Fix next ITs for Maven 4

.gitignore

@@ -4,4 +4,5 @@ out
 .project
 .settings
 .idea
-*.iml
+*.iml
+.DS_Store

src/it/projects/no-overwrite-3.6.3-later/invoker.properties

@@ -1,3 +1,3 @@
 # .flattened-pom.xml contains xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
 # xsd url changed to HTTPS in Maven 3.6.3 in https://issues.apache.org/jira/browse/MNG-6778
-invoker.maven.version = 3.6.3+
+invoker.maven.version = 3.6.3+,!4.0.0+

src/it/projects/no-overwrite-4.0.0-later/.flattened-pom.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.codehaus.mojo.flatten.its</groupId>
+  <artifactId>resolve-properties</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <dependencies>
+    <dependency>
+      <groupId>org.codehaus.mojo.flatten.its</groupId>
+      <artifactId>dep</artifactId>
+      <version>1.1</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+</project>

src/it/projects/no-overwrite-4.0.0-later/invoker.properties

@@ -0,0 +1,2 @@
+# Maven 4.0.0 has a different xml writer
+invoker.maven.version = 4.0.0+

src/it/projects/no-overwrite-4.0.0-later/pom.xml

@@ -0,0 +1,20 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.codehaus.mojo.flatten.its</groupId>
+  <artifactId>resolve-properties</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+
+  <properties>
+    <depVersion>1.1</depVersion>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.codehaus.mojo.flatten.its</groupId>
+      <artifactId>dep</artifactId>
+      <version>${depVersion}</version>
+    </dependency>
+  </dependencies>
+
+</project>

src/it/projects/no-overwrite-4.0.0-later/verify.groovy

@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+File flattendPom = new File( basedir, '.flattened-pom.xml' )
+assert flattendPom.exists()
+long now = System.currentTimeMillis()
+assert now - flattendPom.lastModified() > 20*1000