Add test about consideration of properties in maven.config

org.eclipse.m2e.core.tests/resources/projects/mavenConfig/.mvn/extensions.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<extensions>
+	<extension>
+		<groupId>org.eclipse.tycho</groupId>
+		<artifactId>tycho-build</artifactId>
+		<version>${tycho-version-for-extension-test}</version>
+	</extension>
+</extensions>

org.eclipse.m2e.core.tests/resources/projects/mavenConfig/.mvn/maven.config

@@ -0,0 +1 @@
+-Dtycho-version-for-extension-test=4.0.6

org.eclipse.m2e.core.tests/resources/projects/mavenConfig/bundle/META-INF/MANIFEST.MF

@@ -0,0 +1,7 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: Bundle
+Bundle-SymbolicName: my.bundle3
+Bundle-Version: 1.0.0.qualifier
+Automatic-Module-Name: my.bundle
+Bundle-RequiredExecutionEnvironment: JavaSE-17

org.eclipse.m2e.core.tests/resources/projects/mavenConfig/bundle/build.properties

@@ -0,0 +1,4 @@
+source.. = src/
+output.. = bin/
+bin.includes = META-INF/,\
+               .

org.eclipse.m2e.core.tests/resources/projects/mavenConfig/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>test</groupId>
+	<artifactId>tycho-pomless</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>pom</packaging>
+	<modules>
+		<module>bundle</module>
+	</modules>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.eclipse.tycho</groupId>
+				<artifactId>tycho-maven-plugin</artifactId>
+				<version>${tycho-version-for-extension-test}</version>
+				<extensions>true</extensions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

org.eclipse.m2e.core.tests/src/org/eclipse/m2e/core/ExtensionsTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2022 Christoph Läubrich and others.
+ * Copyright (c) 2022, 2023 Christoph Läubrich and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
@@ -73,15 +73,25 @@ public void testLoadSameExtensionFromMultipleLocations() throws Exception {
 
 	@Test
 	public void testReloadExtensionAfterDeletion() throws Exception {
-		IProject project1 = importPomlessProject("pomless", "bundle/pom.xml");
+		IProject project = importPomlessProject("pomless", "bundle/pom.xml");
+
 		waitForJobsToComplete(monitor);
-		assertEquals("my.bundle", project1.getName());
+		assertEquals("my.bundle", project.getName());
 
 		WorkspaceHelpers.cleanWorkspace();
 
-		project1 = importPomlessProject("pomless", "bundle/pom.xml");
+		project = importPomlessProject("pomless", "bundle/pom.xml");
 		waitForJobsToComplete(monitor);
-		assertEquals("my.bundle", project1.getName());
+		assertEquals("my.bundle", project.getName());
+	}
+
+	@Test
+	public void testMavenConfigWithCoreExtension() throws Exception {
+		IProject project = importPomlessProject("mavenConfig", "bundle/pom.xml");
+
+		assertEquals("my.bundle3", project.getName());
+		assertTrue(project.hasNature("org.eclipse.m2e.core.maven2Nature"));
+		assertNoErrors(project);
 	}
 
 	@Test