Add some --in-place tests

Makefile.am

@@ -268,7 +268,9 @@ TESTS = tests/newline1/run-test \
 	tests/whitespace-regression/run-test \
 	tests/interdiff-whitespace-w/run-test \
 	tests/patch-ignore-whitespace/run-test \
-	tests/whitespace-w/run-test
+	tests/whitespace-w/run-test \
+	tests/filterdiff-inplace1/run-test \
+	tests/rediff-inplace1/run-test
 
 # These ones don't work yet.
 # Feel free to send me patches. :-)

tests/filterdiff-inplace1/run-test

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# This is a filterdiff(1) testcase.
+# Test: --in-place option with --include filter
+
+. ${top_srcdir-.}/tests/common.sh
+
+cat << "EOF" > test.patch
+--- a/file1.txt	2023-01-01 00:00:00.000000000 +0000
++++ b/file1.txt	2023-01-01 00:00:01.000000000 +0000
+@@ -1,3 +1,3 @@
+ line 1
+-line 2
++line 2 modified
+ line 3
+--- a/file2.txt	2023-01-01 00:00:00.000000000 +0000
++++ b/file2.txt	2023-01-01 00:00:01.000000000 +0000
+@@ -1,2 +1,2 @@
+-old content
++new content
+ another line
+EOF
+
+# Test --in-place with --include
+${FILTERDIFF} --include="*file1*" --in-place test.patch || exit 1
+
+# Check that file was modified in place and contains only file1.txt
+cmp - test.patch << "EOF" || exit 1
+--- a/file1.txt	2023-01-01 00:00:00.000000000 +0000
++++ b/file1.txt	2023-01-01 00:00:01.000000000 +0000
+@@ -1,3 +1,3 @@
+ line 1
+-line 2
++line 2 modified
+ line 3
+EOF

tests/rediff-inplace1/run-test

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+# This is a rediff(1) testcase.
+# Test: --in-place option
+
+. ${top_srcdir-.}/tests/common.sh
+
+cat << "EOF" > patch.orig
+--- file
++++ file
+@@ -3,3 +3,4 @@
+ 1
+ 2
+ 3
++4.5
+EOF
+
+cat << "EOF" > patch.mod
+--- file
++++ file
+@@ -3,3 +3,4 @@
++4.5
+EOF
+
+# Test --in-place
+${REDIFF} --in-place patch.orig patch.mod || exit 1
+
+# Check that patch.mod was modified in place
+cmp - patch.mod << "EOF" || exit 1
+--- file
++++ file
+@@ -6,0 +6 @@
++4.5
+EOF