[MNG-6558] - ToolchainsBuildingResult event is not sent on EventSpy

Closes #42
diff --git a/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java b/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
index 6ca0637..c47ff0c 100644
--- a/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
+++ b/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
@@ -707,6 +707,7 @@
         suite.addTestSuite( MavenITmng6210CoreExtensionsCustomScopesTest.class );
         suite.addTestSuite( MavenITmng6352PrintVersionTest.class );
         suite.addTestSuite( MavenITmng6391PrintVersionTest.class );
+        suite.addTestSuite( MavenITmng6558ToolchainsBuildingEventTest.class );
         /*
          * Add tests in reverse alpha order above.
          */
diff --git a/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java b/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java
new file mode 100644
index 0000000..c4b2299
--- /dev/null
+++ b/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java
@@ -0,0 +1,66 @@
+package org.apache.maven.it;
+
+/*
+ * 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.
+ */
+
+import org.apache.maven.it.util.ResourceExtractor;
+
+import java.io.File;
+import java.util.List;
+
+/**
+ * This is a test set for <a href="https://issues.apache.org/jira/browse/MNG-6558">MNG-6558</a>.
+ */
+public class MavenITmng6558ToolchainsBuildingEventTest
+    extends AbstractMavenIntegrationTestCase
+{
+
+    public MavenITmng6558ToolchainsBuildingEventTest()
+    {
+        super( "[3.6.1-SNAPSHOT,)" );
+    }
+
+    /**
+     * Verify that <code>ToolchainsBuildingRequest</code> and <code>ToolchainsBuildingResult</code> events are sent to event spy.
+     */
+    public void testit()
+        throws Exception
+    {
+        File testDir = ResourceExtractor.simpleExtractResources( getClass(), "/mng-6558" );
+
+        Verifier verifier = newVerifier( testDir.getAbsolutePath() );
+        verifier.setForkJvm( true );
+        verifier.setAutoclean( false );
+        verifier.deleteDirectory( "target" );
+        verifier.setSystemProperty( "maven.ext.class.path", "spy-0.1.jar" );
+        verifier.addCliOption( "-X" );
+        verifier.executeGoal( "validate" );
+        verifier.verifyErrorFreeLog();
+        verifier.resetStreams();
+
+        List<String> lines = verifier.loadLines( "target/spy.log", "UTF-8" );
+        assertTrue( lines.toString(), lines.get( 0 ).startsWith( "init" ) );
+        assertTrue( lines.toString(), lines.get( lines.size() - 1 ).startsWith( "close" ) );
+        assertTrue( lines.toString(), 
+            lines.contains( "event: org.apache.maven.toolchain.building.DefaultToolchainsBuildingRequest" ) );
+        assertTrue( lines.toString(), 
+            lines.contains( "event: org.apache.maven.toolchain.building.DefaultToolchainsBuildingResult" ) );
+    }
+
+}
diff --git a/core-it-suite/src/test/resources/mng-6558/pom.xml b/core-it-suite/src/test/resources/mng-6558/pom.xml
new file mode 100644
index 0000000..ad73a0a
--- /dev/null
+++ b/core-it-suite/src/test/resources/mng-6558/pom.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+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.
+-->
+
+<project>
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.its.mng6558</groupId>
+  <artifactId>test</artifactId>
+  <version>0.1</version>
+  <packaging>jar</packaging>
+
+  <name>Maven Integration Test :: MNG-6558</name>
+  <description>
+    Verify that ToolchainsBuildingRequest and ToolchainsBuildingResult events are emitted via event spy.
+  </description>
+</project>
diff --git a/core-it-suite/src/test/resources/mng-6558/spy-0.1.jar b/core-it-suite/src/test/resources/mng-6558/spy-0.1.jar
new file mode 100644
index 0000000..f455c48
--- /dev/null
+++ b/core-it-suite/src/test/resources/mng-6558/spy-0.1.jar
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