test: add maven toolchain integration test

Author: vpa1977

rockcraft-maven/src/it/toolchain-test/foo/Foo.java

@@ -0,0 +1,7 @@
+package foo;
+
+public class Foo {
+    public static void main(String[] args) {
+        System.out.println("Hello from Foo!");
+    }
+}

rockcraft-maven/src/it/toolchain-test/invoker.properties

@@ -0,0 +1,2 @@
+invoker.goals=clean package
+invoker.toolchain=toolchains.xml

rockcraft-maven/src/it/toolchain-test/pom.xml

@@ -0,0 +1,24 @@
+<project>
+    <groupId>foo</groupId>
+    <artifactId>toolchain-test</artifactId>
+    <version>1</version>
+    <modelVersion>4.0.0</modelVersion>
+    <build>
+        <directory>${project.basedir}/target</directory>
+        <outputDirectory>${project.basedir}/target/classes</outputDirectory>
+        <testOutputDirectory>${project.basedir}/target/test-classes</testOutputDirectory>
+        <plugins>
+            <plugin>
+                <groupId>io.github.rockcrafters</groupId>
+                <artifactId>rockcraft-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>create-rock</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

rockcraft-maven/src/it/toolchain-test/toolchains.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<toolchains xmlns="http://maven.apache.org/TOOLCHAINS/1.1.0"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xsi:schemaLocation="http://maven.apache.org/TOOLCHAINS/1.1.0 http://maven.apache.org/xsd/toolchains-1.1.0.xsd">
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>17</version>
+        </provides>
+        <configuration>
+            <jdkHome>${env.JAVA_HOME}</jdkHome>
+        </configuration>
+    </toolchain>
+</toolchains>

rockcraft-maven/src/it/toolchain-test/verify.bsh

@@ -0,0 +1,37 @@
+import java.io.*;
+import org.yaml.snakeyaml.Yaml;
+
+File target = new File( basedir, "target" );
+
+// Check that rockcraft.yaml was generated
+var files = target.listFiles(new FilenameFilter(){
+    public boolean accept(File dir, String name) {
+        return name.equals("rockcraft.yaml");
+    }
+});
+
+if ( files == null || files.length == 0 )
+{
+    throw new FileNotFoundException( "Could not find generated rockcraft.yaml file in " + target.getAbsolutePath() );
+}
+
+File rockcraftYaml = files[0];
+
+// Parse the YAML file
+Yaml yaml = new Yaml();
+FileInputStream inputStream = new FileInputStream(rockcraftYaml);
+Map<String, Object> obj = yaml.load(inputStream);
+inputStream.close();
+
+// Verify that build-packages contains the toolchain-detected JDK package
+// The Toolchain class should detect the JDK from toolchains.xml
+List<String> buildPackages = (List<String>) obj.get("build-packages");
+
+if (buildPackages == null) {
+    throw new RuntimeException("build-packages not found in rockcraft.yaml");
+}
+
+String packageName = buildPackages.get(0);
+if (!"openjdk-17-jdk".equals(packageName )) {
+    throw new RuntimeException("Expected openjdk-17-jdk, but got " + packageName);
+}