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+#!/bin/sh
+
+test_description="merge cases"
+
+# The setup for all of them, pictorially, is:
+#
+# A
+# o
+# / \
+# O o ?
+# \ /
+# o
+# B
+#
+# 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 O, A, and B 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
+. "$TEST_DIRECTORY"/lib-merge.sh
+
+
+# Testcase basic, conflicting changes in 'numerals'
+
+test_setup_numerals () {
+ test_create_repo numerals_$1 &&
+ (
+ cd numerals_$1 &&
+
+ >README &&
+ test_write_lines I II III >numerals &&
+ git add README numerals &&
+ test_tick &&
+ git commit -m "O" &&
+
+ git branch O &&
+ git branch A &&
+ git branch B &&
+
+ git checkout A &&
+ test_write_lines I II III IIII >numerals &&
+ git add numerals &&
+ test_tick &&
+ git commit -m "A" &&
+
+ git checkout B &&
+ test_write_lines I II III IV >numerals &&
+ git add numerals &&
+ test_tick &&
+ git commit -m "B" &&
+
+ cat <<-EOF >expected-index &&
+ H README
+ M numerals
+ M numerals
+ M numerals
+ EOF
+
+ cat <<-EOF >expected-merge
+ I
+ II
+ III
+ <<<<<<< HEAD
+ IIII
+ =======
+ IV
+ >>>>>>> B^0
+ EOF
+
+ )
+}
+
+test_expect_success 'conflicting entries written to worktree even if sparse' '
+ test_setup_numerals plain &&
+ (
+ cd numerals_plain &&
+
+ git checkout A^0 &&
+
+ test_path_is_file README &&
+ test_path_is_file numerals &&
+
+ git sparse-checkout init &&
+ git sparse-checkout set README &&
+
+ test_path_is_file README &&
+ test_path_is_missing numerals &&
+
+ test_must_fail git merge -s recursive B^0 &&
+
+ git ls-files -t >index_files &&
+ test_cmp expected-index index_files &&
+
+ test_path_is_file README &&
+ test_path_is_file numerals &&
+
+ test_cmp expected-merge numerals &&
+
+ # 4 other files:
+ # * expected-merge
+ # * expected-index
+ # * index_files
+ # * others
+ git ls-files -o >others &&
+ test_line_count = 4 others
+ )
+'
+
+test_expect_merge_algorithm failure success 'present-despite-SKIP_WORKTREE handled reasonably' '
+ test_setup_numerals in_the_way &&
+ (
+ cd numerals_in_the_way &&
+
+ git checkout A^0 &&
+
+ test_path_is_file README &&
+ test_path_is_file numerals &&
+
+ git sparse-checkout init &&
+ git sparse-checkout set README &&
+
+ test_path_is_file README &&
+ test_path_is_missing numerals &&
+
+ echo foobar >numerals &&
+
+ test_must_fail git merge -s recursive B^0 &&
+
+ git ls-files -t >index_files &&
+ test_cmp expected-index index_files &&
+
+ test_path_is_file README &&
+ test_path_is_file numerals &&
+
+ test_cmp expected-merge numerals &&
+
+ # There should still be a file with "foobar" in it
+ grep foobar * &&
+
+ # 5 other files:
+ # * expected-merge
+ # * expected-index
+ # * index_files
+ # * others
+ # * whatever name was given to the numerals file that had
+ # "foobar" in it
+ git ls-files -o >others &&
+ test_line_count = 5 others
+ )
+'
+
+test_done