From 44431b85e6474ad59e1a04c05357bfc421b77c1a Mon Sep 17 00:00:00 2001
From: Andrzej Jarmoniuk <gh@jarmoniuk.nl>
Date: Sat, 27 Aug 2022 13:09:07 +0200
Subject: [PATCH] Extension of AbstractMojoTestCase from maven testing harness,
 adding a possibility of injecting a project without having to create project
 stubs.

---
 .../mojo/versions/utils/BaseMojoTestCase.java | 113 ++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/test/java/org/codehaus/mojo/versions/utils/BaseMojoTestCase.java

diff --git a/src/test/java/org/codehaus/mojo/versions/utils/BaseMojoTestCase.java b/src/test/java/org/codehaus/mojo/versions/utils/BaseMojoTestCase.java
new file mode 100644
index 000000000..5900ff12c
--- /dev/null
+++ b/src/test/java/org/codehaus/mojo/versions/utils/BaseMojoTestCase.java
@@ -0,0 +1,113 @@
+package org.codehaus.mojo.versions.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collections;
+
+import org.apache.maven.model.Build;
+import org.apache.maven.model.Model;
+import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
+import org.apache.maven.plugin.testing.AbstractMojoTestCase;
+import org.apache.maven.plugin.testing.stubs.MavenProjectStub;
+import org.codehaus.mojo.versions.SetMojo;
+import org.codehaus.plexus.util.ReaderFactory;
+import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
+
+/*
+ * 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.
+ */
+
+/**
+ * <p>Extension of the {@link AbstractMojoTestCase} class, providing support
+ * for loading projects specified by POM file path (instead of
+ * using stubs with <i>implementation</i> hint).</p>
+ *
+ * <p>Example usage:</p>
+ *
+ * <pre>
+ *     // provide the path to the POM containing the tested project
+ *     SetMojo myMojo = createMojo( "set", "src/test/resources/org/codehaus/mojo/set/versionless-01/pom.xml" );
+ *     assertNotNull( myMojo );
+ *     myMojo.execute();
+ * </pre>
+ * @author Andrzej Jarmoniuk
+ */
+public abstract class BaseMojoTestCase extends AbstractMojoTestCase
+{
+    /**
+     * Lookup the mojo leveraging the actual subprojects pom
+     * and injects the project using the given pom file path.
+     *
+     * @param goal        to execute on the plugin
+     * @param pomFilePath path to the pom project to inject
+     * @return a Mojo instance
+     * @throws Exception thrown if mojo lookup fails
+     */
+    protected SetMojo createMojo( String goal, String pomFilePath ) throws Exception
+    {
+        File pomFile = new File( pomFilePath );
+        SetMojo mojo = (SetMojo) lookupMojo( goal, pomFile );
+        mojo.setProject( new TestProjectStub( pomFile ) );
+        return mojo;
+    }
+
+    private static class TestProjectStub extends MavenProjectStub
+    {
+        private final File pomFile;
+
+        /**
+         * Default constructor
+         */
+        private TestProjectStub( File pomFile ) throws IOException, XmlPullParserException
+        {
+            this.pomFile = pomFile;
+            MavenXpp3Reader pomReader = new MavenXpp3Reader();
+            Model model = pomReader.read( ReaderFactory.newXmlReader( pomFile ) );
+            model.setPomFile( pomFile );
+
+            setModel( model );
+            setOriginalModel( model.clone() );
+            setGroupId( model.getGroupId() );
+            setArtifactId( model.getArtifactId() );
+            setVersion( model.getVersion() );
+            setName( model.getName() );
+            setUrl( model.getUrl() );
+            setPackaging( model.getPackaging() );
+            setFile( model.getPomFile() );
+
+            setBuild( new Build()
+            {{
+                setFinalName( model.getArtifactId() );
+                setDirectory( getBasedir() + "/target" );
+                setSourceDirectory( getBasedir() + "/src/main/java" );
+                setOutputDirectory( getBasedir() + "/target/classes" );
+                setTestSourceDirectory( getBasedir() + "/src/test/java" );
+                setTestOutputDirectory( getBasedir() + "/target/test-classes" );
+            }} );
+
+            setCompileSourceRoots( Collections.singletonList( getBasedir() + "/src/main/java" ) );
+            setTestCompileSourceRoots( Collections.singletonList( getBasedir() + "/src/test/java" ) );
+        }
+
+        @Override
+        public File getBasedir()
+        {
+            return pomFile.getParentFile();
+        }
+    }
+}