t3418: add testcase showing problems with rebase -i and strategy options

We are not passing the same args to merge strategies when we are doing an
--interactive rebase as we do with a --merge rebase.  The merge strategy
should not need to be aware of which type of rebase is in effect.  Add a
testcase which checks for the appropriate args.
Signed-off-by: NElijah Newren <newren@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t3418-rebase-continue.sh

@@ -74,6 +74,38 @@ test_expect_success 'rebase --continue remembers merge strategy and options' '
 	test -f funny.was.run
 '
 
+test_expect_failure 'rebase -i --continue handles merge strategy and options' '
+	rm -fr .git/rebase-* &&
+	git reset --hard commit-new-file-F2-on-topic-branch &&
+	test_commit "commit-new-file-F3-on-topic-branch-for-dash-i" F3 32 &&
+	test_when_finished "rm -fr test-bin funny.was.run funny.args" &&
+	mkdir test-bin &&
+	cat >test-bin/git-merge-funny <<-EOF &&
+	#!$SHELL_PATH
+	echo "\$@" >>funny.args
+	case "\$1" in --opt) ;; *) exit 2 ;; esac
+	case "\$2" in --foo) ;; *) exit 2 ;; esac
+	case "\$4" in --) ;; *) exit 2 ;; esac
+	shift 2 &&
+	>funny.was.run &&
+	exec git merge-recursive "\$@"
+	EOF
+	chmod +x test-bin/git-merge-funny &&
+	(
+		PATH=./test-bin:$PATH &&
+		test_must_fail git rebase -i -s funny -Xopt -Xfoo master topic
+	) &&
+	test -f funny.was.run &&
+	rm funny.was.run &&
+	echo "Resolved" >F2 &&
+	git add F2 &&
+	(
+		PATH=./test-bin:$PATH &&
+		git rebase --continue
+	) &&
+	test -f funny.was.run
+'
+
 test_expect_success 'rebase passes merge strategy options correctly' '
 	rm -fr .git/rebase-* &&
 	git reset --hard commit-new-file-F3-on-topic-branch &&