&
@@ -436,7 +437,7 @@ test_expect_success C_LOCALE_OUTPUT 'multi-fixup does not fire up editor' '
 		git rebase -i $base &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 0 = $(git show | grep NEVER | wc -l) &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D multi-fixup
 '
 
@@ -451,7 +452,7 @@ test_expect_success 'commit message used after conflict' '
 		git rebase --continue &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D conflict-fixup
 '
 
@@ -466,7 +467,7 @@ test_expect_success 'commit message retained after conflict' '
 		git rebase --continue &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 2 = $(git show | grep TWICE | wc -l) &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D conflict-squash
 '
 
@@ -491,7 +492,7 @@ test_expect_success C_LOCALE_OUTPUT 'squash and fixup generate correct log messa
 		grep "^# This is a combination of 3 commits\."  &&
 	git cat-file commit HEAD@{3} |
 		grep "^# This is a combination of 2 commits\."  &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D squash-fixup
 '
 
@@ -504,7 +505,7 @@ test_expect_success C_LOCALE_OUTPUT 'squash ignores comments' '
 		git rebase -i $base &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D skip-comments
 '
 
@@ -517,7 +518,7 @@ test_expect_success C_LOCALE_OUTPUT 'squash ignores blank lines' '
 		git rebase -i $base &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
-	git checkout to-be-rebased &&
+	git checkout @{-1} &&
 	git branch -D skip-blank-lines
 '
 
@@ -658,7 +659,7 @@ test_expect_success 'rebase with a file named HEAD in worktree' '
 	) &&
 
 	set_fake_editor &&
-	FAKE_LINES="1 squash 2" git rebase -i to-be-rebased &&
+	FAKE_LINES="1 squash 2" git rebase -i @{-1} &&
 	test "$(git show -s --pretty=format:%an)" = "Squashed Away"
 
 '

t/t3408-rebase-multi-line.sh

@@ -52,7 +52,7 @@ test_expect_success rebase '
 	test_cmp expect actual
 
 '
-test_expect_success rebasep '
+test_expect_success REBASE_P rebasep '
 
 	git checkout side-merge &&
 	git rebase -p side &&

t/t3409-rebase-preserve-merges.sh

@@ -8,6 +8,11 @@ Run "git rebase -p" and check that merges are properly carried along
 '
 . ./test-lib.sh
 
+if ! test_have_prereq REBASE_P; then
+	skip_all='skipping git rebase -p tests, as asked for'
+	test_done
+fi
+
 GIT_AUTHOR_EMAIL=bogus_email_address
 export GIT_AUTHOR_EMAIL
 

t/t3410-rebase-preserve-dropped-merges.sh

@@ -11,6 +11,11 @@ rewritten.
 '
 . ./test-lib.sh
 
+if ! test_have_prereq REBASE_P; then
+	skip_all='skipping git rebase -p tests, as asked for'
+	test_done
+fi
+
 # set up two branches like this:
 #
 # A - B - C - D - E

t/t3411-rebase-preserve-around-merges.sh

@@ -10,6 +10,11 @@ a merge to before the merge.
 '
 . ./test-lib.sh
 
+if ! test_have_prereq REBASE_P; then
+	skip_all='skipping git rebase -p tests, as asked for'
+	test_done
+fi
+
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
 set_fake_editor

t/t3412-rebase-root.sh

@@ -86,14 +86,14 @@ test_expect_success 'pre-rebase got correct input (4)' '
 	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work4
 '
 
-test_expect_success 'rebase -i -p with linear history' '
+test_expect_success REBASE_P 'rebase -i -p with linear history' '
 	git checkout -b work5 other &&
 	git rebase -i -p --root --onto master &&
 	git log --pretty=tformat:"%s" > rebased5 &&
 	test_cmp expect rebased5
 '
 
-test_expect_success 'pre-rebase got correct input (5)' '
+test_expect_success REBASE_P 'pre-rebase got correct input (5)' '
 	test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
 '
 
@@ -120,7 +120,7 @@ commit work6~4
 1
 EOF
 
-test_expect_success 'rebase -i -p with merge' '
+test_expect_success REBASE_P 'rebase -i -p with merge' '
 	git checkout -b work6 other &&
 	git rebase -i -p --root --onto master &&
 	log_with_names work6 > rebased6 &&
@@ -155,7 +155,7 @@ commit work7~5
 1
 EOF
 
-test_expect_success 'rebase -i -p with two roots' '
+test_expect_success REBASE_P 'rebase -i -p with two roots' '
 	git checkout -b work7 other &&
 	git rebase -i -p --root --onto master &&
 	log_with_names work7 > rebased7 &&
@@ -261,7 +261,7 @@ commit conflict3~6
 1
 EOF
 
-test_expect_success 'rebase -i -p --root with conflict (first part)' '
+test_expect_success REBASE_P 'rebase -i -p --root with conflict (first part)' '
 	git checkout -b conflict3 other &&
 	test_must_fail git rebase -i -p --root --onto master &&
 	git ls-files -u | grep "B$"
@@ -272,7 +272,7 @@ test_expect_success 'fix the conflict' '
 	git add B
 '
 
-test_expect_success 'rebase -i -p --root with conflict (second part)' '
+test_expect_success REBASE_P 'rebase -i -p --root with conflict (second part)' '
 	git rebase --continue &&
 	log_with_names conflict3 >out &&
 	test_cmp expect-conflict-p out

t/t3414-rebase-preserve-onto.sh

@@ -10,6 +10,11 @@ aren'"'"'t on top of $ONTO, even if they are on top of $UPSTREAM.
 '
 . ./test-lib.sh
 
+if ! test_have_prereq REBASE_P; then
+	skip_all='skipping git rebase -p tests, as asked for'
+	test_done
+fi
+
 . "$TEST_DIRECTORY"/lib-rebase.sh
 
 # Set up branches like this:

t/t3418-rebase-continue.sh

@@ -106,7 +106,7 @@ test_expect_success 'rebase -i --continue handles merge strategy and options' '
 	test -f funny.was.run
 '
 
-test_expect_success 'rebase passes merge strategy options correctly' '
+test_expect_success REBASE_P 'rebase passes merge strategy options correctly' '
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F3-on-topic-branch &&
 	test_commit theirs-to-merge &&
@@ -177,6 +177,7 @@ test_expect_success 'setup rerere database' '
 	git checkout master &&
 	test_commit "commit-new-file-F3" F3 3 &&
 	test_config rerere.enabled true &&
+	git update-ref refs/heads/topic commit-new-file-F3-on-topic-branch &&
 	test_must_fail git rebase -m master topic &&
 	echo "Resolved" >F2 &&
 	cp F2 expected-F2 &&
@@ -240,7 +241,7 @@ test_rerere_autoupdate
 test_rerere_autoupdate -m
 GIT_SEQUENCE_EDITOR=: && export GIT_SEQUENCE_EDITOR
 test_rerere_autoupdate -i
-test_rerere_autoupdate --preserve-merges
+test_have_prereq !REBASE_P || test_rerere_autoupdate --preserve-merges
 unset GIT_SEQUENCE_EDITOR
 
 test_expect_success 'the todo command "break" works' '