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diff --git a/t/t6023-merge-file.sh b/t/t6023-merge-file.sh
new file mode 100755
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+++ b/t/t6023-merge-file.sh
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+#!/bin/sh
+
+test_description='RCS merge replacement: merge-file'
+. ./test-lib.sh
+
+cat > orig.txt << EOF
+Dominus regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new1.txt << EOF
+Dominus regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+cat > new2.txt << EOF
+Dominus regit me, et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new3.txt << EOF
+DOMINUS regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new4.txt << EOF
+Dominus regit me, et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+EOF
+printf "propter nomen suum." >> new4.txt
+
+cp new1.txt test.txt
+test_expect_success "merge without conflict" \
+	"git merge-file test.txt orig.txt new2.txt"
+
+cp new1.txt test2.txt
+test_expect_success "merge without conflict (missing LF at EOF)" \
+	"git merge-file test2.txt orig.txt new2.txt"
+
+test_expect_success "merge result added missing LF" \
+	"test_cmp test.txt test2.txt"
+
+cp test.txt backup.txt
+test_expect_success "merge with conflicts" \
+	"test_must_fail git merge-file test.txt orig.txt new3.txt"
+
+cat > expect.txt << EOF
+<<<<<<< test.txt
+Dominus regit me, et nihil mihi deerit.
+=======
+DOMINUS regit me,
+et nihil mihi deerit.
+>>>>>>> new3.txt
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+test_expect_success "expected conflict markers" "test_cmp test.txt expect.txt"
+
+cp backup.txt test.txt
+test_expect_success "merge with conflicts, using -L" \
+	"test_must_fail git merge-file -L 1 -L 2 test.txt orig.txt new3.txt"
+
+cat > expect.txt << EOF
+<<<<<<< 1
+Dominus regit me, et nihil mihi deerit.
+=======
+DOMINUS regit me,
+et nihil mihi deerit.
+>>>>>>> new3.txt
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+test_expect_success "expected conflict markers, with -L" \
+	"test_cmp test.txt expect.txt"
+
+sed "s/ tu / TU /" < new1.txt > new5.txt
+test_expect_success "conflict in removed tail" \
+	"test_must_fail git merge-file -p orig.txt new1.txt new5.txt > out"
+
+cat > expect << EOF
+Dominus regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+<<<<<<< orig.txt
+=======
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam TU mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+>>>>>>> new5.txt
+EOF
+
+test_expect_success "expected conflict markers" "test_cmp expect out"
+
+test_expect_success 'binary files cannot be merged' '
+	test_must_fail git merge-file -p \
+		orig.txt "$TEST_DIRECTORY"/test4012.png new1.txt 2> merge.err &&
+	grep "Cannot merge binary files" merge.err
+'
+
+sed -e "s/deerit.$/deerit;/" -e "s/me;$/me./" < new5.txt > new6.txt
+sed -e "s/deerit.$/deerit,/" -e "s/me;$/me,/" < new5.txt > new7.txt
+
+test_expect_success 'MERGE_ZEALOUS simplifies non-conflicts' '
+
+	test_must_fail git merge-file -p new6.txt new5.txt new7.txt > output &&
+	test 1 = $(grep ======= < output | wc -l)
+
+'
+
+sed -e 's/deerit./&\n\n\n\n/' -e "s/locavit,/locavit;/" < new6.txt > new8.txt
+sed -e 's/deerit./&\n\n\n\n/' -e "s/locavit,/locavit --/" < new7.txt > new9.txt
+
+test_expect_success 'ZEALOUS_ALNUM' '
+
+	test_must_fail git merge-file -p \
+		new8.txt new5.txt new9.txt > merge.out &&
+	test 1 = $(grep ======= < merge.out | wc -l)
+
+'
+
+test_done